cellulose synthase (UDP-forming) activity

Catalysis of the reaction: UDP-glucose + ((1,4)-beta-D-glucosyl)(n) = UDP + ((1,4)-beta-D-glucosyl)(n+1).

1,4-beta-D-glucan synthase activity, 1,4-beta-glucan synthase activity, GS-I, UDP-glucose-1,4-beta-glucan glucosyltransferase activity, UDP-glucose-beta-D-glucan glucosyltransferase activity, UDP-glucose-cellulose glucosyltransferase activity, UDP-glucose:1,4-beta-D-glucan 4-beta-D-glucosyltransferase activity, UDPglucose-beta-glucan glucosyltransferase activity, UDPglucose-cellulose glucosyltransferase activity, UDPglucose:1,4-beta-D-glucan 4-beta-D-glucosyltransferase activity, beta-1,4-glucan synthase activity, beta-1,4-glucan synthetase activity, beta-1,4-glucosyltransferase activity, beta-glucan synthase activity, cellulose synthase (UDP-forming) activity, glucan synthase activity, uridine diphosphoglucose-1,4-beta-glucan glucosyltransferase activity, uridine diphosphoglucose-cellulose glucosyltransferase activity