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  • Title: Effect of papain digestion on redox-linked proton translocation in b-c1 complex from beef heart reconstituted into liposomes.
    Author: Lorusso M, Gatti D, Marzo M, Papa S.
    Journal: FEBS Lett; 1985 Mar 25; 182(2):370-4. PubMed ID: 2579851.
    Abstract:
    Papain treatment of the cytochrome b-c1 complex from beef heart results in partial proteolysis of core protein II, the iron-sulphur protein and the 15-kDa subunit. Under these conditions a significant inhibition of electron flow and complete suppression of proton translocation in the complex reconstituted into liposomes are observed. Kinetic experiments indicate a correlation between the digestion of core protein II and 15-kDa subunit and the suppression of proton translocation. The results suggest an active involvement of polypeptides of the complex in stabilizing the semiquinone species and/or providing pathways to exchange protons between bound quinone systems and aqueous phases.
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