17-SUBSTITUTED STEROIDAL TETRAZOLES – NOVEL LIGANDS FOR HUMAN STEROID-CONVERTING CYP ENZYMES

S. Jovanović-Šanta, Aleksandar M. Oklješa, A. B. Sachanka, Yaraslau U Dzichenka, S. Usanov
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Abstract

In animal and human organisms, there are many enzymes, members of the family of heme- containing proteins, cytochromes P450 (CYPs), included in the biosynthesis and metabolism of many biomolecules, as cholesterol, bile acids, sex, and corticosteroid hormones, as well as in metabolism of drugs and xenobiotics. It is also well-known that different imidazole and triazole derivatives are efficient inhibitors of CYPs activity. In this study, we present in vitro screening of binding of novel androstane derivatives with tetrazole- containing substituents in position 17 to human recombinant steroid-converting CYP enzymes: CYP7A1, CYP7B1, CYP17A1, CYP19, and CYP21. Initial screening was performed using a high throughput screening approach, while the affinity of the ligands was analyzed using spectrophotometric titration. For some among tested compounds type I spectral response (substrate-like binding) for CYP7A1 selectively, while for one compound type II spectral response (inhibitor-like binding) for CYP21 were detected, with micromolar values of Kds. Interestingly, one compound with mixed spectral response was found to bind for CYP7B1, which means that there are two optimal positions of the ligand inside the protein active site. Such results could be useful in CYP-inhibiting drug development, during a fast, high-throughput screening of pharmacological potential of novel compounds, as well as in side- effects recognizing.
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17-取代甾体四唑-人类类固醇转化cyp酶的新型配体
在动物和人类有机体中,有许多酶,含血红素蛋白家族的成员,细胞色素P450 (CYPs),包括许多生物分子的生物合成和代谢,如胆固醇,胆汁酸,性和皮质类固醇激素,以及药物和异种生物的代谢。众所周知,不同的咪唑和三唑衍生物是CYPs活性的有效抑制剂。在这项研究中,我们在体外筛选了17位含四氮唑取代基的新型雄甾烷衍生物与人重组类固醇转化CYP酶的结合:CYP7A1, CYP7B1, CYP17A1, CYP19和CYP21。采用高通量筛选方法进行初步筛选,同时采用分光光度滴定法分析配体的亲和力。部分化合物对CYP7A1有选择性的I型光谱响应(底物样结合),而对CYP21有选择性的II型光谱响应(抑制剂样结合),Kds为微摩尔值。有趣的是,一种混合光谱反应的化合物被发现与CYP7B1结合,这意味着配体在蛋白质活性位点内有两个最佳位置。这些结果可能有助于cypp抑制药物的开发,在新化合物的药理潜力的快速,高通量筛选,以及在副作用识别。
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