ID 2.4.1.183 DE alpha-1,3-glucan synthase. CA [(1->3)-alpha-D-glucosyl](n) + UDP-alpha-D-glucose = [(1->3)-alpha-D- CA glucosyl](n+1) + H(+) + UDP. CC -!- A glucan primer is needed to begin the reaction, which brings about CC elongation of the glucan chains. DR Q9USK8, AGS1_SCHPO ; Q09854, MOK11_SCHPO; Q9UUL4, MOK12_SCHPO; DR Q9Y719, MOK13_SCHPO; Q9Y704, MOK14_SCHPO; //