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Related Experiment Videos

Yeast Golgi SNARE interactions are promiscuous.

M M Tsui1, D K Banfield

  • 1Department of Biology, The Hong University of Science and Technology, Clearwater Bay, Kowloon, Hong Kong, China.

Journal of Cell Science
|December 11, 1999
PubMed
Summary

This study reveals that yeast SNARE proteins, crucial for vesicle transport, form functionally redundant complexes. These SNARE-SNARE interactions, though seemingly promiscuous, guide specific membrane fusion events in the Golgi apparatus.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Protein transport via vesicle budding and fusion is essential for the secretory pathway.
  • Soluble NSF Attachment Protein REceptor (SNARE) proteins are key mediators of vesicle-target recognition and membrane fusion.

Purpose of the Study:

  • To investigate direct pair-wise interactions among SNARE proteins involved in ER-Golgi and intra-Golgi transport in yeast.
  • To determine the extent of SNARE-SNARE interactions and identify potential functional redundancy in SNARE complexes.

Main Methods:

  • In vitro binding assays using full-length soluble recombinant SNARE proteins (Sed5p, Sft1p, Ykt6p, Vti1p, Gos1p, Sec22p, Bos1p, and Bet1p).
  • Analysis of gene interactions and phenotypes of conditional mutations in specific SNARE genes.

Main Results:

  • The majority of tested SNARE-binary interactions were positive, indicating selective yet somewhat promiscuous binding.
  • Over-expression of Bet1p could bypass the essential requirement for Sft1p, suggesting functional overlap or substitution.
  • Evidence suggests that SNAREs like Sft1p and Ykt6p may participate in multiple trafficking steps.

Conclusions:

  • Functionally redundant Golgi SNARE complexes likely exist in yeast.
  • SNARE-SNARE interactions contribute to the specificity of vesicular transport, but cannot solely explain it.
  • Different combinations of SNAREs form complexes with Sed5p, facilitating multiple steps in ER-Golgi and intra-Golgi trafficking.

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