GO:0000248

C-5 sterol desaturase activity

Details: 
Catalysis of the reaction: 5,7,24(28)-ergostatrienol + O2 + NADPH = 5,7,22,24(28)-ergostatetraenol + 2 H2O + NADP+. [MetaCyc:RXN3O-227]
Evidence Code: 
IEA