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Publication : Munc18a controls SNARE assembly through its interaction with the syntaxin N-peptide.

First Author  Burkhardt P Year  2008
Journal  EMBO J Volume  27
Issue  7 Pages  923-33
PubMed ID  18337752 Mgi Jnum  J:200400
Mgi Id  MGI:5508594 Doi  10.1038/emboj.2008.37
Citation  Burkhardt P, et al. (2008) Munc18a controls SNARE assembly through its interaction with the syntaxin N-peptide. EMBO J 27(7):923-33
abstractText  Sec1/Munc18-like (SM) proteins functionally interact with SNARE proteins in vesicular fusion. Despite their high sequence conservation, structurally disparate binding modes for SM proteins with syntaxins have been observed. Several SM proteins appear to bind only to a short peptide present at the N terminus of syntaxin, designated the N-peptide, while Munc18a binds to a 'closed' conformation formed by the remaining portion of syntaxin 1a. Here, we show that the syntaxin 16 N-peptide binds to the SM protein Vps45, but the remainder of syntaxin 16 strongly enhances the affinity of the interaction. Likewise, the N-peptide of syntaxin 1a serves as a second binding site in the Munc18a/syntaxin 1a complex. When the syntaxin 1a N-peptide is bound to Munc18a, SNARE complex formation is blocked. Removal of the N-peptide enables binding of syntaxin 1a to its partner SNARE SNAP-25, while still bound to Munc18a. This suggests that Munc18a controls the accessibility of syntaxin 1a to its partners, a role that might be common to all SM proteins.
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