Reference: Köhler JR (2003) Mos10 (Vps60) is required for normal filament maturation in Saccharomyces cerevisiae. Mol Microbiol 49(5):1267-85

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Abstract


Early pseudohyphal growth of Saccharomyces cerevisiae is well described, and is known to be subject to a complex web of developmental regulation. In maturing filaments, young cells differ significantly from their pseudohyphal progenitors, in their shape, and in their timing and direction of cell division. The changes that occur during filament maturation result in round and oval cells surrounding and covering the pseudohyphal filament. In a screen for mutants that affect this process, a vacuolar protein sorting gene, MOS10 (VPS60), and a gene encoding an alpha subunit of the proteasome core, PRE9, were isolated. Characterization of the mos10/mos10 phenotype showed that the process of filament maturation is regulated differently from early filamentous growth, and that the requirement for Mos10 is limited to the maturation stage of pseudohyphal development. The mos10/mos10 phenotype is unlikely to be an unspecific effect of disruption of endocytosis or vacuolar protein sorting, because it is not recapitulated by mutants in other genes required for these processes. Disruption of homologues of MOS10, which act as components of the ESCRT-III complex in targeting proteins for vacuolar degradation, results in abnormal early pseudohyphal growth, not in the filament maturation defect seen in mos10/mos10. Thus, Mos10 may function in targeting of specific cargo proteins for degradation, under conditions particular to maturing filaments.

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Journal Article | Research Support, U.S. Gov't, P.H.S.
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Köhler JR
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