Human and Saccharomyces cerevisiae dolichol phosphate mannose synthases represent two classes of the enzyme, but both function in Schizosaccharomyces pombe

Paul A. Colussi, Christopher H. Taron, Jamey C. Mack, Peter Orlean

Research output: Contribution to journalArticlepeer-review

Abstract

Dolichol phosphate mannose (Dol-P-Man), formed upon transfer of Man from GDPMan to Dol-P, is a mannosyl donor in pathways leading to N-glycosylation, glycosyl phosphatidylinositol membrane anchoring, and O-mannosylation of protein. Dol-P-Man synthase is an essential protein in Saccharomyces cerevisiae. We have cloned cDNAs encoding human and Schizosaccharomyces pombe proteins that resemble S. cerevisiae Dol-P-Man synthase. Disruption of the gene for the S. pombe Dol-P-Man synthase homolog, dpm1+, is lethal. The known Dol-P-Man synthase sequences can be divided into two classes. One contains the S. cerevisiae, Ustilago maydis, and Trypanosoma brucei enzymes, which have a COOH-terminal hydrophobic domain, and the other contains the human, S. pombe, and Caenorhabditis synthases, which lack a hydrophobic COOH- terminal domain. The two classes of synthase are functionally equivalent, because S. cerevisiae DPM1 and its human counterpart both complement the lethal null mutation in S. pombe dpm1+. The findings that Dol-P-Man synthase is essential in yeast and that the Ustilago and Trypanosoma synthases are in a different class from the human enzyme raise the possibility that Dot-P-Man synthase could be exploited as a target for inhibitors of pathogenic eukaryotic microbes.

Original languageEnglish (US)
Pages (from-to)7873-7878
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume94
Issue number15
DOIs
StatePublished - Jul 22 1997

ASJC Scopus subject areas

  • General

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