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Glycobiology, 2000, Vol. 10, No. 10 983-991
© 2000 Oxford University Press

Dolichol phosphate mannose synthase from the filamentous fungus Trichoderma reesei belongs to the human and Schizosaccharomyces pombe class of the enzyme

Joanna S. Kruszewska, Markku Saloheimo2, Andrzej Migdalski, Peter Orlean3, Merja Penttilä2 and Grazyna Palamarczyk1

Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Pawinskiego 5a, 02 106 Warsaw, Poland, 2VTT Biotechnology P.O. Box 1500, FIN-02044 VTT, Finland, and 3University of Illinois, Department of Biochemistry, 600 South Mathews Ave., Urbana, IL 61801, USA

Dolichol phosphate mannose (DPM) synthase activity, which is required in N-glycosylation, O-mannosylation, and glycosylphosphatidylinositol membrane anchoring of protein, has been postulated to regulate the Trichoderma reesei secretory pathway. We have cloned a T.reesei cDNA that encodes a 243 amino acid protein whose amino acid sequence shows 67% and 65% identity, respectively, to the Schizosaccharomyces pombe and human DPM synthases, and which lacks the COOH-terminal hydrophobic domain characteristic of the Saccharomyces cerevisiae class of synthase. The Trichoderma dpm1 (Trdpm1) gene complements a lethal null mutation in the S.pombe dpm1+ gene, but neither restores viability of a S.cerevisiae dpm1-disruptant nor complements the temperature-sensitivity of the S.cerevisiae dpm1-6 mutant. The T.reesei DPM synthase is therefore a member of the "human" class of enzyme. Overexpression of Trdpm1 in a dpm1+::his7/dpm1+ S.pombe diploid resulted in a 4-fold increase in specific DPM synthase activity. However, neither the wild type T.reesei DPM synthase, nor a chimera consisting of this protein and the hydrophobic COOH terminus of the S.cerevisiae DPM synthase, complemented an S.cerevisiae dpm1 null mutant or gave active enzyme when expressed in E.coli. The level of the Trdpm1 mRNA in T.reesei QM9414 strain was dependent on the composition of the culture medium. Expression levels of Trdpm1 were directly correlated with the protein secretory capacity of the fungus.

1 To whom correspondence should be addressed


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