Ontology: Molecular Function (GO:0000033)

Definition: Catalysis of the transfer of a mannose residue to an oligosaccharide, forming an alpha-(1->3) linkage.

View Ontology: (graph) | (text)

This table lists the methods used to annotate genes either directly to the term alpha-1,3-mannosyltransferase activity (5 genes) or to its variants containing one or more qualifiers (0 genes). Note that some genes may have been annotated by more than one method so the numbers in the table below may not add up to the totals given here.

Annotation Method	GO Term	# Yeast Genes Annotated
Manually curated (download data)	alpha-1,3-mannosyltransferase activity	5
High-throughput	none	none
Computational	none	none

Links to Additional Annotations:

• View annotations in multiple organisms using
• Search for S. cerevisiae genes annotated, by the Manually curated or High-throughput methods, to this term or to any terms that are descended from this term, i.e., child terms representing more specific biology than this term.

Annotation details for genes that have been directly annotated to the term alpha-1,3-mannosyltransferase activity or its variants containing one or more qualifiers (NOT, contributes to, or colocalizes with).

alpha-1,3-mannosyltransferase activity      5 genes directly annotated to this term
Locus	Evidence	Annotation Method	Reference	Assigned By
ALG3/YBL082C	IDA: Inferred from Direct Assay, IMP: Inferred from Mutant Phenotype Assigned on 2002-12-20	manually curated	Sharma CB, et al.  (2001) Biosynthesis of lipid-linked oligosaccharides in yeast: the ALG3 gene encodes the Dol-P-Man:Man5GlcNAc2-PP-Dol mannosyltransferase. Biol Chem 382(2):321-8	SGD
MNN1/YER001W	IMP: Inferred from Mutant Phenotype Assigned on 2001-01-18	manually curated	Yip CL, et al.  (1994) Cloning and analysis of the Saccharomyces cerevisiae MNN9 and MNN1 genes required for complex glycosylation of secreted proteins. Proc Natl Acad Sci U S A 91(7):2723-7	SGD
MNT2/YGL257C	IDA: Inferred from Direct Assay Assigned on 2001-01-18	manually curated	Romero PA, et al.  (1999) Mnt2p and Mnt3p of Saccharomyces cerevisiae are members of the Mnn1p family of alpha-1,3-mannosyltransferases responsible for adding the terminal mannose residues of O-linked oligosaccharides. Glycobiology 9(10):1045-51	SGD
MNT3/YIL014W	IDA: Inferred from Direct Assay Assigned on 2001-01-18	manually curated	Romero PA, et al.  (1999) Mnt2p and Mnt3p of Saccharomyces cerevisiae are members of the Mnn1p family of alpha-1,3-mannosyltransferases responsible for adding the terminal mannose residues of O-linked oligosaccharides. Glycobiology 9(10):1045-51	SGD
MNT4/YNR059W	IDA: Inferred from Direct Assay Assigned on 2001-01-18	manually curated	Romero PA, et al.  (1999) Mnt2p and Mnt3p of Saccharomyces cerevisiae are members of the Mnn1p family of alpha-1,3-mannosyltransferases responsible for adding the terminal mannose residues of O-linked oligosaccharides. Glycobiology 9(10):1045-51	SGD

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