Medizinische Universität Graz Austria/Österreich - Forschungsportal - Medical University of Graz
Gewählte Publikation:
SHR Neuro Krebs Kardio Lipid Stoffw Microb
Williams, AL; Ehm, S; Jacobson, NC; Xu, D; Hay, JC.
rsly1 binding to syntaxin 5 is required for endoplasmic reticulum-to-Golgi transport but does not promote SNARE motif accessibility.
Mol Biol Cell. 2004; 15(1):162-175
Doi: 10.1091/mbc.E03-07-0535
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- Führende Autor*innen der Med Uni Graz
- Hay Jesse
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- Abstract:
- Although some of the principles of N-ethylmaleimide-sensitive factor attachment protein receptor (SNARE) function are well understood, remarkably little detail is known about sec1/munc18 (SM) protein function and its relationship to SNAREs. Popular models of SM protein function hold that these proteins promote or maintain an open and/or monomeric pool of syntaxin molecules available for SNARE complex formation. To address the functional relationship of the mammalian endoplasmic reticulum/Golgi SM protein rsly1 and its SNARE binding partner syntaxin 5, we produced a conformation-specific monoclonal antibody that binds only the available, but not the cis-SNARE-complexed nor intramolecularly closed form of syntaxin 5. Immunostaining experiments demonstrated that syntaxin 5 SNARE motif availability is nonuniformly distributed and focally regulated. In vitro endoplasmic reticulum-to-Golgi transport assays revealed that rsly1 was acutely required for transport, and that binding to syntaxin 5 was absolutely required for its function. Finally, manipulation of rsly1-syntaxin 5 interactions in vivo revealed that they had remarkably little impact on the pool of available syntaxin 5 SNARE motif. Our results argue that although rsly1 does not seem to regulate the availability of syntaxin 5, its function is intimately associated with syntaxin binding, perhaps promoting a later step in SNARE complex formation or function.
- Find related publications in this database (using NLM MeSH Indexing)
- Animals -
- Antibodies, Monoclonal - pharmacology
- Carrier Proteins - metabolism
- Cells, Cultured -
- Cloning, Molecular -
- Endoplasmic Reticulum - metabolism
- Golgi Apparatus - metabolism
- Immediate-Early Proteins - metabolism
- Membrane Proteins - metabolism
- Microscopy, Fluorescence -
- Models, Molecular -
- Munc18 Proteins -
- Protein Binding - drug effects
- Protein Structure, Tertiary - physiology
- Protein Transport - physiology
- Qa-SNARE Proteins -
- Rats -
- SNARE Proteins -
- Vesicular Transport Proteins -