VAP-A Binds Promiscuously to both v- and tSNAREs
pmid: 11511104
VAP-A Binds Promiscuously to both v- and tSNAREs
Proteins that bind to SNAREs may regulate their function. One such protein, VAP-33, was first discovered in Aplysia californica and has two mammalian homologues, VAP-A and VAP-B. VAP-A has been implicated in vesicle targeting to the plasma membrane based on its location in polarized cells and its ability to bind VAMP in vitro. Here, we demonstrate that VAP-A is a widely expressed resident of the ER/Golgi intermediate compartment in COS-7 cells. Moreover, we demonstrate that VAMP-binding and VAP-dimerization require both the N- and C-terminal domains of VAP-A and also that VAP-A binds to a wide range of SNAREs and fusion-related proteins including syntaxin 1A, rbet1, rsec22, alphaSNAP, and NSF. Together, these results suggest that VAP-A is not a regulator of a specific VAMP, but rather may play a more general role in SNARE-mediated vesicle traffic between the ER and Golgi in nonpolarized cells.
- Hospital for Sick Children Canada
- University of Toronto Canada
Vesicular Transport Proteins, Golgi Apparatus, Membrane Proteins, Syntaxin 1, Nerve Tissue Proteins, Endoplasmic Reticulum, Cell Line, R-SNARE Proteins, Soluble N-Ethylmaleimide-Sensitive Factor Attachment Proteins, Antigens, Surface, COS Cells, Animals, Humans, Tissue Distribution, Qc-SNARE Proteins, Carrier Proteins, Transport Vesicles, Dimerization, N-Ethylmaleimide-Sensitive Proteins
Vesicular Transport Proteins, Golgi Apparatus, Membrane Proteins, Syntaxin 1, Nerve Tissue Proteins, Endoplasmic Reticulum, Cell Line, R-SNARE Proteins, Soluble N-Ethylmaleimide-Sensitive Factor Attachment Proteins, Antigens, Surface, COS Cells, Animals, Humans, Tissue Distribution, Qc-SNARE Proteins, Carrier Proteins, Transport Vesicles, Dimerization, N-Ethylmaleimide-Sensitive Proteins
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