TABLE 5.

Predicted properties of the subunits of H-I and H-II of P. furiosus

Subunit	H-II (kDa)	H-I (kDa)	Sequence similarity (%)	Cys residues (II/I)	Proposed cofactors
α	46.2	48.7	55	4/4	Ni-Fe site
δ	26.2	29.6	63	12/13	3× [4Fe-4S]
β	39.2	41.8	58	17/18	2× [4Fe-4S]
γ	32.9	33.2	55	10/7	1× [2Fe-2S] FAD
αβγδ	144.5	153.3		43/42