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Biochim Biophys Acta. 1999 Jan 6;1426(2):275-85.

Processing glycosidases of Saccharomyces cerevisiae.

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McGill Cancer Centre, McGill University, 3655 Drummond Street, Montreal, Que. H3G 1Y6, Canada.


The properties of the N-glycan processing glycosidases located in the endoplasmic reticulum of Saccharomyces cerevisiae are described. alpha-Glucosidase I encoded by CWH41 cleaves the terminal alpha1, 2-linked glucose and alpha-glucosidase II encoded by ROT2 removes the two alpha1,3-linked glucose residues from the Glc3Man9GlcNAc2 oligosaccharide precursor while the alpha1,2-mannosidase encoded by MNS1 removes one specific mannose to form a single isomer of Man8GlcNAc2. Although trimming by these glycosidases is not essential for the formation of N-glycan outer chains, recent studies on mutants lacking these enzymes indicate that alpha-glucosidases I and II play an indirect role in cell wall beta1,6-glucan formation and that the alpha1,2-mannosidase is involved in endoplasmic reticulum quality control. Detailed structure-function studies of recombinant yeast alpha1,2-mannosidase are described that serve as a model for other members of this enzyme family that has been conserved through eukaryotic evolution.

[Indexed for MEDLINE]

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