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The Q nucleosides isolated from rabbit liver tRNA are known to have sugars (mannose or galactose) linked to their cyclopentene diol moiety. A Q nucleoside containing mannose (manQ) was synthesized by a cell-free system from rat liver, using purified E. coli tRNAAsp as an acceptor and GDP-mannose as a donor molecule. The novel mannosyltransferase catalyzing this reaction was purified from a particulate-free soluble enzyme fraction and found to be strictly specific for tRNAAsp. These results, together with the anomeric configuration of mannose in Q nucleoside, indicate that no lipid intermediate is involved in the biosynthesis of Q nucleoside.

nucleic acids research

Enzymatic synthesis of Q<sup>*</sup>nucleoside containing mannose in the anticodon of tRNA: isolation of a novel mannosyltransferase from a cell-free extract of rat liver

Enzymatic synthesis of Q*nucleoside containing mannose in the anticodon of tRNA: isolation of a novel mannosyltransferase from a cell-free extract of rat liver

Enzymatic synthesis of Q^*nucleoside containing mannose in the anticodon of tRNA: isolation of a novel mannosyltransferase from a cell-free extract of rat liver