Class of enzymes
D-Man-alpha-(1- ;3) -D-Glc-beta-(1- ;4) -D-Glc-alpha-1-diphosphoundecaprenol 2-beta-glucuronyltransferase (EC 2.4.1.264, "GumK") is an enzyme with the systematic name "UDP-glucuronate: D-Man-alpha-(1- ;3) -D-Glc-beta-(1- ;4)-D-Glc-alpha-1-diphospho-ditrans,octacis-undecaprenol beta-1,2-glucuronyltransferase". This enzyme catalyses the following chemical reaction:
 UDP-glucuronate + D-Man-alpha-(1- ;3) -D-Glc-beta-(1- ;4) -D-Glc-alpha-1-diphospho-ditrans,octacis-undecaprenol formula_1 UDP + D-GlcA-beta-(1- ;2) -D-Man-alpha-(1- ;3) -D-Glc-beta-(1- ;4) -D-Glc-alpha-1-diphospho-ditrans,octacis-undecaprenol
The enzyme is involved in the biosynthesis of the exopolysaccharides xanthan (in the bacterium "Xanthomonas campestris") and acetan (in the bacterium "Gluconacetobacter xylinus").
References.
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