6TQT

The crystal structure of the MSP domain of human MOSPD2.

6TQT の概要

• エントリーDOI: 10.2210/pdb6tqt/pdb
• 分子名称: Motile sperm domain-containing protein 2, 1,2-ETHANEDIOL, PHOSPHATE ION, ... (4 entities in total)
• 機能のキーワード: membrane contact sites, ffat motif, msp domain, endoplasmic reticulum, protein binding
• 由来する生物種: Homo sapiens (Human)
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 24520.60

構造登録者

McEwen, A.G.,Poussin-Courmontagne, P.,Di Mattia, T.,Wendling, C.,Cavarelli, J.,Tomasetto, C.,Alpy, F. (登録日: 2019-12-17, 公開日: 2020-11-18, 最終更新日: 2024-01-24)

主引用文献

Di Mattia, T.,Martinet, A.,Ikhlef, S.,McEwen, A.G.,Nomine, Y.,Wendling, C.,Poussin-Courmontagne, P.,Voilquin, L.,Eberling, P.,Ruffenach, F.,Cavarelli, J.,Slee, J.,Levine, T.P.,Drin, G.,Tomasetto, C.,Alpy, F.
FFAT motif phosphorylation controls formation and lipid transfer function of inter-organelle contacts.
Embo J., 39:e104369-e104369, 2020

PubMed Abstract: Organelles are physically connected in membrane contact sites. The endoplasmic reticulum possesses three major receptors, VAP-A, VAP-B, and MOSPD2, which interact with proteins at the surface of other organelles to build contacts. VAP-A, VAP-B, and MOSPD2 contain an MSP domain, which binds a motif named FFAT (two phenylalanines in an acidic tract). In this study, we identified a non-conventional FFAT motif where a conserved acidic residue is replaced by a serine/threonine. We show that phosphorylation of this serine/threonine is critical for non-conventional FFAT motifs (named Phospho-FFAT) to be recognized by the MSP domain. Moreover, structural analyses of the MSP domain alone or in complex with conventional and Phospho-FFAT peptides revealed new mechanisms of interaction. Based on these new insights, we produced a novel prediction algorithm, which expands the repertoire of candidate proteins with a Phospho-FFAT that are able to create membrane contact sites. Using a prototypical tethering complex made by STARD3 and VAP, we showed that phosphorylation is instrumental for the formation of ER-endosome contacts, and their sterol transfer function. This study reveals that phosphorylation acts as a general switch for inter-organelle contacts.

PubMed: 33124732
DOI: 10.15252/embj.2019104369

実験手法

X-RAY DIFFRACTION (1.5 Å)