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The Role of Trs65 in the Ypt/Rab Guanine Nucleotide Exchange Factor Function of the TRAPP II Complex
- Source :
- Molecular Biology of the Cell. 18:2533-2541
- Publication Year :
- 2007
- Publisher :
- American Society for Cell Biology (ASCB), 2007.
-
Abstract
- The conserved modular complex TRAPP is a guanine nucleotide exchanger (GEF) for the yeast Golgi Ypt-GTPase gatekeepers. TRAPP I and TRAPP II share seven subunits and act as GEFs for Ypt1 and Ypt31/32, respectively, which in turn regulate transport into and out of the Golgi. Trs65/Kre11 is one of three TRAPP II-specific subunits. Unlike the other two subunits, Trs120 and Trs130, Trs65 is not essential for viability, is conserved only among some fungi, and its contribution to TRAPP II function is unclear. Here, we provide genetic, biochemical, and cellular evidence for the role of Trs65 in TRAPP II function. First, like Trs130, Trs65 localizes to the trans-Golgi. Second, TRS65 interacts genetically with TRS120 and TRS130. Third, Trs65 interacts physically with Trs120 and Trs130. Finally, trs65 mutant cells have low levels of Trs130 protein, and they are defective in the GEF activity of TRAPP II and the intracellular distribution of Ypt1 and Ypt31/32. Together, these results show that Trs65 plays a role in the Ypt GEF activity of TRAPP II in concert with the two other TRAPP II-specific subunits. Elucidation of the role played by Trs65 in intracellular trafficking is important for understanding how this process is coordinated with two other processes in which Trs65 is implicated: cell wall biogenesis and stress response.
- Subjects :
- Saccharomyces cerevisiae Proteins
Protein subunit
Saccharomyces cerevisiae
Vesicular Transport Proteins
Golgi Apparatus
Plasma protein binding
Models, Biological
symbols.namesake
Guanine Nucleotide Exchange Factors
Molecular Biology
biology
Membrane Proteins
Articles
Cell Biology
Golgi apparatus
biology.organism_classification
Transport protein
Cell biology
Protein Subunits
Protein Transport
Phenotype
TRAPP complex
Biochemistry
rab GTP-Binding Proteins
Mutation
symbols
biology.protein
Guanine nucleotide exchange factor
Rab
Protein Binding
Subjects
Details
- ISSN :
- 19394586 and 10591524
- Volume :
- 18
- Database :
- OpenAIRE
- Journal :
- Molecular Biology of the Cell
- Accession number :
- edsair.doi.dedup.....0fec5271cd8458b549208e4f17d45130
- Full Text :
- https://doi.org/10.1091/mbc.e07-03-0221