Hemifusion in SNARE-mediated membrane fusion

SNAREs are essential for intracellular membrane fusion. Using EPR, we determined the structure of the transmembrane domain (TMD) of the vesicle (v)-SNARE Snc2p involved in trafficking in yeast. Structural features of the TMD were used to design a v-SNARE mutant in which about half of the TMD was del...

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Veröffentlicht in:Nature structural & molecular biology 2005-05, Vol.12 (5), p.417-422
Hauptverfasser: Shin, Yeon-Kyun, Xu, Yibin, Zhang, Fan, Su, Zengliu, McNew, James A
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Sprache:eng
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Zusammenfassung:SNAREs are essential for intracellular membrane fusion. Using EPR, we determined the structure of the transmembrane domain (TMD) of the vesicle (v)-SNARE Snc2p involved in trafficking in yeast. Structural features of the TMD were used to design a v-SNARE mutant in which about half of the TMD was deleted. Liposomes containing this mutant induced outer leaflet mixing but not inner leaflet mixing when incubated with liposomes containing target membrane (t)-SNAREs. Hemifusion was also detected with wild-type SNAREs when low protein concentrations were reconstituted. Thus, these results show that SNARE-mediated fusion can transit through a hemifusion intermediate.
ISSN:1545-9993
1545-9985
DOI:10.1038/nsmb921