▁de h ydro gen ase ▁() ▁is ▁an ▁en zym e ▁that ▁catal y zes ▁the ▁chemical ▁reaction ▁▁ 3 β - h ydro xy - 5 α - pre gn ane - 2 0 - one ▁+ ▁N AD P + ▁▁ 5 α - pre gn an - 3 , 2 0 - d ione ▁+ ▁N AD PH ▁+ ▁H + ▁ ▁Thus , ▁the ▁two ▁substr ates ▁of ▁this ▁en zym e ▁are ▁ 3 β - h ydro xy - 5 α - pre gn ane - 2 0 - one ▁( allo pre gn an ol one ) ▁and ▁N AD P + , ▁whereas ▁its ▁ 3 ▁products ▁are ▁ 5 α - pre gn an - 3 , 2 0 - d ione , ▁N AD PH , ▁and ▁H + . ▁ ▁This ▁en zym e ▁belongs ▁to ▁the ▁family ▁of ▁ox id ored uct ases , ▁specifically ▁those ▁acting ▁on ▁the ▁CH - OH ▁group ▁of ▁don or ▁with ▁N AD + ▁or ▁N AD P + ▁as ▁accept or . ▁The ▁system atic ▁name ▁of ▁this ▁en zym e ▁class ▁is ▁ 3 β - h ydro xy - 5 α - st ero id : N AD P + ▁ 3 - ox id ored uct ase . ▁ ▁References ▁▁▁▁▁▁ ▁Category : EC ▁ 1 . 1 . 1 ▁Category : N AD PH - dependent ▁en zym es ▁Category : En zym es ▁of ▁unknown ▁structure <0x0A> </s> ▁The