期刊
NATURE STRUCTURAL & MOLECULAR BIOLOGY
卷 22, 期 7, 页码 547-+出版社
NATURE RESEARCH
DOI: 10.1038/nsmb.3038
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资金
- National Science Foundation of China [31370819, 91313301, 31130065]
- National Key Basic Research Program of China [2014CB910203 from the]
- US National Institutes of Health [NS37200]
UNC-13-Munc13s have a central function in synaptic-vesicle priming through their MUN domains. However, it is unclear whether this function arises from the ability of the MUN domain to mediate the transition from the Munc18-1-closed syntaxin-1 complex to the SNARE complex in vitro. The crystal structure of the rat Munc13-1 MUN domain now reveals an elongated, arch-shaped architecture formed by a-helical bundles, with a highly conserved hydrophobic pocket in the middle. Mutation of two residues (NF) in this pocket abolishes the stimulation caused by the Munc13-1 MUN domain on SNARE-complex assembly and on SNARE-dependent proteoliposome fusion in vitro. Moreover, the same mutation in UNC-13 abrogates synaptic-vesicle priming in Caenorhabditis elegans neuromuscular junctions. These results support the notion that orchestration of syntaxin-1 opening and SNARE-complex assembly underlies the central role of UNC-13-Munc13s in synaptic-vesicle priming.
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