ligand-binding domain of type C natriuretic peptide receptor; Ligand-binding domain of type C ...
47-442
0e+00
ligand-binding domain of type C natriuretic peptide receptor; Ligand-binding domain of type C natriuretic peptide receptor (NPR-C). NPR-C is found in atrial, mesentery, placenta, lung, kidney, venous tissue, aortic smooth muscle, and aortic endothelial cells. The affinity of NPR-C for natriuretic peptides is ANP>CNP>BNP. The extracellular domain of NPR-C is about 30% identical to NPR-A and NPR-B. However, unlike the cyclase-linked receptors, it contains only 37 intracellular amino acids and no guanylyl cyclase activity. Major function of NPR-C is to clear natriuretic peptides from the circulation or extracellular surroundings through constitutive receptor-mediated internalization and degradation.
:
Pssm-ID: 380609 [Multi-domain] Cd Length: 391 Bit Score: 750.92 E-value: 0e+00
Transmembrane domain of Ephrin Receptor A1 Protein Tyrosine Kinase; Ephrin receptors (EphRs) ...
471-503
1.37e-03
Transmembrane domain of Ephrin Receptor A1 Protein Tyrosine Kinase; Ephrin receptors (EphRs) comprise the largest subfamily of receptor PTKs, and are classified into two classes (EphA and EphB), corresponding to binding preferences for either GPI-anchored ephrin-A ligands or transmembrane ephrin-B ligands. Vertebrates have ten EphA and six EphB receptors, which display promiscuous ligand interactions within each class. EphA1 has been associated with late-onset Alzheimer's disease and certain cancers such as colorectal and gastric carcinomas. EphRs contain an ephrin binding domain and two fibronectin repeats extracellularly, a single-span transmembrane (TM) domain, and a cytoplasmic tyr kinase domain. Binding of the ephrin ligand to EphR requires cell-cell contact since both are anchored to the plasma membrane. This allows ephrin/EphR dimers to form, leading to the activation of the intracellular tyr kinase domain. The resulting downstream signals occur bidirectionally in both EphR-expressing cells (forward signaling) and ephrin-expressing cells (reverse signaling). The main effect of ephrin/EphR interaction is cell-cell repulsion or adhesion. Ephrin/EphR signaling is important in neural development and plasticity, cell morphogenesis and proliferation, cell-fate determination, embryonic development, tissue patterning, and angiogenesis. The TM domain mediates dimerization.
:
Pssm-ID: 214014 Cd Length: 38 Bit Score: 36.57 E-value: 1.37e-03
ligand-binding domain of type C natriuretic peptide receptor; Ligand-binding domain of type C ...
47-442
0e+00
ligand-binding domain of type C natriuretic peptide receptor; Ligand-binding domain of type C natriuretic peptide receptor (NPR-C). NPR-C is found in atrial, mesentery, placenta, lung, kidney, venous tissue, aortic smooth muscle, and aortic endothelial cells. The affinity of NPR-C for natriuretic peptides is ANP>CNP>BNP. The extracellular domain of NPR-C is about 30% identical to NPR-A and NPR-B. However, unlike the cyclase-linked receptors, it contains only 37 intracellular amino acids and no guanylyl cyclase activity. Major function of NPR-C is to clear natriuretic peptides from the circulation or extracellular surroundings through constitutive receptor-mediated internalization and degradation.
Pssm-ID: 380609 [Multi-domain] Cd Length: 391 Bit Score: 750.92 E-value: 0e+00
Receptor family ligand binding region; This family includes extracellular ligand binding ...
67-420
3.10e-52
Receptor family ligand binding region; This family includes extracellular ligand binding domains of a wide range of receptors. This family also includes the bacterial amino acid binding proteins of known structure.
Pssm-ID: 460062 [Multi-domain] Cd Length: 347 Bit Score: 181.43 E-value: 3.10e-52
Transmembrane domain of Ephrin Receptor A1 Protein Tyrosine Kinase; Ephrin receptors (EphRs) ...
471-503
1.37e-03
Transmembrane domain of Ephrin Receptor A1 Protein Tyrosine Kinase; Ephrin receptors (EphRs) comprise the largest subfamily of receptor PTKs, and are classified into two classes (EphA and EphB), corresponding to binding preferences for either GPI-anchored ephrin-A ligands or transmembrane ephrin-B ligands. Vertebrates have ten EphA and six EphB receptors, which display promiscuous ligand interactions within each class. EphA1 has been associated with late-onset Alzheimer's disease and certain cancers such as colorectal and gastric carcinomas. EphRs contain an ephrin binding domain and two fibronectin repeats extracellularly, a single-span transmembrane (TM) domain, and a cytoplasmic tyr kinase domain. Binding of the ephrin ligand to EphR requires cell-cell contact since both are anchored to the plasma membrane. This allows ephrin/EphR dimers to form, leading to the activation of the intracellular tyr kinase domain. The resulting downstream signals occur bidirectionally in both EphR-expressing cells (forward signaling) and ephrin-expressing cells (reverse signaling). The main effect of ephrin/EphR interaction is cell-cell repulsion or adhesion. Ephrin/EphR signaling is important in neural development and plasticity, cell morphogenesis and proliferation, cell-fate determination, embryonic development, tissue patterning, and angiogenesis. The TM domain mediates dimerization.
Pssm-ID: 214014 Cd Length: 38 Bit Score: 36.57 E-value: 1.37e-03
ligand-binding domain of type C natriuretic peptide receptor; Ligand-binding domain of type C ...
47-442
0e+00
ligand-binding domain of type C natriuretic peptide receptor; Ligand-binding domain of type C natriuretic peptide receptor (NPR-C). NPR-C is found in atrial, mesentery, placenta, lung, kidney, venous tissue, aortic smooth muscle, and aortic endothelial cells. The affinity of NPR-C for natriuretic peptides is ANP>CNP>BNP. The extracellular domain of NPR-C is about 30% identical to NPR-A and NPR-B. However, unlike the cyclase-linked receptors, it contains only 37 intracellular amino acids and no guanylyl cyclase activity. Major function of NPR-C is to clear natriuretic peptides from the circulation or extracellular surroundings through constitutive receptor-mediated internalization and degradation.
Pssm-ID: 380609 [Multi-domain] Cd Length: 391 Bit Score: 750.92 E-value: 0e+00
Ligand binding domain of natriuretic peptide receptor (NPR) family; Ligand binding domain of ...
50-440
0e+00
Ligand binding domain of natriuretic peptide receptor (NPR) family; Ligand binding domain of natriuretic peptide receptor (NPR) family which consists of three different subtypes: type A natriuretic peptide receptor (NPR-A, or GC-A), type B natriuretic peptide receptors (NPR-B, or GC-B), and type C natriuretic peptide receptor (NPR-C). There are three types of natriuretic peptide (NP) ligands specific to the receptors: atrial NP (ANP), brain or B-type NP (BNP), and C-type NP (CNP). The NP family is thought to have arisen through gene duplication during evolution and plays an essential role in cardiovascular and body fluid homeostasis. ANP and BNP bind mainly to NPR-A, while CNP binds specifically to NPR-B. Both NPR-A and NPR-B have guanylyl cyclase catalytic activity and produces intracellular secondary messenger cGMP in response to peptide-ligand binding. Consequently, the NPR-A activation results in vasodilation and inhibition of vascular smooth muscle cell proliferation. NPR-C acts as the receptor for all the three members of NP family, and functions as a clearance receptor. Unlike NPR-A and -B, NPR-C lacks an intracellular guanylyl cyclase domain and is thought to exert biological actions by sequestration of released natriuretic peptides and/or inhibition of adenylyl cyclase.
Pssm-ID: 380596 [Multi-domain] Cd Length: 394 Bit Score: 521.83 E-value: 0e+00
ligand-binding domain of membrane guanylyl-cyclase receptors; Ligand-binding domain of ...
51-433
1.26e-117
ligand-binding domain of membrane guanylyl-cyclase receptors; Ligand-binding domain of membrane guanylyl-cyclase receptors. Membrane guanylyl cyclases (GC) have a single membrane-spanning region and are activated by endogenous and exogenous peptides. This family can be divided into three major subfamilies: the natriuretic peptide receptors (NPRs), sensory organ-specific membrane GCs, and the enterotoxin/guanylin receptors. The binding of peptide ligands to the receptor results in the activation of the cytosolic catalytic domain. Three types of NPRs have been cloned from mammalian tissues: NPR-A/GC-A, NPR-B/ GC-B, and NPR-C. In addition, two of the GCs, GC-D and GC-G, appear to be pseudogenes in humans. Atrial natriuretic peptide (ANP) and brain natriuretic peptide (BNP) are produced in the heart, and both bind to the NPR-A. NPR-C, also termed the clearance receptor, binds each of the natriuretic peptides and can alter circulating levels of these peptides. The ligand binding domain of the NPRs exhibits strong structural similarity to the type 1 periplasmic binding fold protein family.
Pssm-ID: 380575 [Multi-domain] Cd Length: 391 Bit Score: 352.43 E-value: 1.26e-117
ligand-binding domain of family C G-protein couples receptors (GPCRs), membrane bound guanylyl ...
50-441
5.18e-111
ligand-binding domain of family C G-protein couples receptors (GPCRs), membrane bound guanylyl cyclases such as natriuretic peptide receptors (NPRs), and N-terminal leucine/isoleucine/valine-binding protein (LIVBP)-like domain of ionotropic glutamate rece; This CD represents the ligand-binding domain of the family C G-protein couples receptors (GPCRs), membrane bound guanylyl cyclases such as the family of natriuretic peptide receptors (NPRs), and the N-terminal leucine-isoleucine-valine binding protein (LIVBP)-like domain of the ionotropic glutamate receptors, all of which are structurally similar and related to the periplasmic-binding fold type 1 family. The family C GPCRs consists of metabotropic glutamate receptor (mGluR), a calcium-sensing receptor (CaSR), gamma-aminobutyric acid receptor (GABAbR), the promiscuous L-alpha-amino acid receptor GPR6A, families of taste and pheromone receptors, and orphan receptors. Truncated splicing variants of the orphan receptors are not included in this CD. The family C GPCRs are activated by endogenous agonists such as amino acids, ions, and sugar based molecules. Their amino terminal ligand-binding region is homologous to the bacterial leucine-isoleucine-valine binding protein (LIVBP) and a leucine binding protein (LBP). The ionotropic glutamate receptors (iGluRs) have an integral ion channel and are subdivided into three major groups based on their pharmacology and structural similarities: NMDA receptors, AMPA receptors, and kainate receptors. The family of membrane bound guanylyl cyclases is further divided into three subfamilies: the ANP receptor (GC-A)/C-type natriuretic peptide receptor (GC-B), the heat-stable enterotoxin receptor (GC-C)/sensory organ specific membrane GCs such as retinal receptors (GC-E, GC-F), and olfactory receptors (GC-D and GC-G).
Pssm-ID: 380493 [Multi-domain] Cd Length: 332 Bit Score: 333.62 E-value: 5.18e-111
Ligand-binding domain of type A natriuretic peptide receptor; Ligand-binding domain of type A ...
51-448
2.02e-88
Ligand-binding domain of type A natriuretic peptide receptor; Ligand-binding domain of type A natriuretic peptide receptor (NPR-A). NPR-A is one of three known single membrane-spanning natriuretic peptide receptors that regulate blood volume, blood pressure, ventricular hypertrophy, pulmonary hypertension, fat metabolism, and long bone growth. In mammals there are three natriuretic peptides: ANP, BNP, and CNP. NPR-A is highly expressed in kidney, adrenal, terminal ileum, adipose, aortic, and lung tissues. The rank order of NPR-A activation by natriuretic peptides is ANP>BNP>>CNP. Single allele-inactivating mutations in the promoter of human NPR-A are associated with hypertension and heart failure.
Pssm-ID: 380608 [Multi-domain] Cd Length: 408 Bit Score: 278.24 E-value: 2.02e-88
ligand-binding domain of type B natriuretic peptide receptor; Ligand-binding domain of type B ...
51-435
3.14e-83
ligand-binding domain of type B natriuretic peptide receptor; Ligand-binding domain of type B natriuretic peptide receptor (NPR-B). NPR-B is one of three known single membrane-spanning natriuretic peptide receptors that have been identified. Natriuretic peptides are family of structurally related but genetically distinct hormones/paracrine factors that regulate blood volume, blood pressure, ventricular hypertrophy, pulmonary hypertension, fat metabolism, and long bone growth. In mammals there are three natriuretic peptides: ANP, BNP, and CNP. Like NPR-A (or GC-A), NPR-B (or GC-B) is a transmembrane guanylyl cyclase, an enzyme that catalyzes the synthesis of cGMP. NPR-B is the predominant natriuretic peptide receptor in the brain. The rank of order activation of NPR-B by natriuretic peptides is CNP>>ANP>BNP. Homozygous inactivating mutations in human NPR-B cause a form of short-limbed dwarfism known as acromesomelic dysplasia type Maroteaux.
Pssm-ID: 380607 [Multi-domain] Cd Length: 399 Bit Score: 264.41 E-value: 3.14e-83
Receptor family ligand binding region; This family includes extracellular ligand binding ...
67-420
3.10e-52
Receptor family ligand binding region; This family includes extracellular ligand binding domains of a wide range of receptors. This family also includes the bacterial amino acid binding proteins of known structure.
Pssm-ID: 460062 [Multi-domain] Cd Length: 347 Bit Score: 181.43 E-value: 3.10e-52
Ligand-binding domain of membrane bound guanylyl cyclases; Ligand-binding domain of membrane ...
71-424
7.20e-39
Ligand-binding domain of membrane bound guanylyl cyclases; Ligand-binding domain of membrane bound guanylyl cyclases (GCs), which are known to be activated by sperm-activating peptides (SAPs), such as speract or resact. These ligand peptides are released by a range of invertebrates to stimulate the metabolism and motility of spermatozoa and are also potent chemoattractants. These GCs contain a single transmembrane segment, an extracellular ligand binding domain, and intracellular protein kinase-like and cyclase catalytic domains. GCs of insect and nematodes, which exhibit high sequence similarity to the speract receptor are also included in this model.
Pssm-ID: 380593 [Multi-domain] Cd Length: 400 Bit Score: 146.62 E-value: 7.20e-39
Ligand-binding domain of membrane guanylyl cyclase G; This group includes the ligand-binding ...
56-417
2.60e-34
Ligand-binding domain of membrane guanylyl cyclase G; This group includes the ligand-binding domain of membrane guanylyl cyclase G (GC-G) which is a sperm surface receptor and might function, similar to its sea urchin counterpart, in the early signaling event that regulates the Ca2+ influx/efflux and subsequent motility response in sperm. GC-G appears to be a pseudogene in human. Furthermore, in contrast to the other orphan receptor GCs, GC-G has a broad tissue distribution in rat, including lung, intestine, kidney, and skeletal muscle.
Pssm-ID: 380595 [Multi-domain] Cd Length: 390 Bit Score: 133.77 E-value: 2.60e-34
ligand-binding domain of GABAb receptors, which are metabotropic transmembrane receptors for ...
68-448
1.34e-25
ligand-binding domain of GABAb receptors, which are metabotropic transmembrane receptors for gamma-aminobutyric acid (GABA); Ligand-binding domain of GABAb receptors, which are metabotropic transmembrane receptors for gamma-aminobutyric acid (GABA). GABA is the major inhibitory neurotransmitter in the mammalian CNS and, like glutamate and other transmitters, acts via both ligand gated ion channels (GABAa receptors) and G-protein coupled receptors (GABAb receptor or GABAbR). GABAa receptors are members of the ionotropic receptor superfamily which includes alpha-adrenergic and glycine receptors. The GABAb receptor is a member of a receptor superfamily which includes the mGlu receptors. The GABAb receptor is coupled to G alpha-i proteins, and activation causes a decrease in calcium, an increase in potassium membrane conductance, and inhibition of cAMP formation. The response is thus inhibitory and leads to hyperpolarization and decreased neurotransmitter release, for example.
Pssm-ID: 380589 [Multi-domain] Cd Length: 404 Bit Score: 108.87 E-value: 1.34e-25
ligand-binding domain of membrane guanylyl cyclases (GC-D, GC-E, and GC-F) that are ...
62-432
1.35e-14
ligand-binding domain of membrane guanylyl cyclases (GC-D, GC-E, and GC-F) that are specifically expressed in sensory tissues; This group includes the ligand-binding domain of membrane guanylyl cyclases (GC-D, GC-E, and GC-F) that are specifically expressed in sensory tissues. They share a similar topology with an N-terminal extracellular ligand-binding domain, a single transmembrane domain, and a C-terminal cytosolic region that contains kinase-like and catalytic domains. GC-D is specifically expressed in a subpopulation of olfactory sensory neurons. GC-E and GC-F are colocalized within the same photoreceptor cells of the retina and have important roles in phototransduction. Unlike the other family members, GC-E and GC-F have no known extracellular ligands. Instead, they are activated under low calcium conditions by guanylyl cyclase activating proteins called GCAPs. GC-D expressing neurons have been implicated in pheromone detection and GC-D is phylogenetically more similar to the Ca2+-regulated GC-E and GC-F than to receptor GC-A, -B and -C which are activated by peptide ligands. Moreover, these olfactory GCs and retinal GCs share characteristic sequence similarity in a regulatory domain that is involved in the binding of GCAPs, suggesting GC-D activity may be regulated by an unknown extracellular ligand and intracellular Ca2+. Rodent GC-D-expressing neurons have been implicated in pheromone detection and were recently shown to respond to atmospheric CO2 which is an olfactory stimulus for many invertebrates and regulates some insect innate behavior, such as the location of food and hosts.
Pssm-ID: 380594 [Multi-domain] Cd Length: 379 Bit Score: 75.43 E-value: 1.35e-14
ligand-binding domain of the membrane guanylyl cyclase C; Ligand-binding domain of the ...
49-420
2.71e-13
ligand-binding domain of the membrane guanylyl cyclase C; Ligand-binding domain of the membrane guanylyl cyclase C (GC-C or StaR). StaR is a key receptor for the STa (Escherichia coli Heat Stable enterotoxin), a potent stimulant of intestinal chloride and bicarbonate secretion that cause acute secretory diarrhea. The catalytic domain of the STa/guanylin receptor type membrane GC is highly similar to those of the natriuretic peptide receptor (NPR) type and sensory organ-specific type membrane GCs (GC-D, GC-E and GC-F). The GC-C receptor is mainly expressed in the intestine of most vertebrates, but is also found in the kidney and other organs. Moreover, GC-C is activated by guanylin and uroguanylin, endogenous peptide ligands synthesized in the intestine and kidney. Consequently, the receptor activation results in increased cGMP levels and phosphorylation of the CFTR chloride channel and secretion.
Pssm-ID: 380592 Cd Length: 381 Bit Score: 71.36 E-value: 2.71e-13
ligand-binding domain of membrane-bound glutamate receptors that mediate excitatory ...
138-331
4.08e-07
ligand-binding domain of membrane-bound glutamate receptors that mediate excitatory transmission on the cellular surface through initial binding of glutamate; categorized into ionotropic glutamate receptors (iGluRs) and metabotropic glutamate receptors (m; Ligand-binding domain of membrane-bound glutamate receptors that mediate excitatory transmission on the cellular surface through initial binding of glutamate and are categorized into ionotropic glutamate receptors (iGluRs) and metabotropic glutamate receptors (mGluRs). The metabotropic glutamate receptors (mGluR) are key receptors in the modulation of excitatory synaptic transmission in the central nervous system. The mGluRs are coupled to G proteins and are thus distinct from the iGluRs which internally contain ligand-gated ion channels. The mGluR structure is divided into three regions: the extracellular region, the seven-spanning transmembrane region and the cytoplasmic region. The extracellular region is further divided into the ligand-binding domain (LBD) and the cysteine-rich domain. The LBD has sequence similarity to the LIVBP, which is a bacterial periplasmic protein (PBP), as well as to the extracellular region of both iGluR and the gamma-aminobutyric acid (GABA)b receptor. iGluRs are divided into three main subtypes based on pharmacological profile: NMDA, AMPA, and kainate receptors. All family C GPCRs have a large extracellular N terminus that contain a domain with homology to bacterial periplasmic amino acid-binding proteins.
Pssm-ID: 380573 Cd Length: 350 Bit Score: 52.30 E-value: 4.08e-07
Family C of G-protein coupled receptors and their close homologs, the type 1 ...
127-275
8.14e-06
Family C of G-protein coupled receptors and their close homologs, the type 1 periplasmic-binding proteins of ATP-binding cassette transporter-like systems; This CD includes members of the family C of G-protein coupled receptors and their close homologs, the type 1 periplasmic-binding proteins of ATP-binding cassette transporter-like systems. The family C GPCR includes glutamate/glycine-gated ion channels such as the NMDA receptor, G-protein-coupled receptors, metabotropic glutamate, GABA-B, calcium sensing, pheromone receptors, and atrial natriuretic peptide-guanylate cyclase receptors. The glutamate receptors that form cation-selective ion channels, iGluR, can be classified into three different subgroups according to their binding-affinity for the agonists NMDA (N-methyl-D-asparate), AMPA (alpha-amino-3-dihydro-5-methyl-3-oxo-4-isoxazolepropionic acid), and kainate. L-glutamate is a major neurotransmitter in the brain of vertebrates and acts through either mGluRs or iGluRs. mGluRs subunits possess seven transmembrane segments and a large N-terminal extracellular domain. ABC-type leucine-isoleucine-valine binding protein (LIVBP) is a bacterial periplasmic binding protein that has homology with the amino-terminal domain of the glutamate-receptor ion channels (iGluRs). The extracellular regions of iGluRs are made of two PBP-like domains in tandem, a LIVBP-like domain that constitutes the N terminus (included in this model) followed by a domain related to lysine-arginine-ornithine-binding protein (LAOBP) that belongs to the type 2 periplasmic binding fold protein superfamily. The uncharacterized periplasmic components of various ABC-type transport systems are also included in this family.
Pssm-ID: 380490 Cd Length: 306 Bit Score: 47.68 E-value: 8.14e-06
periplasmic ligand-binding domain of Arabidopsis thaliana glutamate receptors and its close ...
92-403
1.86e-05
periplasmic ligand-binding domain of Arabidopsis thaliana glutamate receptors and its close homologs in other plants; This group includes the ligand-binding domain of Arabidopsis thaliana glutamate receptors, which have sequence similarity with animal ionotropic glutamate receptor and its close homologs in other plants. The ligand-binding domain of GABAb receptors are metabotropic transmembrane receptors for gamma-aminobutyric acid (GABA). GABA is the major inhibitory neurotransmitter in the mammalian CNS and, like glutamate and other transmitters, acts via both ligand gated ion channels (GABAa receptors) and G-protein coupled receptors (GABAb receptor or GABAbR). GABAa receptors are members of the ionotropic receptor superfamily which includes alpha-adrenergic and glycine receptors. The GABAb receptor is a member of a receptor superfamily which includes the mGlu receptors. The GABAb receptor is coupled to G alpha-i proteins, and activation causes a decrease in calcium, an increase in potassium membrane conductance, and inhibition of cAMP formation. The response is thus inhibitory and leads to hyperpolarization and decreased neurotransmitter release, for example.
Pssm-ID: 380645 [Multi-domain] Cd Length: 373 Bit Score: 46.84 E-value: 1.86e-05
ligand binding domain of metabotropic glutamate receptors (mGluR); Ligand binding domain of ...
167-441
7.54e-05
ligand binding domain of metabotropic glutamate receptors (mGluR); Ligand binding domain of the metabotropic glutamate receptors (mGluR), which are members of the family C of G-protein-coupled receptors that transduce extracellular signals into G-protein activation and ultimately into cellular responses. mGluRs bind to glutamate and function as an excitatory neurotransmitter; they are involved in learning, memory, anxiety, and the perception of pain. Eight subtypes of mGluRs have been cloned so far, and are classified into three groups according to their sequence similarities, transduction mechanisms, and pharmacological profiles. Group I is composed of mGlu1R and mGlu5R that both stimulate PLC hydrolysis. Group II includes mGlu2R and mGlu3R, which inhibit adenylyl cyclase, as do mGlu4R, mGlu6R, mGlu7R, and mGlu8R, which form group III.
Pssm-ID: 380585 [Multi-domain] Cd Length: 460 Bit Score: 45.36 E-value: 7.54e-05
N-terminal leucine-isoleucine-valine binding protein (LIVBP)-like domain of the kainate ...
71-412
1.35e-04
N-terminal leucine-isoleucine-valine binding protein (LIVBP)-like domain of the kainate receptors; N-terminal leucine-isoleucine-valine binding protein (LIVBP)-like domain of the kainate receptors, non-NMDA ionotropic receptors which respond to the neurotransmitter glutamate. While this N-terminal domain belongs to the periplasmic-binding fold type 1 superfamily, the glutamate-binding domain of the iGluR is structurally homologous to the periplasmic-binding fold type 2. The LIVBP-like domain of iGluRs is thought to play a role in the initial assembly of iGluR subunits, but it is not well understood how this domain is arranged and functions in intact iGluR. Kainate receptors have five subunits, GluR5, GluR6, GluR7, KA1 and KA2, which are structurally similar to AMPA and NMDA subunits of ionotropic glutamate receptors. KA1 and KA2 subunits can only form functional receptors with one of the GluR5-7 subunits. Moreover, GluR5-7 can also form functional homomeric receptor channels activated by kainate and glutamate when expressed in heterologous systems. Kainate receptors are involved in excitatory neurotransmission by activating postsynaptic receptors and in inhibitory neurotransmission by modulating release of the inhibitory neurotransmitter GABA through a presynaptic mechanism. Kainate receptors are closely related to AMAP receptors. In contrast of AMPA receptors, kainate receptors play only a minor role in signaling at synapses and their function is not well defined.
Pssm-ID: 380605 Cd Length: 335 Bit Score: 44.14 E-value: 1.35e-04
N-terminal leucine-isoleucine-valine binding protein (LIVBP)-like domain of the non-NMDA ...
127-283
8.52e-04
N-terminal leucine-isoleucine-valine binding protein (LIVBP)-like domain of the non-NMDA (N-methyl-D-aspartate) subtypes of ionotropic glutamate receptors; N-terminal leucine-isoleucine-valine binding protein (LIVBP)-like domain of the non-NMDA (N-methyl-D-asparate) subtypes of ionotropic glutamate receptors. While this N-terminal domain belongs to the periplasmic-binding fold type 1 superfamily, the glutamate-binding domain of the iGluR is structurally homologous to the periplasmic-binding fold type 2. The LIVBP-like domain of iGluRs is thought to play a role in the initial assembly of iGluR subunits, but it is not well understood how this domain is arranged and functions in intact iGluR. Glutamate mediates the majority of excitatory synaptic transmission in the central nervous system via two broad classes of ionotropic receptors, characterized by their response to glutamate agonists: N-methyl-D-aspartate (NMDA) and non-NMDA receptors. NMDA receptors have intrinsically slow kinetics, are highly permeable to Ca2+, and are blocked by extracellular Mg2+ in a voltage-dependent manner. Non-NMDA receptors have faster kinetics, are most often only weakly permeable to Ca2+, and are not blocked by extracellular Mg2+. While non-NMDA receptors typically mediate excitatory synaptic responses at resting membrane potentials, NMDA receptors contribute several forms of synaptic plasticity and are thought to play an important role in the development of synaptic pathways. Non-NMDA receptors include alpha-amino-3-hydroxy-5-methyl-4-isoxazole proprionate (AMPA) and kainate receptors.
Pssm-ID: 380591 [Multi-domain] Cd Length: 339 Bit Score: 41.58 E-value: 8.52e-04
N-terminal leucine-isoleucine-valine-binding protein (LIVBP)-like domain of the NR1, an ...
137-461
8.92e-04
N-terminal leucine-isoleucine-valine-binding protein (LIVBP)-like domain of the NR1, an essential channel-forming subunit of the NMDA receptor; N-terminal leucine-isoleucine-valine binding protein (LIVBP)-like domain of the NR1, an essential channel-forming subunit of the NMDA receptor. The ionotropic N-methyl-D-asparate (NMDA) subtype of glutamate receptor serves critical functions in neuronal development, functioning, and degeneration in the mammalian central nervous system. The functional NMDA receptor is a heterotetramer ccomposed of two NR1 and two NR2 (A, B, C, and D) or of NR3 (A and B) subunits. The receptor controls a cation channel that is highly permeable to monovalent ions and calcium and exhibits voltage-dependent inhibition by magnesium. Dual agonists, glutamate and glycine, are required for efficient activation of the NMDA receptor. When co-expressed with NR1, the NR3 subunits form receptors that are activated by glycine alone and therefore can be classified as excitatory glycine receptors. NR1/NR3 receptors are calcium-impermeable and unaffected by ligands acting at the NR2 glutamate-binding site
Pssm-ID: 380602 Cd Length: 364 Bit Score: 41.56 E-value: 8.92e-04
Transmembrane domain of Ephrin Receptor A1 Protein Tyrosine Kinase; Ephrin receptors (EphRs) ...
471-503
1.37e-03
Transmembrane domain of Ephrin Receptor A1 Protein Tyrosine Kinase; Ephrin receptors (EphRs) comprise the largest subfamily of receptor PTKs, and are classified into two classes (EphA and EphB), corresponding to binding preferences for either GPI-anchored ephrin-A ligands or transmembrane ephrin-B ligands. Vertebrates have ten EphA and six EphB receptors, which display promiscuous ligand interactions within each class. EphA1 has been associated with late-onset Alzheimer's disease and certain cancers such as colorectal and gastric carcinomas. EphRs contain an ephrin binding domain and two fibronectin repeats extracellularly, a single-span transmembrane (TM) domain, and a cytoplasmic tyr kinase domain. Binding of the ephrin ligand to EphR requires cell-cell contact since both are anchored to the plasma membrane. This allows ephrin/EphR dimers to form, leading to the activation of the intracellular tyr kinase domain. The resulting downstream signals occur bidirectionally in both EphR-expressing cells (forward signaling) and ephrin-expressing cells (reverse signaling). The main effect of ephrin/EphR interaction is cell-cell repulsion or adhesion. Ephrin/EphR signaling is important in neural development and plasticity, cell morphogenesis and proliferation, cell-fate determination, embryonic development, tissue patterning, and angiogenesis. The TM domain mediates dimerization.
Pssm-ID: 214014 Cd Length: 38 Bit Score: 36.57 E-value: 1.37e-03
ligand binding domain of the group I metabotropic glutamate receptor; Ligand binding domain of ...
165-276
2.11e-03
ligand binding domain of the group I metabotropic glutamate receptor; Ligand binding domain of the group I metabotropic glutamate receptor, a family containing mGlu1R and mGlu5R, all of which stimulate phospholipase C (PLC) hydrolysis. The metabotropic glutamate receptor is a member of the family C of G-protein-coupled receptors that transduce extracellular signals into G-protein activation and ultimately into intracellular responses. The mGluRs are classified into three groups which comprise eight subtypes.
Pssm-ID: 380597 [Multi-domain] Cd Length: 474 Bit Score: 40.79 E-value: 2.11e-03
Database: CDSEARCH/cdd Low complexity filter: no Composition Based Adjustment: yes E-value threshold: 0.01
References:
Wang J et al. (2023), "The conserved domain database in 2023", Nucleic Acids Res.51(D)384-8.
Lu S et al. (2020), "The conserved domain database in 2020", Nucleic Acids Res.48(D)265-8.
Marchler-Bauer A et al. (2017), "CDD/SPARCLE: functional classification of proteins via subfamily domain architectures.", Nucleic Acids Res.45(D)200-3.
of the residues that compose this conserved feature have been mapped to the query sequence.
Click on the triangle to view details about the feature, including a multiple sequence alignment
of your query sequence and the protein sequences used to curate the domain model,
where hash marks (#) above the aligned sequences show the location of the conserved feature residues.
The thumbnail image, if present, provides an approximate view of the feature's location in 3 dimensions.
Click on the triangle for interactive 3D structure viewing options.
Functional characterization of the conserved domain architecture found on the query.
Click here to see more details.
This image shows a graphical summary of conserved domains identified on the query sequence.
The Show Concise/Full Display button at the top of the page can be used to select the desired level of detail: only top scoring hits
(labeled illustration) or all hits
(labeled illustration).
Domains are color coded according to superfamilies
to which they have been assigned. Hits with scores that pass a domain-specific threshold
(specific hits) are drawn in bright colors.
Others (non-specific hits) and
superfamily placeholders are drawn in pastel colors.
if a domain or superfamily has been annotated with functional sites (conserved features),
they are mapped to the query sequence and indicated through sets of triangles
with the same color and shade of the domain or superfamily that provides the annotation. Mouse over the colored bars or triangles to see descriptions of the domains and features.
click on the bars or triangles to view your query sequence embedded in a multiple sequence alignment of the proteins used to develop the corresponding domain model.
The table lists conserved domains identified on the query sequence. Click on the plus sign (+) on the left to display full descriptions, alignments, and scores.
Click on the domain model's accession number to view the multiple sequence alignment of the proteins used to develop the corresponding domain model.
To view your query sequence embedded in that multiple sequence alignment, click on the colored bars in the Graphical Summary portion of the search results page,
or click on the triangles, if present, that represent functional sites (conserved features)
mapped to the query sequence.
Concise Display shows only the best scoring domain model, in each hit category listed below except non-specific hits, for each region on the query sequence.
(labeled illustration) Standard Display shows only the best scoring domain model from each source, in each hit category listed below for each region on the query sequence.
(labeled illustration) Full Display shows all domain models, in each hit category below, that meet or exceed the RPS-BLAST threshold for statistical significance.
(labeled illustration) Four types of hits can be shown, as available,
for each region on the query sequence:
specific hits meet or exceed a domain-specific e-value threshold
(illustrated example)
and represent a very high confidence that the query sequence belongs to the same protein family as the sequences use to create the domain model
non-specific hits
meet or exceed the RPS-BLAST threshold for statistical significance (default E-value cutoff of 0.01, or an E-value selected by user via the
advanced search options)
the domain superfamily to which the specific and non-specific hits belong
multi-domain models that were computationally detected and are likely to contain multiple single domains
Retrieve proteins that contain one or more of the domains present in the query sequence, using the Conserved Domain Architecture Retrieval Tool
(CDART).
Modify your query to search against a different database and/or use advanced search options
