Countercurrent Distribution of Two Distinct SNARE Complexes Mediating Transport within the Golgi Stack Academic Article uri icon


MeSH Major

  • Golgi Apparatus
  • Vesicular Transport Proteins


  • Genetic and biochemical evidence has established that a SNARE complex consisting of syntaxin 5 (Sed5)-mYkt6 (Ykt6)-GOS28 (Gos1)-GS15 (Sft1) is required for transport of proteins across the Golgi stack in animals (yeast). We have utilized quantitative immunogold labeling to establish the cis-trans distribution of the v-SNARE GS15 and the t-SNARE subunits GOS28 and syntaxin 5. Whereas the distribution of the t-SNARE is nearly even across the Golgi stack from the cis to the trans side, the v-SNARE GS15 is present in a gradient of increasing concentration toward the trans face of the stack. This contrasts with a second distinct SNARE complex, also required for intra-Golgi transport, consisting of syntaxin 5 (Sed5)-membrin (Bos1)-ERS24 (Sec22)-rBet1 (Bet1), whose v-(rBet1) and t-SNARE subunits (membrin and ERS24), progressively decrease in concentration toward the trans face. Transport within the stack therefore appears to utilize countercurrent gradients of two Golgi SNAREpins and may involve a mechanism akin to homotypic fusion.

publication date

  • April 2004



  • Academic Article



  • eng

PubMed Central ID

  • PMC379251

Digital Object Identifier (DOI)

  • 10.1091/mbc.E03-08-0625

PubMed ID

  • 14742712

Additional Document Info

start page

  • 1506

end page

  • 18


  • 15


  • 4