Homotypic fusion of early endosomes: SNAREs do not determine fusion specificity

被引:102
作者
Brandhorst, D [1 ]
Zwilling, D [1 ]
Rizzoli, SO [1 ]
Lippert, U [1 ]
Lang, T [1 ]
Jahn, R [1 ]
机构
[1] Max Planck Inst Biophys Chem, Dept Neurobiol, D-37077 Gottingen, Germany
关键词
endocytosis; exocytosis; PC12; cells;
D O I
10.1073/pnas.0511138103
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Membrane fusion in the secretory pathway is mediated by soluble N-ethylmaleimide-sensitive factor attachment receptor (SNARE) proteins. Different fusion steps are thought to be effected by independent sets of SNAREs, but it is unclear whether specificity is determined by an intrinsic specificity of SNARE pairing or by upstream factors. Using a newly developed microscopy-based assay, we have investigated the SNARE specificity of homotypic early endosomal fusion.. We show that early endosomes contain multiple sets of SNAREs, including, in addition to the putative early endosomal SNAREs, those involved in exocytosis and in fusion of late endosomes. We demonstrate that fusion is largely mediated by a complex formed by syntaxin 13, syntaxin 6, vti1a, and VAMP4, whereas the exocytic and late endosomal SNAREs play little or no role in the reaction. In contrast, proteoliposomes reconstituted with early endosomal SNAREs promiscuously fuse with liposomes containing exocytotic or late endosomal SNAREs. We conclude that the specificity of SNARE pairing does not suffice to determine the specificity of organelle fusion.
引用
收藏
页码:2701 / 2706
页数:6
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