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The role of cytochrome b 5 structural domains in interaction with cytochromes P450

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Abstract

To understand the role of the structural elements of cytochrome b 5 in its interaction with cytochrome P450 and the catalysis performed by this heme protein, we carried out comparative structural and functional analysis of the two major mammalian forms of membrane-bound cytochrome b 5 — microsomal and mitochondrial, designed chimeric forms of the heme proteins in which the hydrophilic domain of one heme protein is replaced by the hydrophilic domain of another one, and investigated the effect of the highly purified native and chimeric heme proteins on the enzymatic activity of recombinant cytochromes P4503A4 and P45017A1 (CYP3A4 and CYP17A1). We show that the presence of a hydrophobic domain in the structure of cytochrome b 5 is necessary for its effective interaction with its redox partners, while the nature of the hydrophobic domain has no significant effect on the ability of cytochrome b 5 to stimulate the activity of cytochrome P450-catalyzed reactions. Thus, the functional properties of cytochrome b 5 are mainly determined by the structure of the hemebinding domain.

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Authors and Affiliations

  1. Institute of Bioorganic Chemistry, Academy of Sciences of Belarus, ul. Akademika Kuprevicha 5/2, 220141, Minsk, Belarus

    G. V. Sergeev, A. A. Gilep & S. A. Usanov

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  1. G. V. Sergeev
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  2. A. A. Gilep
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  3. S. A. Usanov
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Correspondence to G. V. Sergeev.

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Published in Russian in Biokhimiya, 2014, Vol. 79, No. 5, pp. 520–531.

Originally published in Biochemistry (Moscow) On-Line Papers in Press, as Manuscript BM13-318, March 30, 2014.

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Sergeev, G.V., Gilep, A.A. & Usanov, S.A. The role of cytochrome b 5 structural domains in interaction with cytochromes P450. Biochemistry Moscow 79, 406–416 (2014). https://doi.org/10.1134/S0006297914050046

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  • DOI: https://doi.org/10.1134/S0006297914050046

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