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[Mitochondrial N-acetylglucosaminyl transferase connected with viral infection].

A higher level of N-acetylglucosamine incorporation by proteinic and polyprenic endogenous acceptors is observed after infection by Myxovirus. This phenomenon occurs in whole mitochondria as in outer mitochondrial membranes, where it is particularly obvious with proteinic endogenous acceptors. Under viral infection, no new N-acetylglucosaminylated polyprenol is detected. In the case of infected animals as in the case of control animals, compounds P1 (extracted by chloroform/methanol 2:1) are identified by thin layer chromatography as a N-acetylglucosamyl-pyrophosphoryl-dolichol and a N, N'-diacetylchitobiosyl-pyrophosphoryl-dolichol. In the case of infected animals, biosynthesis of proteinic acceptors and dolichol is not modified; therefore the increase of N-acetylglucosamine incorporation is not due to a modification of the endogenous acceptors level. By the use of exogenous dolichol-monophosphate we demonstrate that the increased transfer of [14C] N-acetylglucosamine into polyprenic acceptors is the result of a higher activity of the mitochondrial N-acetylglucosaminyltransferase after viral infection.