An α-amylase homologue, aah3, encodes a GPI-anchored membrane protein required for cell wall integrity and morphogenesis in Schizosaccharomyces pombe

Tomotake Morita, Naotaka Tanaka, Akira Hosomi, Yuko Giga-Hama, Kaoru Takegawa

研究成果: Contribution to journalArticle査読

17 被引用数 (Scopus)

抄録

Glycosylphosphatidylinositol (GPI)-anchored proteins are essential for normal cellular morphogenesis and have an additional role in mediating cross-linking of glycoproteins to cell wall glucan in yeast cells. Although many GPI-anchored proteins have been characterized in Saccharomyces cerevisiae, none have been reported for well-characterized GPI-anchored proteins in Schizosaccharomyces pombe to date. Among the putative GPIanchored proteins in S. pombe, four α-amylase homologs (Aah1p-Aah4p) have putative signal sequences and C-terminal GPI anchor addition signals. Disruption of aah3 + resulted in a morphological defect and hypersensitivity to cell wall-degrading enzymes. Biochemical analysis showed that Aah3p is an N-glycosylated, GPI-anchored membrane protein localized in the membrane and cell wall fractions. Conjugation and sporulation were not affected by the aah3 + deletion, but the ascal wall of aah3Δ cells was easily lysed by hydrolases. Expression of aah3 alleles in which the conserved aspartic acid and glutamic acid residues required for hydrolase activity were replaced with alanine residues failed to rescue the morphological and ascal wall defects of aah3Δ cells. Taken together, these results indicate that Aah3p is a GPI-anchored protein and is required for cell and ascal wall integrity in S. pombe.

本文言語英語
ページ(範囲)1454-1463
ページ数10
ジャーナルBioscience, Biotechnology and Biochemistry
70
6
DOI
出版ステータス出版済み - 2006
外部発表はい

All Science Journal Classification (ASJC) codes

  • バイオテクノロジー
  • 分析化学
  • 生化学
  • 応用微生物学とバイオテクノロジー
  • 分子生物学
  • 有機化学

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