Reference: Devlin C and Ballou CE (1990) Identification and characterization of a gene and protein required for glycosylation in the yeast Golgi. Mol Microbiol 4(11):1993-2001

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Abstract

The MNN2 gene of Saccharomyces cerevisiae has been cloned by complementation of the mnn2 mutant phenotype scored by a change in cell surface carbohydrate structure resulting from a lack of alpha 1----2-mannose branching in the outer chain. The gene was subcloned as a3 kb DNA fragment that integrated at the MNN2 locus, and a gene disruption yielded the mnn2 phenotype. A lacZ-MNN2 gene fusion protein, produced in Escherichia coli, was used to raise a specific antiserum that recognizeda 65 kD wild-type yeast protein. This MNN2 gene product lacks N-linked carbohydrate but appears to be an integral membrane protein. Overproduction of MNN2p does not enhance the alpha 1----2-mannosyltransferase activity of yeast cells. The results suggest that MNN2p is a Golgi-associated protein that is involved in mannoprotein sorting rather than glycosylation.

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Journal Article
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Devlin C, Ballou CE
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