Targeting of SNAP-25 to Membranes Is Mediated by Its Association with the Target SNARE Syntaxin*

The docking and fusion of synaptic vesicles with the presynaptic plasma membrane require the interaction of the vesicle-associated membrane protein VAMP with the plasma membrane proteins syntaxin and SNAP-25. Both of these proteins behave as integral membrane proteins, although they are unusual in that they insert into membranes post-translationally. Whereas VAMP and syntaxin possess hydrophobic transmembrane domains, SNAP-25 does not, and it is widely believed that SNAP-25 traffics to and inserts into membranes by post-translational palmitoylation. In pulse-chase biosynthesis studies, we now show that SNAP-25 and syntaxin rapidly bind to each other while still in the cytosol of neuroendocrine and transfected heterologous cells. Cell fractionation studies revealed that cytosolic SNAP-25·syntaxin complexes then traffic to and insert into membranes. Furthermore, the association of SNAP-25 with membranes is dramatically enhanced by syntaxin, and the transmembrane domain of syntaxin is essential for this effect. Surprisingly, despite the importance of the SNAP-25 palmitoylation domain for membrane anchoring at steady state, removal of this domain did not inhibit the initial association of newly synthesized SNAP-25 with membranes in the presence of syntaxin. These data demonstrate that the initial attachment of newly synthesized SNAP-25 to membranes is a consequence of its association with syntaxin and that it is only after syntaxin-mediated membrane tethering that SNAP-25 is palmitoylated.

• Publication year

  2000

• Venue

  Journal of Biological Chemistry

• Publication date

  2000-01-28

• Fields of study

  Biology, Medicine, Chemistry

• Identifiers
  DOI 10.1074/jbc.275.4.2959PMID 10644766
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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