Mso1p regulates membrane fusion through interactions with the putative N-peptide-binding area in Sec1p domain 1.

Abstract:

:Sec1p/Munc18 (SM) family proteins regulate SNARE complex function in membrane fusion through their interactions with syntaxins. In addition to syntaxins, only a few SM protein interacting proteins are known and typically, their binding modes with SM proteins are poorly characterized. We previously identified Mso1p as a Sec1p-binding protein and showed that it is involved in membrane fusion regulation. Here we demonstrate that Mso1p and Sec1p interact at sites of exocytosis and that the Mso1p-Sec1p interaction site depends on a functional Rab GTPase Sec4p and its GEF Sec2p. Random and targeted mutagenesis of Sec1p, followed by analysis of protein interactions, indicates that Mso1p interacts with Sec1p domain 1 and that this interaction is important for membrane fusion. In many SM family proteins, domain 1 binds to a N-terminal peptide of a syntaxin family protein. The Sec1p-interacting syntaxins Sso1p and Sso2p lack the N-terminal peptide. We show that the putative N-peptide binding area in Sec1p domain 1 is important for Mso1p binding, and that Mso1p can interact with Sso1p and Sso2p. Our results suggest that Mso1p mimics N-peptide binding to facilitate membrane fusion.

journal_name

Mol Biol Cell

authors

Weber M,Chernov K,Turakainen H,Wohlfahrt G,Pajunen M,Savilahti H,Jäntti J

doi

10.1091/mbc.e09-07-0546

subject

Has Abstract

pub_date

2010-04-15 00:00:00

pages

1362-74

issue

8

eissn

1059-1524

issn

1939-4586

pii

E09-07-0546

journal_volume

21

pub_type

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