ジャーナル: Nat Commun / 年: 2021 タイトル: Nanoscale architecture of a VAP-A-OSBP tethering complex at membrane contact sites. 著者: Eugenio de la Mora / Manuela Dezi / Aurélie Di Cicco / Joëlle Bigay / Romain Gautier / John Manzi / Joël Polidori / Daniel Castaño-Díez / Bruno Mesmin / Bruno Antonny / Daniel Lévy / 要旨: Membrane contact sites (MCS) are subcellular regions where two organelles appose their membranes to exchange small molecules, including lipids. Structural information on how proteins form MCS is ...Membrane contact sites (MCS) are subcellular regions where two organelles appose their membranes to exchange small molecules, including lipids. Structural information on how proteins form MCS is scarce. We designed an in vitro MCS with two membranes and a pair of tethering proteins suitable for cryo-tomography analysis. It includes VAP-A, an ER transmembrane protein interacting with a myriad of cytosolic proteins, and oxysterol-binding protein (OSBP), a lipid transfer protein that transports cholesterol from the ER to the trans Golgi network. We show that VAP-A is a highly flexible protein, allowing formation of MCS of variable intermembrane distance. The tethering part of OSBP contains a central, dimeric, and helical T-shape region. We propose that the molecular flexibility of VAP-A enables the recruitment of partners of different sizes within MCS of adjustable thickness, whereas the T geometry of the OSBP dimer facilitates the movement of the two lipid-transfer domains between membranes.
A: 6528.0 Å / B: 6310.4004 Å / C: 2516.0 Å α=β=γ: 90.0 °
CCP4マップ ヘッダ情報:
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Image stored as Reals
Å/pix. X/Y/Z
6.8
6.8
6.8
M x/y/z
960
928
370
origin x/y/z
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0.000
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length x/y/z
6528.000
6310.400
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1
2
3
start NC/NR/NS
10
109
-9
NC/NR/NS
960
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-56.360
43.630
0.343
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添付データ
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試料の構成要素
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全体 : In vitro system formation of membrane contact sites between human...
全体
名称: In vitro system formation of membrane contact sites between human VAP-A and the OSBP construct N-PH-FFAT
要素
複合体: In vitro system formation of membrane contact sites between human VAP-A and the OSBP construct N-PH-FFAT
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超分子 #1: In vitro system formation of membrane contact sites between human...
超分子
名称: In vitro system formation of membrane contact sites between human VAP-A and the OSBP construct N-PH-FFAT タイプ: complex / ID: 1 / 親要素: 0 / 含まれる分子: #1