ID 1.3.7.6 DE phycoerythrobilin synthase. CA (3Z)-phycoerythrobilin + 2 oxidized 2[4Fe-4S]-[ferredoxin] = biliverdin CA IXalpha + 4 H(+) + 2 reduced 2[4Fe-4S]-[ferredoxin]. CC -!- This enzyme, from a cyanophage infecting oceanic cyanobacteria of the CC Prochlorococcus genus, uses a four-electron reduction to carry out CC the reactions catalyzed by EC 1.3.7.2 and EC 1.3.7.3. CC -!- 15,16-Dihydrobiliverdin is formed as a bound intermediate. CC -!- Free 15,16-dihydrobiliverdin can also act as a substrate to form CC phycoerythrobilin. DR Q58MU6, PEBS_BPPRM ; //