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https://hdl.handle.net/2440/7693
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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 1939-4586 |
Editor: | Pelham, H.R.B. |
Statement of Responsibility: | 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 |
DOI: | 10.1091/mbc.11.9.3137 |
Published version: | http://dx.doi.org/10.1091/mbc.11.9.3137 |
Appears in Collections: | Aurora harvest 4 Paediatrics publications |
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