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  • Title: Surface potential changes of mitoplasts in the presence of pyridoxal phosphate modified cytochromes c.
    Author: Dancheva KI, Mitovska MI, Ianakiova ZK, Panacenko OM, Azizova OA.
    Journal: Int J Biochem; 1992 Dec; 24(12):1991-6. PubMed ID: 1335425.
    Abstract:
    1. The addition of native cytochrome c to mitoplasts leads to a decrease of surface potential of the mitoplast membrane. However the surface potential is slightly decreased (approximately 3 mV) when PLP(Lys 86)-cytochrome c and PLP(Lys 79)-cytochrome c were added. 2. The native and PLP-modified cytochromes c do not influence the order parameters S and isotropic constant a when both spin probe I and probe II were used. It is shown that cytochrome c binding to the membrane does not affect the hydrophobic intermembrane area as well as the lipid arrangements of the mitoplast membrane. 3. At low ionic strength there was observed a significant difference in the membrane potential when PLP-cytochromes c were added to the mitoplasts. 4. At high ionic strength the addition of native or PLP-modified cytochromes c does not change the membrane potential.
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