hydrogenase ( hydrogen : ferricytochrome c3 oxidoreductase , ec 1.12.2.1 ) catalyzes three types of reactions , i.e. , ( 1 ) conversion between hydrogen modifications , para-h2 and ortho-h2 , ( 2 ) exchange reaction between hydrogen isotopes , and ( 3 ) reversible oxidoreduction of an electron carrier with h2 and protons .
C0020284
hydrogenase
C0030016
oxidoreductase