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Article Dans Une Revue Nature Communications Année : 2021

Nanoscale architecture of a VAP-A-OSBP tethering complex at membrane contact sites

Résumé

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.
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Dates et versions

hal-03256855 , version 1 (10-06-2021)

Identifiants

Citer

Eugenio de La Mora, Manuela Dezi, Aurélie Di Cicco, Joëlle Bigay, Romain Gautier, et al.. Nanoscale architecture of a VAP-A-OSBP tethering complex at membrane contact sites. Nature Communications, 2021, 12, pp.3459. ⟨10.1038/s41467-021-23799-1⟩. ⟨hal-03256855⟩
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