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Type: Journal article
Title: Syntaxin 7 is localized to late endosome compartments, associates with Vamp 8, and is required for late endosome-lysosome fusion
Author: Mullock, B.
Smith, C.
Ihrke, G.
Bright, N.
Lindsay, M.
Parkinson, E.
Brooks, D.
Parton, R.
James, D.
Luzio, J.
Piper, R.
Citation: Molecular Biology of the Cell, 2000; 11(9):3137-3153
Publisher: Amer Soc Cell Biology
Issue Date: 2000
ISSN: 1059-1524
Statement of
Barbara M. Mullock, Chez W. Smith, Gudrun Ihrke, Nicholas A. Bright, Margaret Lindsay, Emma J. Parkinson, Doug A. Brooks, Robert G. Parton, David E. James, J. Paul Luzio, and Robert C. Piper
Abstract: Protein traffic from the cell surface or the trans-Golgi network reaches the lysosome via a series of endosomal compartments. One of the last steps in the endocytic pathway is the fusion of late endosomes with lysosomes. This process has been reconstituted in vitro and has been shown to require NSF, alpha and gamma SNAP, and a Rab GTPase based on inhibition by Rab GDI. In Saccharomyces cerevisiae, fusion events to the lysosome-like vacuole are mediated by the syntaxin protein Vam3p, which is localized to the vacuolar membrane. In an effort to identify the molecular machinery that controls fusion events to the lysosome, we searched for mammalian homologues of Vam3p. One such candidate is syntaxin 7. Here we show that syntaxin 7 is concentrated in late endosomes and lysosomes. Coimmunoprecipitation experiments show that syntaxin 7 is associated with the endosomal v-SNARE Vamp 8, which partially colocalizes with syntaxin 7. Importantly, we show that syntaxin 7 is specifically required for the fusion of late endosomes with lysosomes in vitro, resulting in a hybrid organelle. Together, these data identify a SNARE complex that functions in the late endocytic system of animal cells.
Keywords: Liver; Kidney; Cell Line; Intracellular Membranes; Endosomes; Lysosomes; trans-Golgi Network; Epithelial Cells; Animals; Dogs; Rats; Saccharomyces cerevisiae; Membrane Proteins; Endocytosis; Membrane Fusion; R-SNARE Proteins; Qa-SNARE Proteins
RMID: 0001000533
DOI: 10.1091/mbc.11.9.3137
Appears in Collections:Paediatrics publications

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