Abstract
We identified the ORF YBR264c during the systematic sequencing of the Saccharomyces cerevisiae genome. It encodes a putative protein of 218 amino acids. We demonstrate here that the gene is indeed expressed and encodes a new Ypt in yeast. This protein specifically binds guanine nucleotides and interacts via its C-terminal end with the unique Rab GDP Dissociation Inhibitor (RabGDI). In accordance with a recent proposal, the gene is now designated YPT10. No mutant phenotype could be associated with inactivation of the gene. However, overexpression of YPT10 resulted in defects in growth; microscopic examination of such cells revealed an overabundance of vesicular and tubular structures, suggesting some alteration in the function of the Golgi apparatus. In addition, degradation of the Ypt10 protein, which possesses a PEST sequence, is shown to be dependent on proteasome activity.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Amino Acid Sequence
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Cysteine Endopeptidases / metabolism*
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GTP Phosphohydrolases / genetics*
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GTP Phosphohydrolases / metabolism
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GTP-Binding Proteins / chemistry
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GTP-Binding Proteins / genetics*
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GTP-Binding Proteins / metabolism*
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Genotype
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Guanine Nucleotide Dissociation Inhibitors*
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Guanosine Triphosphate / metabolism
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Molecular Sequence Data
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Multienzyme Complexes / metabolism*
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Open Reading Frames*
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Proteasome Endopeptidase Complex
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Saccharomyces cerevisiae / genetics*
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Saccharomyces cerevisiae / metabolism
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Saccharomyces cerevisiae / ultrastructure
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Saccharomyces cerevisiae Proteins*
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Sequence Alignment
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Sequence Homology, Amino Acid
Substances
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GDP dissociation inhibitor 1
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Guanine Nucleotide Dissociation Inhibitors
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Multienzyme Complexes
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Saccharomyces cerevisiae Proteins
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Ypt10 protein, S cerevisiae
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Guanosine Triphosphate
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Cysteine Endopeptidases
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Proteasome Endopeptidase Complex
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GTP Phosphohydrolases
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GTP-Binding Proteins