Galactosylation of cell-surface glycoprotein required for hyphal growth and cell wall integrity in Schizosaccharomyces japonicus

Takamasa Fukunaga, Takao Ohashi, Yutaka Tanaka, Tomoki Yoshimatsu, Yujiro Higuchi, Hiromi Maekawa, Kaoru Takegawa

研究成果: ジャーナルへの寄稿学術誌査読


Schizosaccharomyces japonicus is a dimorphic yeast, transiting between unicellular and hyphal growth. The glycoproteins of fission yeast contain, in addition to mannose (Man), a large number of galactose (Gal) residues. Previously, we reported that the cell-surface O-glycans of S. japonicus comprise mainly tri-saccharides (Gal-Man-Man) as a main component, in contrast to the tetra-saccharides observed in other Schizosaccharomyces species. Here we have investigated the function of cell-surface Gal residues in S. japonicus. Because disruption of gms1+, encoding the UDP-Gal transporter required for galactomannan synthesis, abolishes cell-surface galactosylation in Schizosaccharomyces pombe, we constructed a deletion mutant of the homologous gene in S. japonicus gms1Δ [gms1 (S.j)] and determined the N- and O-linked oligosaccharide structures present on the cell surface. Disruption of gms1 (S.j) resulted in a complete lack of Gal on the cell surface, indicating that Gms1 plays an essential role in supplying UDP-Gal from the cytoplasm to the Golgi lumen. Analytical microscopy of gms1Δ demonstrated that the lack of cell-surface Gal did not affect cell growth or morphology during vegetative growth. However, hyphal development was blocked in gms1Δ, even in the presence of the topoisomerase I inhibitor camptothecin, which is known to induce hyphal differentiation in wild-type S. japonicus. Collectively, these findings show that Gal-containing oligosaccharides are required for cell wall integrity during filamentous growth in S. japonicus.

ジャーナルJournal of Bioscience and Bioengineering
出版ステータス印刷中 - 2022

!!!All Science Journal Classification (ASJC) codes

  • バイオテクノロジー
  • バイオエンジニアリング
  • 応用微生物学とバイオテクノロジー


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