InnateDB: Systems Biology of the Innate Immune Response

Homo sapiens Protein: SCAP

Summary

InnateDB Protein

IDBP-586492.3

Last Modified

2014-10-13 [Report errors or provide feedback]

Gene Symbol

SCAP

Protein Name

SREBF chaperone

Synonyms

Species

Homo sapiens

Ensembl Protein

ENSP00000438956

InnateDB Gene

IDBG-31555 (SCAP)

Protein Structure

UniProt Annotation

Function

Escort protein required for cholesterol as well as lipid homeostasis. Regulates export of the SCAP/SREBF complex from the ER upon low cholesterol. Formation of a ternary complex with INSIG at high sterol concentrations leads to masking of an ER-export signal in SCAP and retention of the complex in the ER. Low sterol concentrations trigger release of INSIG, a conformational change in the SSC domain of SCAP, unmasking of the ER export signal, recruitment into COPII-coated vesicles, transport to the Golgi complex, proteolytic cleavage of SREBF in the Golgi, release of the transcription factor fragment of SREBF from the membrane, its import into the nucleus and up-regulation of LDLR, INSIG1 and the mevalonate pathway (By similarity). {ECO:0000250}.

Subcellular Localization

Endoplasmic reticulum membrane {ECO:0000250}; Multi-pass membrane protein {ECO:0000250}. Golgi apparatus membrane {ECO:0000250}; Multi-pass membrane protein {ECO:0000250}. Cytoplasmic vesicle, COPII-coated vesicle membrane {ECO:0000250}; Multi-pass membrane protein {ECO:0000250}. Note=Moves from the endoplasmic reticulum to the Golgi in the absence of sterols. {ECO:0000250}.

Disease Associations

Tissue Specificity

Comments

Interactions

Number of Interactions

This gene and/or its encoded proteins are associated with 13 experimentally validated interaction(s) in this database.

Experimentally validated
Total	13 [view]
Protein-Protein	13 [view]
Protein-DNA	0
Protein-RNA	0
DNA-DNA	0
RNA-RNA	0
DNA-RNA	0

Gene Ontology

Molecular Function

Accession	GO Term
GO:0005515	protein binding
GO:0008158	hedgehog receptor activity
GO:0051082	unfolded protein binding

Biological Process

GO:0032933	SREBP signaling pathway
GO:0044281	small molecule metabolic process
GO:0045541	negative regulation of cholesterol biosynthetic process
GO:0045716	positive regulation of low-density lipoprotein particle receptor biosynthetic process

Cellular Component

GO:0000139	Golgi membrane
GO:0005783	endoplasmic reticulum
GO:0005789	endoplasmic reticulum membrane
GO:0005794	Golgi apparatus
GO:0012507	ER to Golgi transport vesicle membrane
GO:0016020	membrane
GO:0016021	integral component of membrane