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Membrane contact sites are cellular structures that mediate interorganelle exchange and communication. The two major tether proteins of the endoplasmic reticulum (ER), VAP‐A and VAP‐B, interact with proteins from other organelles that possess a small VAP‐interacting motif, named FFAT [two phenylalanines (FF) in an acidic track (AT)]. In this study, using an unbiased proteomic approach, we identify a novel ER tether named motile sperm domain‐containing protein 2 (MOSPD2). We show that MOSPD2 possesses a Major Sperm Protein (MSP) domain which binds FFAT motifs and consequently allows membrane tethering  in vitro . MOSPD2 is an ER‐anchored protein, and it interacts with several FFAT‐containing tether proteins from endosomes, mitochondria, or Golgi. Consequently, MOSPD2 and these organelle‐bound proteins mediate the formation of contact sites between the ER and endosomes, mitochondria, or Golgi. Thus, we characterized here MOSPD2, a novel tethering component related to VAP proteins, bridging the ER with a variety of distinct organelles.

Identification of MOSPD2, a novel scaffold for endoplasmic reticulum membrane contact sites