Characterization of O-mannosyltransferase family in Schizosaccharomyces pombe

Naotaka Tanaka, Yasuko Fujita, Shotaro Suzuki, Masayo Morishita, Yuko Giga-Hama, Chikashi Shimoda, Kaoru Takegawa

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

Protein O-glycosylation is an essential protein modification in eukaryotic cells. In Saccharomyces cerevisiae, O-mannosylation is initiated in the lumen of the endoplasmic reticulum by O-mannosyltransferase gene products (Pmt1p-7p). A search of the Schizosaccharomyces pombe genome database revealed a total of three O-glycoside mannosyltransferase homologs (ogm1+, ogm2 +, and ogm4+), closely related to Saccharomyces cerevisiae PMT1, PMT2, and PMT4. Although individual ogm genes were not found to be essential, ogm1Δ and ogm4Δ mutants exhibited aberrant morphology and failed to agglutinate during mating. The phenotypes of the ogm4Δ mutant were not complemented by overexpression of ogm1+ or ogm2+, suggesting that each of the Ogm proteins does not have overlapping functions. Heterologous expression of a chitinase from S. cerevisiae in the ogm mutants revealed that O-glycosylation of chitinase had decreased in ogm1Δ cells. A GFP-tagged Fus1p from S. cerevisiae was specifically not glycosylated and accumulated in the Golgi in ogm4Δ cells. These results indicate that O-glycosylation initiated by Ogm proteins plays crucial physiological roles and can serve as a sorting determinant for protein transport of membrane glycoproteins in S. pombe.

Original languageEnglish
Pages (from-to)813-820
Number of pages8
JournalBiochemical and Biophysical Research Communications
Volume330
Issue number3
DOIs
Publication statusPublished - May 13 2005
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology

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