Kyossev Z, Bergmann B, Ossikovski E, Walter RD. N-acetylglucosaminyltransferase from Ascaris suum.
Int J Parasitol 1991;
21:703-6. [PMID:
1836781 DOI:
10.1016/0020-7519(91)90082-i]
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Abstract
The occurrence of N-acetylglucosaminyltransferase, the initial step in the synthesis of the carbohydrate moiety of N-linked glycoproteins, is demonstrated in the microsomal fraction of the nematode Ascaris suum. Phosphatidylglycerol stimulated enzyme activity three- to six-fold without affecting the Km values of either substrates, uridinediphospho-N-acetylglucosamine or dolichylphosphate. The Km values were determined to be about 12 microM and 100 micrograms ml-1, respectively. The enzyme activity was strongly inhibited by tunicamycin acting as a competitive inhibitor with respect to the substrate uridinediphospho-N-glucosamine.
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