Biochemistry, molecular biology, and genetics of the oligosaccharyltransferase
UMass Chan Affiliations
Department of Biochemistry and Molecular BiologyDocument Type
Journal ArticlePublication Date
1996-06-01Keywords
AnimalsCarbohydrate Sequence
Forecasting
Glycosylation
*Hexosyltransferases
Humans
*Membrane Proteins
Molecular Sequence Data
Phenotype
Saccharomyces cerevisiae
Transferases
Life Sciences
Medicine and Health Sciences
Metadata
Show full item recordAbstract
Asparagine-linked glycosylation is a highly conserved protein modification reaction that occurs in all eukaryotes. The initial stage in the biosynthesis of N-linked glycoproteins, catalyzed by the enzyme oligosaccharyltransferase (OST), involves the transfer of a preassembled high-mannose oligosaccharide from a dolichol-linked oligosaccharide donor onto asparagine acceptor sites in nascent proteins in the lumen of the rough endoplasmic reticulum. Biochemical, molecular biological, and genetic studies conducted during the past 5 years have resulted in an explosive growth in our knowledge concerning the OST. Although the basic biochemical properties of the enzyme were determined more than a decade ago using intact microsomal membranes, recent studies provide novel insight into the catalytic mechanism of the enzyme. The OST was recently purified as a large heteroligomeric membrane protein complex; the sequences of many of the subunits have been determined from both fungal and vertebrate sources. Consistent with the evolutionary conservation of N-linked glycosylation, protein sequence comparisons reveal significant homologies between vertebrate, invertebrate, plant, and fungal OST subunits. Yeast molecular genetic methods have been instrumental in the functional characterization of the OST subunits, and have proven to be powerful tools for the identification of novel gene products that influence oligosaccharide transfer in vivo.Source
FASEB J. 1996 Jun;10(8):849-58.
DOI
10.1096/fasebj.10.8.8666161Permanent Link to this Item
http://hdl.handle.net/20.500.14038/42198PubMed ID
8666161Related Resources
ae974a485f413a2113503eed53cd6c53
10.1096/fasebj.10.8.8666161