Structural analysis of α1,3-linked galactose-containing oligosaccharides in Schizosaccharomyces pombe mutants harboring single and multiple α-galactosyltransferase genes disruptions

Takao Ohashi, Shin Ichi Nakakita, Wataru Sumiyoshi, Naotaka Yamada, Yuka Ikeda, Naotaka Tanaka, Kaoru Takegawa

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

In the fission yeast Schizosaccharomyces pombe, galactose (Gal) residues are transferred to N- and O-linked oligosaccharides of glycoproteins by galactosyltransferases in the lumen of the Golgi apparatus. In S. pombe, the major in vitro α1,2-galactosyltransferase activity has been purified, the gma12+ gene has been cloned, and three α-galactosyltransferase genes (gmh1+-gmh3+) have also been partially characterized. In this study, we found three additional uncharacterized genes with homology to gmh1+ (gmh4+- gmh6+) in the fission yeast genome sequence. All possible single disruption mutants and the septuple disruption strain were constructed and characterized. The electrophoretic mobility of acid phosphatase prepared from gma12δ, gmh2δ, gmh3δ and gmh6δ mutants was higher than that from wild type, indicating that Gma12p, Gmh2p, Gmh3p and Gmh6p are required for the galactosylation of N-linked oligosaccharides. High-performance liquid chromatography (HPLC) analysis of pyridylaminated O-linked oligosaccharides from each single mutant showed that Gma12p, Gmh2p and Gmh6p are involved in galactosylation of O-linked oligosaccharides. The septuple mutant exhibited similar drug and temperature sensitivity as a gms1δ mutant that is incapable of galactosylation. Oligosaccharide structural analysis based on HPLC and methylation analysis revealed that the septuple mutant still contained oligosaccharides consisting of α1,3-linked Gal residues, indicating that an unknown α1,3-galactosyltransferase activity was still present in the septuple mutant.

Original languageEnglish
Pages (from-to)340-351
Number of pages12
JournalGlycobiology
Volume21
Issue number3
DOIs
Publication statusPublished - Mar 1 2011

All Science Journal Classification (ASJC) codes

  • Biochemistry

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