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. 1975 Feb;146(2):299–307. doi: 10.1042/bj1460299

Glycosylation of ribonuclease A catalysed by rabbit liver extracts.

Z Khalkhall, R D Marshall
PMCID: PMC1165306  PMID: 1156375

Abstract

Crude extracts of rabbit liver catalyse in vitro the transfer of N-acetylglucosamine from UDP-N-acetylglucosamine to bovine pancreatic ribonuclease A. The enzymic activity is contained in rough endoplasmic reticulum. It has an absolute requirement for a bivalent metal ion: Co-2+ greater than Mn-2+ greater than Ni-2+. Mg-2+ is ineffective. There is enzymic activity in the absence of detergent, but increased activity is observed in the presence of Triton X-100. The site of glycosylation of ribonuclease A is asparagine-34, and glycosylation occurs only at this point. These findings agree with the hypothesis that the sequence Asn-X-Thr(Ser) (where X may be one of a number of types of amino acid) is a necessary, but not sufficient, condition for N-acetylglucosaminylation of a protein-bound asparagine residue.

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Selected References

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