The effect of isatin on protein-protein interactions between cytochrome b5 and cytochromes P450

Ershov P.V.1 , Yablokov E.O.1, Mezentsev Yu.V.1, Kalushskiy L.A.1, Florinskaya A.V.1, Veselovsky A.V.1, Gnedenko O.V.1, Gilep A.A.2, Usanov S.A.2, Medvedev A.E.1, Ivanov A.S.1

1. Institute of Biomedical Chemistry, Moscow, Russia
2. Institute of Bioorganic Chemistry, National Academy of Sciences of Belarus, Minsk, Belarus
Section: Short Communication
DOI: 10.18097/PBMC20176302170      PubMed Id: 28414290
Year: 2017  Volume: 63  Issue: 2  Pages: 170-175
Cytochromes P450 (CYP) are involved in numerous biochemical processes including metabolism of xenobiotics, biosynthesis of cholesterol, steroid hormones etc. Since some CYP catalyze indol oxidation to isatin, we have hypothesized that isatin can regulate protein-protein interactions (PPI) between components of the CYP system thus representing a (negative?) feedback mechanism. The aim of this study was to investigate a possible effect of isatin on interaction of human CYP with cytochrome b5 (CYB5A). Using the optical biosensor test system employing surface plasmon resonance (SPR) we have investigated interaction of immobilized CYB5A with various CYP in the absence and in the presence of isatin. The SPR-based experiments have shown that a high concentration of isatin (270 mM) increases Kd values for complexes CYB5A/CYP3А5 and CYB5A/CYP3A4 (twofold and threefold, respectively), but has no influence on complex formation between CYB5A and other CYP (including indol-metabolizing CYP2C19 and CYP2E1). Isatin injection to the optical biosensor chip with the preformed molecular complex CYB5A/CYP3A4 caused a 30%-increase in its dissociation rate. Molecular docking manipulations have shown that isatin can influence interaction of CYP3А5 or CYP3A4 with CYB5A acting at the contact region of CYB5A/CYP.
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Keywords: cytochromes P450, cytochrome b5, protein-protein interaction, isatin, inhibitor, surface plasmon resonance, interactomics

Ershov, P. V., Yablokov, E. O., Mezentsev, Yu. V., Kalushskiy, L. A., Florinskaya, A. V., Veselovsky, A. V., Gnedenko, O. V., Gilep, A. A., Usanov, S. A., Medvedev, A. E., Ivanov, A. S. (2017). The effect of isatin on protein-protein interactions between cytochrome b5 and cytochromes P450. Biomeditsinskaya Khimiya, 63(2), 170-175.
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