“…A significant effort has been put on the study and characterisation of the nature and properties of several electron transfer complexes: cytochrome c and cytochrome bS [Salemme et al, 1976;Stonehuemer et al, 1979;Mauk et al, 1982;Eley and Moore, 1983;Wendoloski et al, 1987;Burch et al, 1990;Whitford et al, 1990;Eltis et al, 1991;Willie et al, 1992], cytochrome c with cytochrome c peroxidase [Poulos and Kraut, 1980;Pelletier and Kraut, 1992], cytochrome c with flavodoxin [Simondsen et al, 1982;Simondsen and Tollin, 1983;Tollin et al, 1984;Weber and Tollin, 1985;Dickerson et al, 1985;Hazzard et al, 1986;Tollin et al, 1987], cytochrome c with plastocyanin [Zhou and Kostic, 1992], hydrogenase with cytochrome C3, rubredoxin, ferredoxin and flavodoxin [Bell et al, 1978], cytochrome C3 with ferredoxin [Moura, J.J.G. et al, 1977;Xavier and Moura, 1978;Xavier et al, 1979;Guerlesquin et al, 1984Guerlesquin et al, , 1985Guerlesquin et al, and 1987Capeill~re-Blandin et al, 1986;Cambillau et al, 1988, Park et al, 1991, cytochrome C3 with rubredoxin [Moura, I. et al, 1980a;Stewart et al, 1989], cytochrome C3 with flavodoxin [Moura, I. et al, 1980a;Stewart et al, 1988] and a macro inorganic anion [Mus-Veteau et al, 1992].…”