Reviewed,
UniProtKB/Swiss-Prot P36956 (SRBP1_HUMAN)
Last modified
June 16, 2009.
Version 102.
History...
Clusters with 100%,
90%,
50% identity |
Documents (6) |
Third-party data |
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Names and origin
| Protein names | Recommended name: Sterol regulatory element-binding protein 1 Short name=SREBP-1 Alternative name(s): Sterol regulatory element-binding transcription factor 1 Cleaved into the following chain: 1- Recommended name: Processed sterol regulatory element-binding protein 1 | ||||
| Gene names |
| ||||
| Organism | Homo sapiens (Human) | ||||
| Taxonomic identifier | 9606 [NCBI] | ||||
| Taxonomic lineage | Eukaryota › Metazoa › Chordata › Craniata › Vertebrata › Euteleostomi › Mammalia › Eutheria › Euarchontoglires › Primates › Haplorrhini › Catarrhini › Hominidae › Homo |
Protein attributes
| Sequence length | 1147 AA. |
| Sequence status | Complete. |
| Sequence processing | The displayed sequence is further processed into a mature form. |
| Protein existence | Evidence at protein level. |
General annotation (Comments)
| Function | Transcriptional activator required for lipid homeostasis. Regulates transcription of the LDL receptor gene as well as the fatty acid and to a lesser degree the cholesterol synthesis pathway By similarity. Binds to the sterol regulatory element 1 (SRE-1) (5'-ATCACCCCAC-3'). Has dual sequence specificity binding to both an E-box motif (5'-ATCACGTGA-3') and to SRE-1 (5'-ATCACCCCAC-3'). |
| Subunit structure | Forms a tight complex with SCAP in the ER membrane. Efficient DNA binding of the soluble transcription factor fragment requires dimerization with another bHLH protein. Interacts with LMNA. |
| Subcellular location | Endoplasmic reticulum membrane; Multi-pass membrane protein. Golgi apparatus membrane; Multi-pass membrane protein. Cytoplasmic vesicle › COPII-coated vesicle membrane; Multi-pass membrane protein. Note: Moves from the endoplasmic reticulum to the Golgi in the absence of sterols. Processed sterol regulatory element-binding protein 1: Nucleus. |
| Tissue specificity | Expressed in a wide variety of tissues, most abundant in liver and adrenal gland. In fetal tissues lung and liver shows highest expression. Isoform SREBP-1C predominates in liver, adrenal gland and ovary, whereas isoform SREBP-1A predominates in hepatoma cell lines. Isoform SREBP-1A and isoform SREBP-1C are found in kidney, brain, white fat, and muscle. |
| Post-translational modification | At low cholesterol the SCAP/SREBP complex is recruited into COPII vesicles for export from the ER. In the Golgi complex SREBPs are cleaved sequentially by site-1 and site-2 protease. The first cleavage by site-1 protease occurs within the luminal loop, the second cleavage by site-2 protease occurs within the first transmembrane domain and releases the transcription factor from the Golgi membrane. Apoptosis triggers cleavage by the cysteine proteases caspase-3 and caspase-7. |
| Sequence similarities | Belongs to the SREBP family. Contains 1 basic helix-loop-helix (bHLH) domain. |
| Sequence caution | The sequence BAD92846.1 differs from that shown. Reason: Miscellaneous discrepancy. Intron retention. |
Ontologies
Binary interactions
With | Entry | #Exp. | IntAct | Notes |
|---|---|---|---|---|
| Crebbp | P45481 | 1 | EBI-948328,EBI-296306 | From a different organism. |
| MED15 | Q96RN5 | 4 | EBI-948328,EBI-394506 |
Alternative products
| This entry describes 4 isoforms produced by alternative splicing. [Align] [Select] Note: Additional isoforms seem to exist. | ||||||
| Isoform SREBP-1A (identifier: P36956-1) This isoform has been chosen as the 'canonical' sequence. All positional information in this entry refers to it. This is also the sequence that appears in the downloadable versions of the entry. | ||||||
| Isoform SREBP-1B (identifier: P36956-2) The sequence of this isoform differs from the canonical sequence as follows: 1035-1147: VFLHEATARL...LGGGTTVTSS → LMDVLTSESA...KVPGWHGRMD | ||||||
| Isoform SREBP-1C (identifier: P36956-3) The sequence of this isoform differs from the canonical sequence as follows: 1-29: MDEPPFSEAALEQALGEPCDLDAALLTDI → MDCTF 1035-1147: VFLHEATARL...LGGGTTVTSS → LMDVLTSESA...KVPGWHGRMD | ||||||
| Isoform 4 (identifier: P36956-4) The sequence of this isoform differs from the canonical sequence as follows: 30-30: E → EGEVGAGRGRANGLDAPRAGADRGAMDCTFE | ||||||
| Note: No experimental confirmation available. |
Sequence annotation (Features)
| Feature key | Position(s) | Length | Description | Graphical view | Feature identifier | ||||||||
Molecule processing | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chain | 1 – 1147 | 1147 | Sterol regulatory element-binding protein 1 | PRO_0000127447 | |||||||||
| Chain | 1 – 490 | 490 | Processed sterol regulatory element-binding protein 1 | PRO_0000314029 | |||||||||
Regions | |||||||||||||
| Topological domain | 1 – 487 | 487 | Cytoplasmic Potential | ||||||||||
| Transmembrane | 488 – 508 | 21 | Potential | ||||||||||
| Topological domain | 509 – 547 | 39 | Lumenal Potential | ||||||||||
| Transmembrane | 548 – 568 | 21 | Potential | ||||||||||
| Topological domain | 569 – 1147 | 579 | Cytoplasmic Potential | ||||||||||
| Domain | 337 – 374 | 38 | Helix-loop-helix motif | ||||||||||
| Domain | 373 – 394 | 22 | Leucine-zipper Potential | ||||||||||
| DNA binding | 323 – 336 | 14 | Basic motif | ||||||||||
| Region | 1 – 60 | 60 | Transcriptional activation (acidic) | ||||||||||
| Region | 234 – 497 | 264 | Interaction with LMNA By similarity | ||||||||||
| Compositional bias | 61 – 178 | 118 | Pro/Ser-rich | ||||||||||
| Compositional bias | 427 – 462 | 36 | Gly/Pro/Ser-rich | ||||||||||
Sites | |||||||||||||
| Site | 460 – 461 | 2 | Cleavage; by caspase-3 and caspase-7 By similarity | ||||||||||
| Site | 490 – 491 | 2 | Cleavage; by S2P By similarity | ||||||||||
| Site | 530 – 531 | 2 | Cleavage; by S1P Probable | ||||||||||
Amino acid modifications | |||||||||||||
| Modified residue | 110 | 1 | Phosphotyrosine By similarity | ||||||||||
| Modified residue | 117 | 1 | Phosphoserine Ref.8 | ||||||||||
| Modified residue | 1019 | 1 | Phosphoserine Ref.7 | ||||||||||
| Modified residue | 1020 | 1 | Phosphoserine Ref.7 | ||||||||||
Natural variations | |||||||||||||
| Alternative sequence | 1 – 29 | 29 | MDEPP…LLTDI → MDCTF in isoform SREBP-1C. | VSP_002149 | |||||||||
| Alternative sequence | 30 | 1 | E → EGEVGAGRGRANGLDAPRAG ADRGAMDCTFE in isoform 4. | VSP_030859 | |||||||||
| Alternative sequence | 1035 – 1147 | 113 | VFLHE…TVTSS → LMDVLTSESAWALPQHLGKG FPSPSGHKVPGWHGRMD in isoform SREBP-1B and isoform SREBP-1C. | VSP_002150 | |||||||||
| Natural variant | 306 | 1 | N → S: dbSNP rs17855793. Ref.4 | VAR_038468 | |||||||||
| Natural variant | 309 | 1 | A → T: dbSNP rs35188700. | VAR_038469 | |||||||||
| Natural variant | 417 | 1 | V → M: dbSNP rs2229590. | VAR_038470 | |||||||||
| Natural variant | 580 | 1 | V → M: dbSNP rs36215896. | VAR_038471 | |||||||||
| Natural variant | 746 | 1 | R → H: dbSNP rs2228461. | VAR_038472 | |||||||||
| Natural variant | 834 | 1 | S → L: dbSNP rs17855792. Ref.4 | VAR_038473 | |||||||||
| Natural variant | 1000 | 1 | T → A: dbSNP rs1042017. Ref.1 Ref.2 | VAR_038474 | |||||||||
| Natural variant | 1008 | 1 | A → P: dbSNP rs35014224. | VAR_038475 | |||||||||
Experimental info | |||||||||||||
| Mutagenesis | 455 | 1 | S → A: No effect on proteolytic processing. | ||||||||||
| Mutagenesis | 456 | 1 | D → A: No effect on proteolytic processing. | ||||||||||
| Mutagenesis | 457 | 1 | S → A: No effect on proteolytic processing. | ||||||||||
| Mutagenesis | 460 | 1 | D → A: No effect on proteolytic processing. | ||||||||||
| Mutagenesis | 466 | 1 | D → A: No effect on proteolytic processing. | ||||||||||
| Mutagenesis | 481 | 1 | G → A: No effect on proteolytic processing. | ||||||||||
| Mutagenesis | 482 | 1 | M → A: No effect on proteolytic processing. | ||||||||||
| Mutagenesis | 483 | 1 | L → A: No effect on proteolytic processing. | ||||||||||
| Mutagenesis | 484 – 487 | 4 | DRSR → AS: Strong reduction of proteolytic processing in response to low sterol. | ||||||||||
| Mutagenesis | 484 | 1 | D → A: Loss of proteolytic processing in response to low sterol. | ||||||||||
| Mutagenesis | 485 | 1 | R → A: No effect on proteolytic processing. | ||||||||||
| Mutagenesis | 527 | 1 | R → A: Loss of proteolytic processing in response to low sterol. | ||||||||||
Secondary structure | |||||||||||||
Helix Strand Turn | |||||||||||||
| Helix | 321 – 350 | 30 | |||||||||||
| Helix | 359 – 396 | 38 | |||||||||||
Sequences
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References
| « Hide 'large scale' references | |
| [1] | "SREBP-1, a basic-helix-loop-helix-leucine zipper protein that controls transcription of the low density lipoprotein receptor gene." Yokoyama C., Wang X., Briggs M.R., Admon A., Wu J., Hua X., Goldstein J.L., Brown M.S. Cell 75:187-197(1993) [PubMed: 8402897] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [MRNA] (ISOFORM SREBP-1A), NUCLEOTIDE SEQUENCE [MRNA] OF 1-29 (ISOFORM SREBP-1C), NUCLEOTIDE SEQUENCE [MRNA] OF 1035-1147 (ISOFORMS SREBP-1B AND SREBP-1C), PARTIAL PROTEIN SEQUENCE, VARIANT ALA-1000. Tissue: Cervix carcinoma. |
| [2] | "Structure of the human gene encoding sterol regulatory element binding protein-1 (SREBF1) and localization of SREBF1 and SREBF2 to chromosomes 17p11.2 and 22q13." Hua X., Wu J., Goldstein J.L., Brown M.S., Hobbs H.H. Genomics 25:667-673(1995) [PubMed: 7759101] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [GENOMIC DNA], VARIANT ALA-1000. Tissue: Fetal brain. |
| [3] | Mural R.J., Istrail S., Sutton G.G., Florea L., Halpern A.L., Mobarry C.M., Lippert R., Walenz B., Shatkay H., Dew I., Miller J.R., Flanigan M.J., Edwards N.J., Bolanos R., Fasulo D., Halldorsson B.V., Hannenhalli S., Turner R. Venter J.C.Submitted (SEP-2005) to the EMBL/GenBank/DDBJ databases Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA] (ISOFORM SREBP-1A). |
| [4] | "The status, quality, and expansion of the NIH full-length cDNA project: the Mammalian Gene Collection (MGC)." The MGC Project Team Genome Res. 14:2121-2127(2004) [PubMed: 15489334] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE MRNA] (ISOFORMS SREBP-1A AND 4), VARIANTS SER-306 AND LEU-834. Tissue: Brain, Placenta and Uterus. |
| [5] | Totoki Y., Toyoda A., Takeda T., Sakaki Y., Tanaka A., Yokoyama S., Ohara O., Nagase T., Kikuno R.F. Submitted (MAR-2005) to the EMBL/GenBank/DDBJ databases Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE MRNA] OF 31-1147 (ISOFORM SREBP-1A/4). Tissue: Spleen. |
| [6] | "Regulated cleavage of sterol regulatory element binding proteins requires sequences on both sides of the endoplasmic reticulum membrane." Hua X., Sakai J., Brown M.S., Goldstein J.L. J. Biol. Chem. 271:10379-10384(1996) [PubMed: 8626610] [Abstract] Cited for: CHARACTERIZATION, MUTAGENESIS. |
| [7] | "Global, in vivo, and site-specific phosphorylation dynamics in signaling networks." Olsen J.V., Blagoev B., Gnad F., Macek B., Kumar C., Mortensen P., Mann M. Cell 127:635-648(2006) [PubMed: 17081983] [Abstract] Cited for: PHOSPHORYLATION [LARGE SCALE ANALYSIS] AT SER-1019 AND SER-1020, MASS SPECTROMETRY. Tissue: Epithelium. |
| [8] | "A quantitative atlas of mitotic phosphorylation." Dephoure N., Zhou C., Villen J., Beausoleil S.A., Bakalarski C.E., Elledge S.J., Gygi S.P. Proc. Natl. Acad. Sci. U.S.A. 105:10762-10767(2008) [PubMed: 18669648] [Abstract] Cited for: PHOSPHORYLATION [LARGE SCALE ANALYSIS] AT SER-117, MASS SPECTROMETRY. |
| [9] | "Co-crystal structure of sterol regulatory element binding protein 1a at 2.3-A resolution." Parraga A., Bellsolell L., Ferre-D'Amare A.R., Burley S.K. Structure 6:661-672(1998) [PubMed: 9634703] [Abstract] Cited for: X-RAY CRYSTALLOGRAPHY (2.3 ANGSTROMS) OF 319-394. |
| + | Additional computationally mapped references. |
Cross-references
Sequence databases | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| U00968 mRNA. Translation: AAC50051.2. S66167 mRNA. Translation: AAB28522.2. Different initiation. S66168 mRNA. Translation: AAB28523.1. CH471196 Genomic DNA. Translation: EAW55689.1. BC023621 mRNA. Translation: AAH23621.1. BC026962 mRNA. Translation: AAH26962.1. BC057388 mRNA. Translation: AAH57388.1. BC063281 mRNA. Translation: AAH63281.1. AB209609 mRNA. Translation: BAD92846.1. | |||||||||||||
| IPI | IPI00220878. IPI00418428. IPI00419318. IPI00795043. | ||||||||||||
| PIR | A48845. | ||||||||||||
| RefSeq | NP_001005291.1. NP_004167.3. | ||||||||||||
| UniGene | Hs.592123 Hs.655395 | ||||||||||||
3D structure databases | |||||||||||||
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| ModBase | Search... | ||||||||||||
Protein-protein interaction databases | |||||||||||||
| IntAct | P36956. 13 interactions. | ||||||||||||
PTM databases | |||||||||||||
| PhosphoSite | P36956. | ||||||||||||
Proteomic databases | |||||||||||||
| PRIDE | P36956. | ||||||||||||
Genome annotation databases | |||||||||||||
| Ensembl | ENSG00000072310. Homo sapiens. [Contig view] | ||||||||||||
| GeneID | 6720. | ||||||||||||
| KEGG | hsa:6720. | ||||||||||||
Organism-specific databases | |||||||||||||
| GeneCards | GC17M017655. | ||||||||||||
| HGNC | HGNC:11289. SREBF1. | ||||||||||||
| HPA | CAB005406. | ||||||||||||
| MIM | 184756. gene. | ||||||||||||
| PharmGKB | PA335. | ||||||||||||
| GenAtlas | Search... | ||||||||||||
Phylogenomic databases | |||||||||||||
| HOVERGEN | P36956. | ||||||||||||
| OMA | P36956. DCTFEDM. | ||||||||||||
Enzyme and pathway databases | |||||||||||||
| Pathway_Interaction_DB | caspase_pathway. Caspase cascade in apoptosis. rxr_vdr_pathway. RXR and RAR hetrodimerization with other nuclear receptor. | ||||||||||||
Gene expression databases | |||||||||||||
| Bgee | P36956. | ||||||||||||
| CleanEx | HS_SREBF1. | ||||||||||||
| GermOnline | ENSG00000072310. Homo sapiens. | ||||||||||||
Family and domain databases | |||||||||||||
| InterPro | IPR001092. HLH_basic. IPR011598. HLH_DNA_bd. [Graphical view] | ||||||||||||
| Gene3D | G3DSA:4.10.280.10. HLH_DNA_bd. 1 hit. | ||||||||||||
| Pfam | PF00010. HLH. 1 hit. [Graphical view] | ||||||||||||
| SMART | SM00353. HLH. 1 hit. [Graphical view] | ||||||||||||
| PROSITE | PS50888. HLH. 1 hit. [Graphical view] | ||||||||||||
| ProtoNet | Search... | ||||||||||||
Other Resources | |||||||||||||
| NextBio | 26212. | ||||||||||||
| PMAP-CutDB | P36956. | ||||||||||||
| SOURCE | Search... | ||||||||||||
Entry information
| Entry name | SRBP1_HUMAN | ||||||||
| Accession | Primary (citable) accession number: P36956 Secondary accession number(s): Q16062 Q8TAK9 | ||||||||
| Entry history |
| ||||||||
| Entry status | Reviewed (UniProtKB/Swiss-Prot) | ||||||||
| Annotation project | HPI (Human Proteome Initiative) | ||||||||
Relevant documents
| Human chromosome 17 Human chromosome 17: entries, gene names and cross-references to MIM |
| Human entries with polymorphisms or disease mutations List of human entries with polymorphisms or disease mutations |
| Human polymorphisms and disease mutations Index of human polymorphisms and disease mutations |
| MIM cross-references Online Mendelian Inheritance in Man (MIM) cross-references in UniProtKB/Swiss-Prot |
| PDB cross-references Index of Protein Data Bank (PDB) cross-references |
| SIMILARITY comments Index of protein domains and families |

Clusters with


