Schizosaccharomyces pombe Sst4p, a conserved Vps27/Hrs homolog, functions downstream of phosphatidylinositol 3-kinase Pik3p to mediate proper spore formation

Masayuki Onishi, Michihiro Iida, Takako Koga, Sadayuki Yamada, Aiko Hirata, Tomoko Iwaki, Kaoru Takegawa, Yasuhisa Fukui, Hiroyuki Tachikawa

研究成果: ジャーナルへの寄稿学術誌査読

7 被引用数 (Scopus)

抄録

Sporulation of the fission yeast Schizosaccharomyces pombe is a developmental process that generates gametes and that includes the formation of spore envelope precursors called the forespore membranes. Assembly and development of forespore membranes require vesicular trafficking from other intracellular membrane compartments. We have shown that phosphatidylinositol 3-kinase (PtdIns 3-kinase) is required for efficient and proper development of forespore membranes. The role of a FYVE domain protein, Sst4p, a homolog of Vps27p/Hrs, as a downstream factor for PtdIns 3-kinase in sporulation was investigated. sst4Δ asci formed spores with oval-shaped morphology and with reduced viability compared to that of the wild-type spores. The extension of forespore membranes was inefficient, and bubble-like structures emerged from the leading edges of the forespore membranes. Sst4p localization was examined using fluorescent protein fusions and was found to be adjacent to the forespore membranes during sporulation. The localization and function of Sst4p were dependent on its FYVE domain and on PtdIns 3-kinase. Sst4p colocalized and interacted with Hse1p, a homolog of Saccharomyces cerevisiae Hse1p and of mammalian STAM. Mutations in all three UIM domains of the Sst4p/Hse1p complex resulted in formation of spores with abnormal morphology. These results suggest that Sst4p is a downstream factor of PtdIns 3-kinase and functions in forespore membrane formation.

本文言語英語
ページ(範囲)2343-2353
ページ数11
ジャーナルEukaryotic Cell
6
12
DOI
出版ステータス出版済み - 12月 2007
外部発表はい

!!!All Science Journal Classification (ASJC) codes

  • 微生物学
  • 分子生物学

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