3,4-Dihydroxy-2-butanone-4-phosphate synthase catalyses conversion of ribulose 5-phosphate to L-3,4-dihydroxy-2-butanone-4-phosphate and formate in a commitment step of riboflavin biosynthesis. This enzyme has a requirement for divalent metal cations.
Defined by 8 residues: GLU:A-37ASP:A-41CYS:A-66TYR:A-94ASP:A_2-99HIS:A_2-136HIS:A-153GLU:A-174