ID 2.4.1.33 DE mannuronan synthase. AN alginate synthase. AN mannuronosyl transferase. CA [(1->4)-beta-D-mannuronosyl](n) + GDP-alpha-D-mannuronate = [(1->4)-beta- CA D-mannuronosyl](n+1) + GDP + H(+). CC -!- The enzyme catalyzes the polymerization of beta-D-mannuronate CC residues into a mannuronan polymer, an intermediate in the CC biosynthesis of alginate. CC -!- It is found in brown algae and in alginate-producing bacterial CC species from the Pseudomonas and Azotobacter genera. DR Q9HY69, ALG44_PSEAE; Q52463, ALG8_PSEAE ; //