GDP-mannose:cellobiosyl-diphosphopolyprenol alpha-mannosyltransferase (, GumH, AceA, alpha1,3-mannosyltransferase AceA) is an enzyme with systematic name GDP-mannose:D-Glc-beta-(1->4)-Glc-alpha-1-diphospho-ditrans,octacis-undecaprenol 3-alpha-mannosyltransferase . This enzyme catalyses the following chemical reaction
GDP-mannose + D-Glc-beta-(1->4)-Glc-alpha-1-diphospho-ditrans,octacis-undecaprenol GDP + D-Man-alpha-(1->3)-D-Glc-beta-(1->4)-D-Glc-alpha-1-diphospho-ditrans,octacis-undecaprenol
In the bacterium Gluconacetobacter xylinus the enzyme is involved in the biosynthesis of the exopolysaccharide acetan.
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