basic Helix-Loop-Helix-zipper (bHLHzip) domain found in transcription factor EC (TFEC) and similar proteins; TFEC, also termed Class E basic helix-loop-helix protein 34 (bHLHe34), or transcription factor EC-like (TFEC-L), is a bHLHzip transcriptional regulator that acts as a repressor or an activator and regulates gene expression in macrophages. It plays an important role in the niche to expand hematopoietic progenitors through the modulation of several cytokines.

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 767947230 226 KERQKKDNHNLIERRRRYNINYRIKELGTLIPKSNDPDMRWNKGTILKASVEYIKWLQKEQQRARELEHRQKKLEQANRR 305
Cdd:cd18925    1 KERQKKDNHNLIERRRRYNINYRIKELGTLIPKSNDPDMRWNKGTILKASVEYIKWLQKEQQRARELEHRQKKLEQANRR 80

                 ....*
gi 767947230 306 LLLRI 310
Cdd:cd18925   81 LLLRI 85

basic Helix-Loop-Helix-zipper (bHLHzip) domain found in transcription factor EC (TFEC) and similar proteins; TFEC, also termed Class E basic helix-loop-helix protein 34 (bHLHe34), or transcription factor EC-like (TFEC-L), is a bHLHzip transcriptional regulator that acts as a repressor or an activator and regulates gene expression in macrophages. It plays an important role in the niche to expand hematopoietic progenitors through the modulation of several cytokines.

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 767947230 226 KERQKKDNHNLIERRRRYNINYRIKELGTLIPKSNDPDMRWNKGTILKASVEYIKWLQKEQQRARELEHRQKKLEQANRR 305
Cdd:cd18925    1 KERQKKDNHNLIERRRRYNINYRIKELGTLIPKSNDPDMRWNKGTILKASVEYIKWLQKEQQRARELEHRQKKLEQANRR 80

                 ....*
gi 767947230 306 LLLRI 310
Cdd:cd18925   81 LLLRI 85

helix loop helix domain;

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 767947230   235 NLIERRRRYNINYRIKELGTLIPkSNDPDMRWNKGTILKASVEYIKWLQKEQQ 287
Cdd:smart00353   1 NARERRRRRKINEAFDELRSLLP-TLPKNKKLSKAEILRLAIEYIKSLQEELQ 52

basic Helix-Loop-Helix-zipper (bHLHzip) domain found in transcription factor EC (TFEC) and similar proteins; TFEC, also termed Class E basic helix-loop-helix protein 34 (bHLHe34), or transcription factor EC-like (TFEC-L), is a bHLHzip transcriptional regulator that acts as a repressor or an activator and regulates gene expression in macrophages. It plays an important role in the niche to expand hematopoietic progenitors through the modulation of several cytokines.

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 767947230 226 KERQKKDNHNLIERRRRYNINYRIKELGTLIPKSNDPDMRWNKGTILKASVEYIKWLQKEQQRARELEHRQKKLEQANRR 305
Cdd:cd18925    1 KERQKKDNHNLIERRRRYNINYRIKELGTLIPKSNDPDMRWNKGTILKASVEYIKWLQKEQQRARELEHRQKKLEQANRR 80

                 ....*
gi 767947230 306 LLLRI 310
Cdd:cd18925   81 LLLRI 85

basic Helix-Loop-Helix-zipper (bHLHzip) domain found in transcription factor E3 (TFE3) and similar proteins; TFE3, also termed Class E basic helix-loop-helix protein 33 (bHLHe33), is a bHLHzip transcription factor that is involved in B cell function. It specifically recognizes and binds E-box sequences (5'-CANNTG-3'). Its efficient DNA-binding requires dimerization with itself or with another MiT/TFE family member such as TFEB or MITF.

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 767947230 220 DTRALAKERQKKDNHNLIERRRRYNINYRIKELGTLIPKSNDPDMRWNKGTILKASVEYIKWLQKEQQRARELEHRQKKL 299
Cdd:cd18928    1 EAKAFLKERQKKDNHNLIERRRRFNINDRIKELGTLIPKSTDPEMRWNKGTILKASVDYIRKLQKEQQRSKEIEMRQRKL 80

                         90
                 ....*....|.
gi 767947230 300 EQANRRLLLRI 310
Cdd:cd18928   81 EQANRSLQLRI 91

basic Helix-Loop-Helix-zipper (bHLHzip) domain found in the microphthalmia-associated transcription factor family (MITF) family; The MITF (also known as microphthalmia-TFE, or MiT) family is a small family that contain a basic helix loop helix domain associated with a leucine zipper (bHLHZip). The MITF family comprises four genes in mammals (MITF, TFE3, TFEB, and TFEC); each gene has different functions. MITF is involved in neural crest melanocytes development as well as the pigmented retinal epithelium. TFEB is required for vascularization of the mouse placenta. TFE3 is involved in B cell function. TFEC regulates gene expression in macrophages. The MITF family can form homodimers or heterodimers with each other but not with other bHLH or bHLHzip proteins.

                         10        20        30        40        50        60
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....
gi 767947230 226 KERQKKDNHNLIERRRRYNINYRIKELGTLIPKSNDPDMRWNKGTILKASVEYIKWLQKEQQRARELEH 294
Cdd:cd11397    1 KDRQKKDNHNMIERRRRFNINDRIKELGTLLPKSNDPDMRWNKGTILKASVDYIRKLQKEQERLRQLEE 69

basic Helix-Loop-Helix-zipper (bHLHzip) domain found in USF/MITF family; The USF (upstream stimulatory factor)/MITF (microphthalmia-associated transcription factor) family includes two bHLHzip transcription factor subfamilies. USFs are ubiquitously expressed and key regulators of a wide number of gene regulation networks, including the stress and immune responses, cell cycle and proliferation, lipid and glucid metabolism. USFs recruit chromatin remodeling enzymes and interact with co-activators and the members of the transcription pre-initiation complex. USFs interact with high affinity to E-box regulatory elements. The MITF (also known as microphthalmia-TFE, or MiT) subfamily comprises four genes in mammals (MITF, TFE3, TFEB, and TFEC); each gene has different functions. MITF is involved in neural crest melanocytes development as well as the pigmented retinal epithelium. TFEB is required for vascularization of the mouse placenta. TFE3 is involved in B cell function. TFEC regulates gene expression in macrophages. The MITF subfamily proteins can form homodimers or heterodimers with each other but not with other bHLH or bHLHzip proteins.

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*...
gi 767947230 233 NHNLIERRRRYNINYRIKELGTLIPKSND--PDMRWNKGTILKASVEYIKWLQKEQQR 288
Cdd:cd11387    1 SHNAVERRRRDNINEKIQELGSLVPPSRLetKDLKPNKGSILSKAVEYIRELQNQNQE 58

basic Helix-Loop-Helix-zipper (bHLHzip) domain found in sterol regulatory element-binding protein (SREBP) family; The SREBP family includes SREBP1 and SREBP2, which are bHLHzip transcriptional activator of genes encoding proteins essential for cholesterol biosynthesis/uptake and fatty acid biosynthesis. SREBP1 and SREBP2 are principally found in the liver and in adipocytes and made up of an N-terminal transcription factor portion (composed of an activation domain, a bHLHzip domain, and a nuclear localization signal), a hydrophobic region containing two membrane spanning regions, and a C-terminal regulatory segment. They recognize a symmetric sterol regulatory element (TCACNCCAC) instead of E-box.

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 767947230 226 KERQKKDNHNLIERRRRYNINYRIKELGTLIPKsndPDMRWNKGTILKASVEYIkwlqkeqqraRELEHRQKKLEQANRR 305
Cdd:cd11394    2 PKVEKRSAHNAIEKRYRSSINDRIIELKDLVVG---PDAKMNKSAVLRKAIDYI----------RYLQKVNQKLKQENMA 68

                 .
gi 767947230 306 L 306
Cdd:cd11394   69 L 69

basic Helix-Loop-Helix-zipper (bHLHzip) domain found in sterol regulatory element-binding protein 1 (SREBP1) and similar proteins; SREBP1, also termed Class D basic helix-loop-helix protein 1 (bHLHd1), or sterol regulatory element-binding transcription factor 1 (SREBF1), is a member of a family of bHLHzip transcription factors that recognize sterol regulatory element 1 (SRE-1). It acts as a transcriptional activator required for lipid homeostasis. It may control transcription of the low-density lipoprotein receptor gene as well as the fatty acid. SREBP1 has dual sequence specificity binding to both an E-box motif (5'-ATCACGTGA-3') and to SRE-1 (5'-ATCACCCCAC-3').

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 767947230 229 QKKDNHNLIERRRRYNINYRIKELGTLIPksnDPDMRWNKGTILKASVEYIKWLQKEQQrarelehrqkKLEQANRRLLL 308
Cdd:cd18921    5 EKRTAHNAIEKRYRSSINDKIIELKDLVV---GTEAKLNKSAVLRKAIDYIRFLQQSNQ----------KLKQENMALKM 71

                 ....
gi 767947230 309 RIQE 312
Cdd:cd18921   72 AVQK 75

basic Helix-Loop-Helix-zipper (bHLHzip) domain found in the Myc family; The Myc family is a member of the bHLHzip family of transcription factors that play important roles in the control of normal cell proliferation, growth, survival and differentiation. All Myc isoforms contain two independently functioning polypeptide chain regions: N-terminal transactivating residues and a C-terminal bHLHzip segment. The bHLHzip family of bHLH transcription factors are characterized by a highly conserved N-terminal basic region that may bind DNA at a consensus hexanucleotide sequence known as the E-box (CANNTG) followed by HLH and leucine zipper motifs that may interact with other proteins to form homo- and heterodimers. Myc heterodimerizes with Max enabling specific binding to E-box DNA sequences in the promoters of target genes. The Myc proto-oncoprotein family includes at least five different functional members: c-, N-, L-, S- and B-Myc (which is lacking the bHLH domain).

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*.
gi 767947230 268 KGTILKASVEYIKWLQKEQqraRELEHRQKKLEQANRRLLLRIQEL 313
Cdd:cd11400   38 KVVILKKATEYIKQLQQEE---KKLEKEKDKLKARNEQLRKKLERL 80