WT Chicken Scap L1-L7 / Fab 4G10 complex focused refinement
要素
4G10 heavy chain
4G10 light chain
Sterol regulatory element-binding protein cleavage-activating protein
キーワード
LIPID BINDING PROTEIN / Cholesterol / SREBP
機能・相同性
機能・相同性情報
Regulation of cholesterol biosynthesis by SREBP (SREBF) / SREBP-SCAP complex / regulation of cholesterol biosynthetic process / sterol binding / SREBP signaling pathway / regulation of fatty acid biosynthetic process / cholesterol metabolic process / response to insulin / positive regulation of cholesterol biosynthetic process / ER to Golgi transport vesicle membrane ...Regulation of cholesterol biosynthesis by SREBP (SREBF) / SREBP-SCAP complex / regulation of cholesterol biosynthetic process / sterol binding / SREBP signaling pathway / regulation of fatty acid biosynthetic process / cholesterol metabolic process / response to insulin / positive regulation of cholesterol biosynthetic process / ER to Golgi transport vesicle membrane / response to hypoxia / immune response / Golgi membrane / endoplasmic reticulum membrane 類似検索 - 分子機能
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R35GM116387
米国
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R01GM136976
米国
National Institutes of Health/National Heart, Lung, and Blood Institute (NIH/NHLBI)
P01HL020948
米国
Welch Foundation
I-1770
米国
Welch Foundation
I-1793
米国
Welch Foundation
I-1944
米国
Mallinckrodt Foundation
米国
Cancer Prevention and Research Institute of Texas (CPRIT)
RR160082
米国
Leducq Foundation
19CVD04
フランス
American Heart Association
18POST34080141
米国
Cancer Prevention and Research Institute of Texas (CPRIT)
RP170644
米国
引用
ジャーナル: Cell / 年: 2021 タイトル: Scap structures highlight key role for rotation of intertwined luminal loops in cholesterol sensing. 著者: Daniel L Kober / Arun Radhakrishnan / Joseph L Goldstein / Michael S Brown / Lindsay D Clark / Xiao-Chen Bai / Daniel M Rosenbaum / 要旨: The cholesterol-sensing protein Scap induces cholesterol synthesis by transporting membrane-bound transcription factors called sterol regulatory element-binding proteins (SREBPs) from the endoplasmic ...The cholesterol-sensing protein Scap induces cholesterol synthesis by transporting membrane-bound transcription factors called sterol regulatory element-binding proteins (SREBPs) from the endoplasmic reticulum (ER) to the Golgi apparatus for proteolytic activation. Transport requires interaction between Scap's two ER luminal loops (L1 and L7), which flank an intramembrane sterol-sensing domain (SSD). Cholesterol inhibits Scap transport by binding to L1, which triggers Scap's binding to Insig, an ER retention protein. Here we used cryoelectron microscopy (cryo-EM) to elucidate two structures of full-length chicken Scap: (1) a wild-type free of Insigs and (2) mutant Scap bound to chicken Insig without cholesterol. Strikingly, L1 and L7 intertwine tightly to form a globular domain that acts as a luminal platform connecting the SSD to the rest of Scap. In the presence of Insig, this platform undergoes a large rotation accompanied by rearrangement of Scap's transmembrane helices. We postulate that this conformational change halts Scap transport of SREBPs and inhibits cholesterol synthesis.