I-Dehydrogenases zididi lwee-enzymes ezidlala indima ebalulekileyo kwiimpendulo zebhayoloji ngokuququzelela ukususwa kwehydrogen kwi-sub. iimpahla. Ezi enzymes zidityaniswa kwiindlela ezahlukeneyo ze-metabolic, kubandakanya ukuphefumla kweseli kunye ne-biosynthesis yee-biomolecules ezibalulekileyo. I-Dehydrogenases ibandakanyeka ikakhulu kwiimpendulo zokunciphisa i-oxidation, apho zikhuthaza khona ukuhanjiswa kwee-elektrons