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Reference: Li B and Warner JR (1998) Genetic interaction between YPT6 and YPT1 in Saccharomyces cerevisiae. Yeast 14(10):915-22

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Abstract

Ypt6p, the yeast homologue of human RAB6, is required for protein trafficking at elevated temperatures. Biochemical data provide evidence that Ypt6p plays a role in an early step(s) of the secretory pathway: from ER to Golgi, or from cis to medial Golgi, or both. Here we show that overexpression of YPT1 suppresses the growth and secretion defects of a ypt6 temperature-sensitive (ts) strain. SLY1-20, encoding a dominant mutant allele that suppresses the lethal effect of YPT1, also suppresses the growth defect of a ypt6 ts strain. Conversely, SSD1, isolated as a suppressor of ypt6 ts, can suppress the growth defect of a ypt1 ts allele. These data suggest that Ypt6p has some redundant function with Ypt1p. However, overexpression of Ypt6p is toxic to a ypt1 ts strain, although it does not affect the growth of wild-type cells, suggesting that Ypt6p may sequester proteins shared with Ypt1p. This genetic evidence confirms the conclusion that Ypt6p is involved in an early step of the secretory pathway.

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Journal Article
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Li B, Warner JR
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