cytochrome b5 reductase 2, isoform CRA_d [Homo sapiens]
Protein Classification
cytochrome b5 reductase family protein( domain architecture ID 10153046)
cytochrome b5 reductase family protein such as NADH-cytochrome b5 reductase that catalyzes the reduction of 2 molecules of cytochrome b5 using NADH as an electron donor; the cytochrome b5/NADH cytochrome b5 reductase electron transfer system supports the catalytic activity of several sterol biosynthetic enzymes
List of domain hits
| Name | Accession | Description | Interval | E-value | |||||
| cyt_b5_reduct_like | cd06183 | Cytochrome b5 reductase catalyzes the reduction of 2 molecules of cytochrome b5 using NADH as ... |
80-336 | 4.23e-123 | |||||
Cytochrome b5 reductase catalyzes the reduction of 2 molecules of cytochrome b5 using NADH as an electron donor. Like ferredoxin reductases, these proteins have an N-terminal FAD binding subdomain and a C-terminal NADH binding subdomain, separated by a cleft, which accepts FAD. The NADH-binding moiety interacts with part of the FAD and resembles a Rossmann fold. However, NAD is bound differently than in canonical Rossmann fold proteins. Nitrate reductases, flavoproteins similar to pyridine nucleotide cytochrome reductases, catalyze the reduction of nitrate to nitrite. The enzyme can be divided into three functional fragments that bind the cofactors molybdopterin, heme-iron, and FAD/NADH. : Pssm-ID: 99780 [Multi-domain] Cd Length: 234 Bit Score: 353.02 E-value: 4.23e-123
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| Name | Accession | Description | Interval | E-value | |||||
| cyt_b5_reduct_like | cd06183 | Cytochrome b5 reductase catalyzes the reduction of 2 molecules of cytochrome b5 using NADH as ... |
80-336 | 4.23e-123 | |||||
Cytochrome b5 reductase catalyzes the reduction of 2 molecules of cytochrome b5 using NADH as an electron donor. Like ferredoxin reductases, these proteins have an N-terminal FAD binding subdomain and a C-terminal NADH binding subdomain, separated by a cleft, which accepts FAD. The NADH-binding moiety interacts with part of the FAD and resembles a Rossmann fold. However, NAD is bound differently than in canonical Rossmann fold proteins. Nitrate reductases, flavoproteins similar to pyridine nucleotide cytochrome reductases, catalyze the reduction of nitrate to nitrite. The enzyme can be divided into three functional fragments that bind the cofactors molybdopterin, heme-iron, and FAD/NADH. Pssm-ID: 99780 [Multi-domain] Cd Length: 234 Bit Score: 353.02 E-value: 4.23e-123
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| PLN02252 | PLN02252 | nitrate reductase [NADPH] |
68-336 | 4.57e-122 | |||||
nitrate reductase [NADPH] Pssm-ID: 215141 [Multi-domain] Cd Length: 888 Bit Score: 371.70 E-value: 4.57e-122
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| FAD_binding_6 | pfam00970 | Oxidoreductase FAD-binding domain; |
79-186 | 1.30e-48 | |||||
Oxidoreductase FAD-binding domain; Pssm-ID: 425968 [Multi-domain] Cd Length: 99 Bit Score: 158.13 E-value: 1.30e-48
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| Fpr | COG1018 | Flavodoxin/ferredoxin--NADP reductase [Energy production and conversion]; |
78-335 | 4.24e-39 | |||||
Flavodoxin/ferredoxin--NADP reductase [Energy production and conversion]; Pssm-ID: 440641 [Multi-domain] Cd Length: 231 Bit Score: 138.00 E-value: 4.24e-39
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| Name | Accession | Description | Interval | E-value | |||||
| cyt_b5_reduct_like | cd06183 | Cytochrome b5 reductase catalyzes the reduction of 2 molecules of cytochrome b5 using NADH as ... |
80-336 | 4.23e-123 | |||||
Cytochrome b5 reductase catalyzes the reduction of 2 molecules of cytochrome b5 using NADH as an electron donor. Like ferredoxin reductases, these proteins have an N-terminal FAD binding subdomain and a C-terminal NADH binding subdomain, separated by a cleft, which accepts FAD. The NADH-binding moiety interacts with part of the FAD and resembles a Rossmann fold. However, NAD is bound differently than in canonical Rossmann fold proteins. Nitrate reductases, flavoproteins similar to pyridine nucleotide cytochrome reductases, catalyze the reduction of nitrate to nitrite. The enzyme can be divided into three functional fragments that bind the cofactors molybdopterin, heme-iron, and FAD/NADH. Pssm-ID: 99780 [Multi-domain] Cd Length: 234 Bit Score: 353.02 E-value: 4.23e-123
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| PLN02252 | PLN02252 | nitrate reductase [NADPH] |
68-336 | 4.57e-122 | |||||
nitrate reductase [NADPH] Pssm-ID: 215141 [Multi-domain] Cd Length: 888 Bit Score: 371.70 E-value: 4.57e-122
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| PTZ00319 | PTZ00319 | NADH-cytochrome B5 reductase; Provisional |
65-336 | 1.13e-111 | |||||
NADH-cytochrome B5 reductase; Provisional Pssm-ID: 173521 [Multi-domain] Cd Length: 300 Bit Score: 326.40 E-value: 1.13e-111
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| FAD_binding_6 | pfam00970 | Oxidoreductase FAD-binding domain; |
79-186 | 1.30e-48 | |||||
Oxidoreductase FAD-binding domain; Pssm-ID: 425968 [Multi-domain] Cd Length: 99 Bit Score: 158.13 E-value: 1.30e-48
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| FNR_like | cd00322 | Ferredoxin reductase (FNR), an FAD and NAD(P) binding protein, was intially identified as a ... |
83-335 | 3.61e-45 | |||||
Ferredoxin reductase (FNR), an FAD and NAD(P) binding protein, was intially identified as a chloroplast reductase activity, catalyzing the electron transfer from reduced iron-sulfur protein ferredoxin to NADP+ as the final step in the electron transport mechanism of photosystem I. FNR transfers electrons from reduced ferredoxin to FAD (forming FADH2 via a semiquinone intermediate) and then transfers a hydride ion to convert NADP+ to NADPH. FNR has since been shown to utilize a variety of electron acceptors and donors and has a variety of physiological functions including nitrogen assimilation, dinitrogen fixation, steroid hydroxylation, fatty acid metabolism, oxygenase activity, and methane assimilation in many organisms. FNR has an NAD(P)-binding sub-domain of the alpha/beta class and a discrete (usually N-terminal) flavin sub-domain which vary in orientation with respect to the NAD(P) binding domain. The N-terminal moeity may contain a flavin prosthetic group (as in flavoenzymes) or use flavin as a substrate. Because flavins such as FAD can exist in oxidized, semiquinone (one- electron reduced), or fully reduced hydroquinone forms, FNR can interact with one and 2 electron carriers. FNR has a strong preference for NADP(H) vs NAD(H). Pssm-ID: 99778 [Multi-domain] Cd Length: 223 Bit Score: 153.76 E-value: 3.61e-45
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| NAD_binding_1 | pfam00175 | Oxidoreductase NAD-binding domain; Xanthine dehydrogenases, that also bind FAD/NAD, have ... |
212-320 | 3.83e-42 | |||||
Oxidoreductase NAD-binding domain; Xanthine dehydrogenases, that also bind FAD/NAD, have essentially no similarity. Pssm-ID: 425503 [Multi-domain] Cd Length: 109 Bit Score: 142.01 E-value: 3.83e-42
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| PTZ00274 | PTZ00274 | cytochrome b5 reductase; Provisional |
63-319 | 2.56e-41 | |||||
cytochrome b5 reductase; Provisional Pssm-ID: 140300 Cd Length: 325 Bit Score: 146.60 E-value: 2.56e-41
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| Fpr | COG1018 | Flavodoxin/ferredoxin--NADP reductase [Energy production and conversion]; |
78-335 | 4.24e-39 | |||||
Flavodoxin/ferredoxin--NADP reductase [Energy production and conversion]; Pssm-ID: 440641 [Multi-domain] Cd Length: 231 Bit Score: 138.00 E-value: 4.24e-39
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| FNR_iron_sulfur_binding_3 | cd06217 | Iron-sulfur binding ferredoxin reductase (FNR) proteins combine the FAD and NAD(P) binding ... |
90-335 | 2.22e-36 | |||||
Iron-sulfur binding ferredoxin reductase (FNR) proteins combine the FAD and NAD(P) binding regions of FNR with an iron-sulfur binding cluster domain. Ferredoxin-NADP+ (oxido)reductase is an FAD-containing enzyme that catalyzes the reversible electron transfer between NADP(H) and electron carrier proteins such as ferredoxin and flavodoxin. Isoforms of these flavoproteins (i.e. having a non-covalently bound FAD as a prosthetic group) are present in chloroplasts, mitochondria, and bacteria in which they participate in a wide variety of redox metabolic pathways. The C-terminal domain contains most of the NADP(H) binding residues and the N-terminal domain interacts non-covalently with the isoalloxazine rings of the flavin molecule which lies largely in a large gap between the two domains. Ferredoxin-NADP+ reductase first accepts one electron from reduced ferredoxin to form a flavin semiquinone intermediate. The enzyme then accepts a second electron to form FADH2 which then transfers two electrons and a proton to NADP+ to form NADPH. Pssm-ID: 99813 [Multi-domain] Cd Length: 235 Bit Score: 131.23 E-value: 2.22e-36
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| Mcr1 | COG0543 | NAD(P)H-flavin reductase [Coenzyme transport and metabolism, Energy production and conversion]; ... |
83-334 | 4.39e-31 | |||||
NAD(P)H-flavin reductase [Coenzyme transport and metabolism, Energy production and conversion]; Pssm-ID: 440309 [Multi-domain] Cd Length: 247 Bit Score: 117.27 E-value: 4.39e-31
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| sulfite_reductase_like | cd06221 | Anaerobic sulfite reductase contains an FAD and NADPH binding module with structural ... |
131-335 | 2.42e-30 | |||||
Anaerobic sulfite reductase contains an FAD and NADPH binding module with structural similarity to ferredoxin reductase and sequence similarity to dihydroorotate dehydrogenases. Clostridium pasteurianum inducible dissimilatory type sulfite reductase is linked to ferredoxin and reduces NH2OH and SeO3 at a lesser rate than it's normal substate SO3(2-). Dihydroorotate dehydrogenases (DHODs) catalyze the only redox reaction in pyrimidine de novo biosynthesis. They catalyze the oxidation of (S)-dihydroorotate to orotate coupled with the reduction of NAD+. Pssm-ID: 99817 [Multi-domain] Cd Length: 253 Bit Score: 115.78 E-value: 2.42e-30
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| PTZ00306 | PTZ00306 | NADH-dependent fumarate reductase; Provisional |
92-335 | 2.85e-29 | |||||
NADH-dependent fumarate reductase; Provisional Pssm-ID: 140327 [Multi-domain] Cd Length: 1167 Bit Score: 118.73 E-value: 2.85e-29
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| FNR_iron_sulfur_binding_1 | cd06215 | Iron-sulfur binding ferredoxin reductase (FNR) proteins combine the FAD and NAD(P) binding ... |
80-335 | 4.54e-28 | |||||
Iron-sulfur binding ferredoxin reductase (FNR) proteins combine the FAD and NAD(P) binding regions of FNR with an iron-sulfur binding cluster domain. Ferredoxin-NADP+ (oxido)reductase is an FAD-containing enzyme that catalyzes the reversible electron transfer between NADP(H) and electron carrier proteins such as ferredoxin and flavodoxin. Isoforms of these flavoproteins (i.e. having a non-covalently bound FAD as a prosthetic group) are present in chloroplasts, mitochondria, and bacteria in which they participate in a wide variety of redox metabolic pathways. The C-terminal portion of the FAD/NAD binding domain contains most of the NADP(H) binding residues and the N-terminal sub-domain interacts non-covalently with the isoalloxazine rings of the flavin molecule which lies largely in a large gap betweed the two domains. In this ferredoxin like sub-group, the FAD/NAD sub-domains is typically fused to a C-terminal iron-sulfur binding domain. Iron-sulfur proteins play an important role in electron transfer processes and in various enzymatic reactions. The family includes plant and algal ferredoxins which act as electron carriers in photosynthesis and ferredoxins which participate in redox chains from bacteria to mammals. Ferredoxin reductase first accepts one electron from reduced ferredoxin to form a flavin semiquinone intermediate. The enzyme then accepts a second electron to form FADH2 which then transfers two electrons and a proton to NADP+ to form NADPH. Pssm-ID: 99811 [Multi-domain] Cd Length: 231 Bit Score: 108.83 E-value: 4.54e-28
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| PA_degradation_oxidoreductase_like | cd06214 | NAD(P) binding domain of ferredoxin reductase like phenylacetic acid (PA) degradation ... |
78-327 | 3.09e-27 | |||||
NAD(P) binding domain of ferredoxin reductase like phenylacetic acid (PA) degradation oxidoreductase. PA oxidoreductases of E. coli hydroxylate PA-CoA in the second step of PA degradation. Members of this group typically fuse a ferredoxin reductase-like domain with an iron-sulfur binding cluster domain. Ferredoxins catalyze electron transfer between an NAD(P)-binding domain of the alpha/beta class and a discrete (usually N-terminal) domain which vary in orientation with respect to the NAD(P) binding domain. The N-terminal portion may contain a flavin prosthetic group, as in flavoenzymes, or use flavin as a substrate. Ferredoxin-NADP+ (oxido)reductase is an FAD-containing enzyme that catalyzes the reversible electron transfer between NADP(H) and electron carrier proteins such as ferredoxin and flavodoxin. Isoforms of these flavoproteins (i.e. having a non-covalently bound FAD as a prosthetic group) are present in chloroplasts, mitochondria, and bacteria and participate in a wide variety of redox metabolic pathways. The C-terminal domain contains most of the NADP(H) binding residues and the N-terminal domain interacts non-covalently with the isoalloxazine rings of the flavin molecule which lies largely in a large gap betweed the two domains. Ferredoxin-NADP+ reductase first accepts one electron from reduced ferredoxin to form a flavin semiquinone intermediate. The enzyme then accepts a second electron to form FADH2 which then transfers two electrons and a proton to NADP+ to form NADPH. Pssm-ID: 99810 [Multi-domain] Cd Length: 241 Bit Score: 106.86 E-value: 3.09e-27
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| FNR_iron_sulfur_binding_2 | cd06216 | Iron-sulfur binding ferredoxin reductase (FNR) proteins combine the FAD and NAD(P) binding ... |
111-318 | 5.64e-24 | |||||
Iron-sulfur binding ferredoxin reductase (FNR) proteins combine the FAD and NAD(P) binding regions of FNR with an iron-sulfur binding cluster domain. Ferredoxin-NADP+ (oxido)reductase is an FAD-containing enzyme that catalyzes the reversible electron transfer between NADP(H) and electron carrier proteins such as ferredoxin and flavodoxin. Isoforms of these flavoproteins (i.e. having a non-covalently bound FAD as a prosthetic group) are present in chloroplasts, mitochondria, and bacteria in which they participate in a wide variety of redox metabolic pathways. The C-terminal domain contains most of the NADP(H) binding residues and the N-terminal domain interacts non-covalently with the isoalloxazine rings of the flavin molecule which lies largely in a large gap betweed the two domains. Ferredoxin-NADP+ reductase first accepts one electron from reduced ferredoxin to form a flavin semiquinone intermediate. The enzyme then accepts a second electron to form FADH2 which then transfers two electrons and a proton to NADP+ to form NADPH. Pssm-ID: 99812 [Multi-domain] Cd Length: 243 Bit Score: 98.45 E-value: 5.64e-24
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| phenol_2-monooxygenase_like | cd06211 | Phenol 2-monooxygenase (phenol hydroxylase) is a flavoprotein monooxygenase, able to use ... |
82-335 | 3.04e-23 | |||||
Phenol 2-monooxygenase (phenol hydroxylase) is a flavoprotein monooxygenase, able to use molecular oxygen as a substrate in the microbial degredation of phenol. This protein is encoded by a single gene and uses a tightly bound FAD cofactor in the NAD(P)H dependent conversion of phenol and O2 to catechol and H2O. This group is related to the NAD binding ferredoxin reductases. Pssm-ID: 99807 Cd Length: 238 Bit Score: 96.24 E-value: 3.04e-23
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| COG4097 | COG4097 | Predicted ferric reductase [Inorganic ion transport and metabolism]; |
129-327 | 2.11e-22 | |||||
Predicted ferric reductase [Inorganic ion transport and metabolism]; Pssm-ID: 443273 [Multi-domain] Cd Length: 442 Bit Score: 97.27 E-value: 2.11e-22
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| FNR_like_1 | cd06196 | Ferredoxin reductase-like proteins catalyze electron transfer between an NAD(P)-binding domain ... |
78-335 | 6.87e-22 | |||||
Ferredoxin reductase-like proteins catalyze electron transfer between an NAD(P)-binding domain of the alpha/beta class and a discrete (usually N-terminal) domain which varies in orientation with respect to the NAD(P) binding domain. The N-terminal region may contain a flavin prosthetic group (as in flavoenzymes) or use flavin as a substrate. Ferredoxin is reduced in the final stage of photosystem I. The flavoprotein Ferredoxin-NADP+ reductase transfers electrons from reduced ferredoxin to FAD (forming FADH2 via a semiquinone intermediate) which then transfers a hydride ion to convert NADP+ to NADPH. Pssm-ID: 99793 [Multi-domain] Cd Length: 218 Bit Score: 91.92 E-value: 6.87e-22
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| MMO_FAD_NAD_binding | cd06210 | Methane monooxygenase (MMO) reductase of methanotrophs catalyzes the NADH-dependent ... |
86-318 | 8.93e-22 | |||||
Methane monooxygenase (MMO) reductase of methanotrophs catalyzes the NADH-dependent hydroxylation of methane to methanol. This multicomponent enzyme mediates electron transfer via a hydroxylase (MMOH), a coupling protein, and a reductase which is comprised of an N-terminal [2Fe-2S] ferredoxin domain, an FAD binding subdomain, and an NADH binding subdomain. Oxygenases oxidize hydrocarbons using dioxygen as the oxidant. Dioxygenases add both atom of oxygen to the substrate, while mono-oxygenases add one atom to the substrate and one atom to water. Pssm-ID: 99806 Cd Length: 236 Bit Score: 92.02 E-value: 8.93e-22
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| BenDO_FAD_NAD | cd06209 | Benzoate dioxygenase reductase (BenDO) FAD/NAD binding domain. Oxygenases oxidize hydrocarbons ... |
86-334 | 1.82e-21 | |||||
Benzoate dioxygenase reductase (BenDO) FAD/NAD binding domain. Oxygenases oxidize hydrocarbons using dioxygen as the oxidant. As a Class I bacterial dioxygenases, benzoate dioxygenase like proteins combine an [2Fe-2S] cluster containing N-terminal ferredoxin at the end fused to an FAD/NADP(P) domain. In dioxygenase FAD/NAD(P) binding domain, the reductase transfers 2 electrons from NAD(P)H to the oxygenase which insert into an aromatic substrate, an initial step in microbial aerobic degradation of aromatic rings. Flavin oxidoreductases use flavins as substrates, unlike flavoenzymes which have a flavin prosthetic group. Pssm-ID: 99805 [Multi-domain] Cd Length: 228 Bit Score: 91.12 E-value: 1.82e-21
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| T4MO_e_transfer_like | cd06190 | Toluene-4-monoxygenase electron transfer component of Pseudomonas mendocina hydroxylates ... |
82-316 | 2.73e-21 | |||||
Toluene-4-monoxygenase electron transfer component of Pseudomonas mendocina hydroxylates toluene and forms p-cresol as part of a three component toluene-4-monoxygenase system. Electron transfer is from NADH to an NADH:ferredoxin oxidoreductase (TmoF in P. mendocina) to ferredoxin to an iron-containing oxygenase. TmoF is homologous to other mono- and dioxygenase systems within the ferredoxin reductase family. Pssm-ID: 99787 Cd Length: 232 Bit Score: 90.78 E-value: 2.73e-21
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| O2ase_reductase_like | cd06187 | The oxygenase reductase FAD/NADH binding domain acts as part of the multi-component bacterial ... |
83-335 | 4.57e-21 | |||||
The oxygenase reductase FAD/NADH binding domain acts as part of the multi-component bacterial oxygenases which oxidize hydrocarbons using oxygen as the oxidant. Electron transfer is from NADH via FAD (in the oxygenase reductase) and an [2FE-2S] ferredoxin center (fused to the FAD/NADH domain and/or discrete) to the oxygenase. Dioxygenases add both atoms of oxygen to the substrate, while mono-oxygenases (aka mixed oxygenases) add one atom to the substrate and one atom to water. In dioxygenases, Class I enzymes are 2 component, containing a reductase with Rieske type [2Fe-2S] redox centers and an oxygenase. Class II are 3 component, having discrete flavin and ferredoxin proteins and an oxygenase. Class III have 2 [2Fe-2S] centers, one fused to the flavin domain and the other separate. Pssm-ID: 99784 [Multi-domain] Cd Length: 224 Bit Score: 89.96 E-value: 4.57e-21
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| monooxygenase_like | cd06212 | The oxygenase reductase FAD/NADH binding domain acts as part of the multi-component bacterial ... |
86-334 | 1.19e-20 | |||||
The oxygenase reductase FAD/NADH binding domain acts as part of the multi-component bacterial oxygenases which oxidize hydrocarbons. These flavoprotein monooxygenases use molecular oxygen as a substrate and require reduced FAD. One atom of oxygen is incorportated into the aromatic compond, while the other is used to form a molecule of water. In contrast dioxygenases add both atoms of oxygen to the substrate. Pssm-ID: 99808 [Multi-domain] Cd Length: 232 Bit Score: 88.93 E-value: 1.19e-20
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| NqrF | COG2871 | Na+-transporting NADH:ubiquinone oxidoreductase, subunit NqrF [Energy production and ... |
82-335 | 2.11e-20 | |||||
Na+-transporting NADH:ubiquinone oxidoreductase, subunit NqrF [Energy production and conversion]; Na+-transporting NADH:ubiquinone oxidoreductase, subunit NqrF is part of the Pathway/BioSystem: Na+-translocating NADH dehydrogenase Pssm-ID: 442118 [Multi-domain] Cd Length: 396 Bit Score: 91.08 E-value: 2.11e-20
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| FNR_iron_sulfur_binding | cd06191 | Iron-sulfur binding Ferredoxin Reductase (FNR) proteins combine the FAD and NAD(P) binding ... |
80-335 | 1.37e-17 | |||||
Iron-sulfur binding Ferredoxin Reductase (FNR) proteins combine the FAD and NAD(P) binding regions of FNR with a C-terminal iron-sulfur binding cluster domain. FNR was intially identified as a chloroplast reductase activity catalyzing the electron transfer from reduced iron-sulfur protein ferredoxin to NADP+ as the final step in the electron transport mechanism of photosystem I. FNR transfers electrons from reduced ferredoxin to FAD (forming FADH2 via a semiquinone intermediate) and then transfers a hydride ion to convert NADP+ to NADPH. FNR has since been shown to utilize a variety of electron acceptors and donors and has a variety of physiological functions including nitrogen assimilation, dinitrogen fixation, steroid hydroxylation, fatty acid metabolism, oxygenase activity, and methnae assimilation in a variety of organisms. FNR has an NAD(P)-binding sub-domain of the alpha/beta class and a discrete (usually N-terminal) flavin sub-domain which vary in orientation with respect to the NAD(P) binding domain. The N-terminal moeity may contain a flavin prosthetic group (as in flavoenzymes) or use flavin as a substrate. Because flavins such as FAD can exist in oxidized, semiquinone (one- electron reduced), or fully reduced hydroquinone forms, FNR can interact with one and 2 electron carriers. FNR has a strong preference for NADP(H) vs NAD(H). Pssm-ID: 99788 [Multi-domain] Cd Length: 231 Bit Score: 80.65 E-value: 1.37e-17
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| flavohem_like_fad_nad_binding | cd06184 | FAD_NAD(P)H binding domain of flavohemoglobin. Flavohemoglobins have a globin domain ... |
158-334 | 1.27e-15 | |||||
FAD_NAD(P)H binding domain of flavohemoglobin. Flavohemoglobins have a globin domain containing a B-type heme fused with a ferredoxin reductase-like FAD/NAD-binding domain. Flavohemoglobins detoxify nitric oxide (NO) via an NO dioxygenase reaction. The hemoglobin domain adopts a globin fold with an embedded heme molecule. Flavohemoglobins also have a C-terminal reductase domain with bindiing sites for FAD and NAD(P)H. This domain catalyzes the conversion of NO + O2 + NAD(P)H to NO3- + NAD(P)+. Instead of the oxygen transport function of hemoglobins, flavohemoglobins seem to act in NO dioxygenation and NO signalling. Pssm-ID: 99781 Cd Length: 247 Bit Score: 75.29 E-value: 1.27e-15
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| flavin_oxioreductase | cd06189 | NAD(P)H dependent flavin oxidoreductases use flavin as a substrate in mediating electron ... |
86-318 | 5.18e-14 | |||||
NAD(P)H dependent flavin oxidoreductases use flavin as a substrate in mediating electron transfer from iron complexes or iron proteins. Structurally similar to ferredoxin reductases, but with only 15% sequence identity, flavin reductases reduce FAD, FMN, or riboflavin via NAD(P)H. Flavin is used as a substrate, rather than a tightly bound prosthetic group as in flavoenzymes; weaker binding is due to the absence of a binding site for the AMP moeity of FAD. Pssm-ID: 99786 [Multi-domain] Cd Length: 224 Bit Score: 70.27 E-value: 5.18e-14
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| NADH_quinone_reductase | cd06188 | Na+-translocating NADH:quinone oxidoreductase (Na+-NQR) FAD/NADH binding domain. (Na+-NQR) ... |
122-334 | 2.02e-13 | |||||
Na+-translocating NADH:quinone oxidoreductase (Na+-NQR) FAD/NADH binding domain. (Na+-NQR) provides a means of storing redox reaction energy via the transmembrane translocation of Na2+ ions. The C-terminal domain resembles ferredoxin:NADP+ oxidoreductase, and has NADH and FAD binding sites. (Na+-NQR) is distinct from H+-translocating NADH:quinone oxidoreductases and noncoupled NADH:quinone oxidoreductases. The NAD(P) binding domain of ferredoxin reductase-like proteins catalyze electron transfer between an NAD(P)-binding domain of the alpha/beta class and a discrete (usually N-terminal) domain which vary in orientation with respect to the NAD(P) binding domain. The N-terminal domain of this group typically contains an iron-sulfur cluster binding domain. Pssm-ID: 99785 [Multi-domain] Cd Length: 283 Bit Score: 69.64 E-value: 2.02e-13
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| FNR1 | cd06195 | Ferredoxin-NADP+ (oxido)reductase is an FAD-containing enzyme that catalyzes the reversible ... |
106-331 | 2.19e-13 | |||||
Ferredoxin-NADP+ (oxido)reductase is an FAD-containing enzyme that catalyzes the reversible electron transfer between NADP(H) and electron carrier proteins such as ferredoxin and flavodoxin. Isoforms of these flavoproteins (i.e. having a non-covalently bound FAD as a prosthetic group) are present in chloroplasts, mitochondria, and bacteria in which they participate in a wide variety of redox metabolic pathways. The C-terminal domain contains most of the NADP(H) binding residues and the N-terminal domain interacts non-covalently with the isoalloxazine rings of the flavin molecule which lies largely in a large gap betweed the two domains. Ferredoxin-NADP+ reductase first accepts one electron from reduced ferredoxin to form a flavin semiquinone intermediate. The enzyme then accepts a second electron to form FADH2 which then transfers two electrons and a proton to NADP+ to form NADPH. Pssm-ID: 99792 [Multi-domain] Cd Length: 241 Bit Score: 68.75 E-value: 2.19e-13
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| DHOD_e_trans | cd06218 | FAD/NAD binding domain in the electron transfer subunit of dihydroorotate dehydrogenase. ... |
83-314 | 6.51e-13 | |||||
FAD/NAD binding domain in the electron transfer subunit of dihydroorotate dehydrogenase. Dihydroorotate dehydrogenases (DHODs) catalyze the only redox reaction in pyrimidine de novo biosynthesis. They catalyze the oxidation of (S)-dihydroorotate to orotate coupled with the reduction of NAD+. In L. lactis, DHOD B (encoded by pyrDa) is co-expressed with pyrK and both gene products are required for full activity, as well as 3 cofactors: FMN, FAD, and an [2Fe-2S] cluster. Pssm-ID: 99814 [Multi-domain] Cd Length: 246 Bit Score: 67.57 E-value: 6.51e-13
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| DHOD_e_trans_like2 | cd06220 | FAD/NAD binding domain in the electron transfer subunit of dihydroorotate dehydrogenase-like ... |
160-314 | 1.71e-12 | |||||
FAD/NAD binding domain in the electron transfer subunit of dihydroorotate dehydrogenase-like proteins. Dihydroorotate dehydrogenases (DHODs) catalyze the only redox reaction in pyrimidine de novo biosynthesis. They catalyze the oxidation of (S)-dihydroorotate to orotate coupled with the reduction of NAD+. In L. lactis, DHOD B (encoded by pyrDa) is co-expressed with pyrK and both gene products are required for full activity, as well as 3 cofactors: FMN, FAD, and an [2Fe-2S] cluster. Pssm-ID: 99816 [Multi-domain] Cd Length: 233 Bit Score: 66.12 E-value: 1.71e-12
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| oxygenase_e_transfer_subunit | cd06213 | The oxygenase reductase FAD/NADH binding domain acts as part of the multi-component bacterial ... |
159-334 | 1.81e-12 | |||||
The oxygenase reductase FAD/NADH binding domain acts as part of the multi-component bacterial oxygenases which oxidize hydrocarbons. Electron transfer is from NADH via FAD (in the oxygenase reductase) and an [2FE-2S] ferredoxin center (fused to the FAD/NADH domain and/or discrete) to the oxygenase. Dioxygenases add both atoms of oxygen to the substrate while mono-oxygenases add one atom to the substrate and one atom to water. In dioxygenases, Class I enzymes are 2 component, containing a reductase with Rieske type [2Fe-2S] redox centers and an oxygenase. Class II are 3 component, having discrete flavin and ferredoxin proteins and an oxygenase. Class III have 2 [2Fe-2S] centers, one fused to the flavin domain and the other separate. Pssm-ID: 99809 Cd Length: 227 Bit Score: 65.80 E-value: 1.81e-12
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| PRK00054 | PRK00054 | dihydroorotate dehydrogenase electron transfer subunit; Reviewed |
131-313 | 2.33e-11 | |||||
dihydroorotate dehydrogenase electron transfer subunit; Reviewed Pssm-ID: 234601 [Multi-domain] Cd Length: 250 Bit Score: 62.97 E-value: 2.33e-11
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| FNR_N-term_Iron_sulfur_binding | cd06194 | Iron-sulfur binding ferredoxin reductase (FNR) proteins combine the FAD and NAD(P) binding ... |
82-315 | 1.47e-10 | |||||
Iron-sulfur binding ferredoxin reductase (FNR) proteins combine the FAD and NAD(P) binding regions of FNR with an N-terminal Iron-Sulfur binding cluster domain. Ferredoxin-NADP+ (oxido)reductase is an FAD-containing enzyme that catalyzes the reversible electron transfer between NADP(H) and electron carrier proteins such as ferredoxin and flavodoxin. Isoforms of these flavoproteins (i.e. having a non-covalently bound FAD as a prosthetic group) are present in chloroplasts, mitochondria, and bacteria in which they participate in a wide variety of redox metabolic pathways. The C-terminal domain contains most of the NADP(H) binding residues and the N-terminal domain interacts non-covalently with the isoalloxazine rings of the flavin molecule which lies largely in a large gap betweed the two domains. Ferredoxin-NADP+ reductase first accepts one electron from reduced ferredoxin to form a flavin semiquinone intermediate. The enzyme then accepts a second electron to form FADH2 which then transfers two electrons and a proton to NADP+ to form NADPH. Pssm-ID: 99791 [Multi-domain] Cd Length: 222 Bit Score: 60.36 E-value: 1.47e-10
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| FNR_like_3 | cd06198 | NAD(P) binding domain of ferredoxin reductase-like proteins catalyze electron transfer ... |
129-317 | 1.52e-10 | |||||
NAD(P) binding domain of ferredoxin reductase-like proteins catalyze electron transfer between an NAD(P)-binding sub-domain of the alpha/beta class and a discrete (usually N-terminal) domain, which varies in orientation with respect to the NAD(P) binding domain. The N-terminal domain may contain a flavin prosthetic group (as in flavoenzymes) or use flavin as a substrate. Ferredoxin is reduced in the final stage of photosystem I. The flavoprotein Ferredoxin-NADP+ reductase transfers electrons from reduced ferredoxin to FAD (forming FADH2 via a semiquinone intermediate) which then transfers a hydride ion to convert NADP+ to NADPH. Pssm-ID: 99795 [Multi-domain] Cd Length: 216 Bit Score: 59.96 E-value: 1.52e-10
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| PRK08345 | PRK08345 | cytochrome-c3 hydrogenase subunit gamma; Provisional |
81-334 | 8.61e-10 | |||||
cytochrome-c3 hydrogenase subunit gamma; Provisional Pssm-ID: 236247 [Multi-domain] Cd Length: 289 Bit Score: 58.66 E-value: 8.61e-10
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| CYPOR_like_FNR | cd06208 | These ferredoxin reductases are related to the NADPH cytochrome p450 reductases (CYPOR), but ... |
118-276 | 8.64e-09 | |||||
These ferredoxin reductases are related to the NADPH cytochrome p450 reductases (CYPOR), but lack the FAD-binding region connecting sub-domain. Ferredoxin-NADP+ reductase (FNR) is an FAD-containing enzyme that catalyzes the reversible electron transfer between NADP(H) and electron carrier proteins, such as ferredoxin and flavodoxin. Isoforms of these flavoproteins (i.e. having a non-covalently bound FAD as a prosthetic group) are present in chloroplasts, mitochondria, and bacteria in which they participate in a wide variety of redox metabolic pathways. The C-terminal domain contains most of the NADP(H) binding residues and the N-terminal domain interacts non-covalently with the isoalloxazine rings of the flavin molecule which lies largely in a large gap between the two domains. Ferredoxin-NADP+ reductase first accepts one electron from reduced ferredoxin to form a flavin semiquinone intermediate. The enzyme then accepts a second electron to form FADH2, which then transfers two electrons and a proton to NADP+ to form NADPH. CYPOR serves as an electron donor in several oxygenase systems and is a component of nitric oxide synthases, sulfite reducatase, and methionine synthase reductases. CYPOR transfers two electrons from NADPH to the heme of cytochrome p450 via FAD and FMN. CYPOR has a C-terminal FNR-like FAD and NAD binding module, an FMN-binding domain, and an additional connecting domain (inserted within the FAD binding region) that orients the FNR and FMN -binding domains. The C-terminal domain contains most of the NADP(H) binding residues, and the N-terminal domain interacts non-covalently with the isoalloxazine rings of the flavin molecule, which lies largely in a large gap betweed the two domains. Ferredoxin-NADP+ reductase first accepts one electron from reduced ferredoxin to form a flavin semiquinone intermediate. The enzyme then accepts a second electron to form FADH2 which then transfers two electrons and a proton to NADP+ to form NADPH. Pssm-ID: 99804 [Multi-domain] Cd Length: 286 Bit Score: 55.79 E-value: 8.64e-09
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| PRK07609 | PRK07609 | CDP-6-deoxy-delta-3,4-glucoseen reductase; Validated |
77-266 | 5.37e-08 | |||||
CDP-6-deoxy-delta-3,4-glucoseen reductase; Validated Pssm-ID: 181058 [Multi-domain] Cd Length: 339 Bit Score: 53.72 E-value: 5.37e-08
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| PRK10684 | PRK10684 | HCP oxidoreductase, NADH-dependent; Provisional |
117-335 | 2.15e-07 | |||||
HCP oxidoreductase, NADH-dependent; Provisional Pssm-ID: 236735 [Multi-domain] Cd Length: 332 Bit Score: 51.63 E-value: 2.15e-07
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| DHOD_e_trans_like | cd06192 | FAD/NAD binding domain (electron transfer subunit) of dihydroorotate dehydrogenase-like ... |
82-314 | 5.35e-07 | |||||
FAD/NAD binding domain (electron transfer subunit) of dihydroorotate dehydrogenase-like proteins. Dihydroorotate dehydrogenases (DHODs) catalyze the only redox reaction in pyrimidine de novo biosynthesis. They catalyze the oxidation of (S)-dihydroorotate to orotate coupled with the reduction of NAD+. In L. lactis, DHOD B (encoded by pyrDa) is co-expressed with pyrK and both gene products are required for full activity, as well as NAD binding. NAD(P) binding domain of ferredoxin reductase-like proteins catalyze electron transfer between an NAD(P)-binding domain of the alpha/beta class and a discrete (usually N-terminal) domain which vary in orientation with respect to the NAD(P) binding domain. The N-terminal domain may contain a flavin prosthetic group (as in flavoenzymes) or use flavin as a substrate. Ferredoxin is reduced in the final stage of photosystem I. The flavoprotein Ferredoxin-NADP+ reductase transfers electrons from reduced ferredoxin to FAD (forming FADH2 via a semiquinone intermediate) which then transfers a hydride ion to convert NADP+ to NADPH. Pssm-ID: 99789 [Multi-domain] Cd Length: 243 Bit Score: 50.02 E-value: 5.35e-07
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| antC | PRK11872 | anthranilate 1,2-dioxygenase electron transfer component AntC; |
159-316 | 2.08e-06 | |||||
anthranilate 1,2-dioxygenase electron transfer component AntC; Pssm-ID: 183350 [Multi-domain] Cd Length: 340 Bit Score: 48.97 E-value: 2.08e-06
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| SiR_like2 | cd06201 | Cytochrome p450- like alpha subunits of E. coli sulfite reductase (SiR) multimerize with beta ... |
75-265 | 4.33e-06 | |||||
Cytochrome p450- like alpha subunits of E. coli sulfite reductase (SiR) multimerize with beta subunits to catalyze the NADPH dependent reduction of sulfite to sulfide. Beta subunits have an Fe4S4 cluster and a siroheme, while the alpha subunits (cysJ gene) are of the cytochrome p450 (CyPor) family having FAD and FMN as prosthetic groups and utilizing NADPH. Cypor (including cyt -450 reductase, nitric oxide synthase, and methionine synthase reductase) are ferredoxin reductase (FNR)-like proteins with an additional N-terminal FMN domain and a connecting sub-domain inserted within the flavin binding portion of the FNR-like domain. The connecting domain orients the N-terminal FMN domain with the C-terminal FNR domain. NADPH cytochrome p450 reductase (CYPOR) serves as an electron donor in several oxygenase systems and is a component of nitric oxide synthases and methionine synthase reductases. CYPOR transfers two electrons from NADPH to the heme of cytochrome p450 via FAD and FMN. Ferredoxin-NADP+ (oxido)reductase is an FAD-containing enzyme that catalyzes the reversible electron transfer between NADP(H) and electron carrier proteins such as ferredoxin and flavodoxin. Isoforms of these flavoproteins (i.e. having a non-covalently bound FAD as a prosthetic group) are present in chloroplasts, mitochondria, and bacteria in which they participate in a wide variety of redox metabolic pathways. The C-terminal domain contains most of the NADP(H) binding residues and the N-terminal domain interacts non-covalently with the isoalloxazine rings of the flavin molecule which lies largely in a large gap betweed the two domains. Ferredoxin-NADP+ reductase first accepts one electron from reduced ferredoxin to form a flavin semiquinone intermediate. The enzyme then accepts a second electron to form FADH2 which then transfers two electrons and a proton to NADP+ to form NADPH. Pssm-ID: 99798 [Multi-domain] Cd Length: 289 Bit Score: 47.71 E-value: 4.33e-06
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| FNR_like_2 | cd06197 | FAD/NAD(P) binding domain of ferredoxin reductase-like proteins. Ferredoxin reductase (FNR) ... |
83-258 | 3.56e-05 | |||||
FAD/NAD(P) binding domain of ferredoxin reductase-like proteins. Ferredoxin reductase (FNR) was intially identified as a chloroplast reductase activity, catalyzing the electron transfer from reduced iron-sulfur protein ferredoxin to NADP+ as the final step in the electron transport mechanism of photosystem I. FNR transfers electrons from reduced ferredoxin to FAD (forming FADH2 via a semiquinone intermediate) and then transfers a hydride ion to convert NADP+ to NADPH. FNR has since been shown to utilize a variety of electron acceptors and donors and have a variety of physiological functions in a variety of organisms including nitrogen assimilation, dinitrogen fixation, steroid hydroxylation, fatty acid metabolism, oxygenase activity, and methane assimilation. FNR has an NAD(P)-binding sub-domain of the alpha/beta class and a discrete (usually N-terminal) flavin sub-domain which varies in orientation with respect to the NAD(P) binding domain. The N-terminal moeity may contain a flavin prosthetic group (as in flavoenzymes) or use flavin as a substrate. Because flavins such as FAD can exist in oxidized, semiquinone (one-electron reduced), or fully reduced hydroquinone forms, FNR can interact with one and two electron carriers. FNR has a strong preference for NADP(H) vs NAD(H). Pssm-ID: 99794 Cd Length: 220 Bit Score: 44.30 E-value: 3.56e-05
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| NOX_Duox_like_FAD_NADP | cd06186 | NADPH oxidase (NOX) catalyzes the generation of reactive oxygen species (ROS) such as ... |
129-264 | 1.33e-04 | |||||
NADPH oxidase (NOX) catalyzes the generation of reactive oxygen species (ROS) such as superoxide and hydrogen peroxide. ROS were originally identified as bactericidal agents in phagocytes, but are now also implicated in cell signaling and metabolism. NOX has a 6-alpha helix heme-binding transmembrane domain fused to a flavoprotein with the nucleotide binding domain located in the cytoplasm. Duox enzymes link a peroxidase domain to the NOX domain via a single transmembrane and EF-hand Ca2+ binding sites. The flavoprotein module has a ferredoxin like FAD/NADPH binding domain. In classical phagocytic NOX2, electron transfer occurs from NADPH to FAD to the heme of cytb to oxygen leading to superoxide formation. Pssm-ID: 99783 [Multi-domain] Cd Length: 210 Bit Score: 42.29 E-value: 1.33e-04
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| PLN02844 | PLN02844 | oxidoreductase/ferric-chelate reductase |
208-251 | 1.34e-04 | |||||
oxidoreductase/ferric-chelate reductase Pssm-ID: 215453 [Multi-domain] Cd Length: 722 Bit Score: 43.68 E-value: 1.34e-04
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| NAD_binding_6 | pfam08030 | Ferric reductase NAD binding domain; |
208-320 | 3.05e-04 | |||||
Ferric reductase NAD binding domain; Pssm-ID: 429792 [Multi-domain] Cd Length: 149 Bit Score: 40.40 E-value: 3.05e-04
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| PRK05802 | PRK05802 | sulfide/dihydroorotate dehydrogenase-like FAD/NAD-binding protein; |
130-228 | 4.06e-04 | |||||
sulfide/dihydroorotate dehydrogenase-like FAD/NAD-binding protein; Pssm-ID: 235613 [Multi-domain] Cd Length: 320 Bit Score: 41.50 E-value: 4.06e-04
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| PDR_like | cd06185 | Phthalate dioxygenase reductase (PDR) is an FMN-dependent reductase that mediates electron ... |
167-318 | 4.43e-03 | |||||
Phthalate dioxygenase reductase (PDR) is an FMN-dependent reductase that mediates electron transfer from NADH to FMN to an iron sulfur cluster. PDR has an an N-terminal ferrredoxin reductase (FNR)-like NAD(H) binding domain and a C-terminal iron-sulfur [2Fe-2S] cluster domain. Although structurally homologous to FNR, PDR binds FMN rather than FAD in it's FNR-like domain. Electron transfer between pyrimidines and iron-sulfur clusters (Rieske center [2Fe-2S]) or heme groups is mediated by flavins in respiration, photosynthesis, and oxygenase systems. Type I dioxygenase systems, including the hydroxylate phthalate system, have 2 components, a monomeric reductase consisting of a flavin and a 2Fe-2S center and a multimeric oxygenase. In contrast to other Rieske dioxygenases the ferredoxin like domain is C-, not N-terminal. Pssm-ID: 99782 [Multi-domain] Cd Length: 211 Bit Score: 37.85 E-value: 4.43e-03
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| siderophore_interacting | cd06193 | Siderophore interacting proteins share the domain structure of the ferredoxin reductase like ... |
94-187 | 5.83e-03 | |||||
Siderophore interacting proteins share the domain structure of the ferredoxin reductase like family. Siderophores are produced in various bacteria (and some plants) to extract iron from hosts. Binding constants are high, so iron can be pilfered from transferrin and lactoferrin for bacterial uptake, contributing to pathogen virulence. Ferredoxin reductase (FNR), an FAD and NAD(P) binding protein, was intially identified as a chloroplast reductase activity, catalyzing the electron transfer from reduced iron-sulfur protein ferredoxin to NADP+ as the final step in the electron transport mechanism of photosystem I. FNR transfers electrons from reduced ferredoxin to FAD (forming FADH2 via a semiquinone intermediate) and then transfers a hydride ion to convert NADP+ to NADPH. FNR has since been shown to utilize a variety of electron acceptors and donors and has a variety of physiological functions including nitrogen assimilation, dinitrogen fixation, steroid hydroxylation, fatty acid metabolism, oxygenase activity, and methane assimilation in a variety of organisms. FNR has an NAD(P)-binding sub-domain of the alpha/beta class and a discrete (usually N-terminal) flavin sub-domain which vary in orientation with respect to the NAD(P) binding domain. The N-terminal moeity may contain a flavin prosthetic group (as in flavoenzymes) or use flavin as a substrate. Because flavins such as FAD can exist in oxidized, semiquinone (one-electron reduced), or fully reduced hydroquinone forms, FNR can interact with one and two electron carriers. FNR has a strong preference for NADP(H) vs NAD(H). Pssm-ID: 99790 [Multi-domain] Cd Length: 235 Bit Score: 37.63 E-value: 5.83e-03
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| PLN03116 | PLN03116 | ferredoxin--NADP+ reductase; Provisional |
165-276 | 6.07e-03 | |||||
ferredoxin--NADP+ reductase; Provisional Pssm-ID: 215586 [Multi-domain] Cd Length: 307 Bit Score: 37.77 E-value: 6.07e-03
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