Recombinant Human Sterol regulatory element-binding protein cleavage-activating protein (SCAP), Truncated

Uniprot Id

Q12770

Target Species

Human

Target Name

SCAP

Target Full Name

Sterol regulatory element-binding protein cleavage-activating protein

Target Function

Escort protein required for cholesterol as well as lipid homeostasis. Regulates export of the SCAP-SREBP complex from the endoplasmic reticulum to the Golgi upon low cholesterol, thereby regulating the processing of sterol regulatory element-binding proteins (SREBPs) SREBF1/SREBP1 and SREBF2/SREBP2. At high sterol concentrations, formation of a ternary complex with INSIG (INSIG1 or INSIG2) leads to mask the ER export signal in SCAP, promoting retention of the complex in the endoplasmic reticulum. Low sterol concentrations trigger release of INSIG, a conformational change in the SSD domain of SCAP, unmasking of the ER export signal, promoting recruitment into COPII-coated vesicles and transport of the SCAP-SREBP to the Golgi: in the Golgi, SREBPs are then processed, releasing the transcription factor fragment of SREBPs from the membrane, its import into the nucleus and up-regulation of LDLR, INSIG1 and the mevalonate pathway. Binds cholesterol via its SSD domain.

Target 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.

Target Protein Families

WD repeat SCAP family

Target Synonyms

KIAA0199; SCAP; SCAP_HUMAN; SREBF chaperone; SREBF chaperone protein; SREBP cleavage activating protein; SREBP cleavage-activating protein; Sterol regulatory element binding protein cleavage-activating protein; Sterol regulatory element-binding protein cleavage-activating protein