Enzyme–Substrate Reporters for Evaluation of Substrate Specificity of HIF Prolyl Hydroxylase Isoforms

Osipyants, A.I.; Smirnova, N.A.; Khristichenko, A.Y.; Hushpulian, D.M.; Nikulin, S.V.; Chubar, T.A.; Zakhariants, A.A.; Tishkov, V.I.; Gazaryan, I.G.; Poloznikov, A.A.

Авторы: Osipyants A.I., Smirnova N.A., Khristichenko A.Yu, Hushpulian D.M., Nikulin S.V., Chubar T.A., Zakhariants A.A., Tishkov V.I., Gazaryan I.G., Poloznikov A.A.
Журнал: Biochemistry (Moscow)
Том: 82
Номер: 10
Год издания: 2017
Издательство: Pleiades Publishing, Ltd
Местоположение издательства: Road Town, United Kingdom
Первая страница: 1207
Последняя страница: 1214
DOI: 10.1134/S0006297917100145
Аннотация: An organism naturally responds to hypoxia via stabilization of hypoxia inducible factor (HIF). There are three isoforms of HIF subunits whose stability is regulated by three isozymes of HIF prolyl hydroxylase (PHD1-3). Despite intense studies on recombinant enzyme isoforms using homogeneous activity assay, there is no consensus on the PHD isoform preference for the HIF isoform as a substrate. This work provides a new approach to the problem of substrate specificity using cell based reporters expressing the enzyme and luciferase labeled substrate pair encoded in the same expression vector. The cell is used as a microbioreactor for running the reaction between the overexpressed enzyme and substrate. Using this novel approach, no PHD3 activity toward HIF3 was demonstrated, indirectly pointing to the hydroxylation of the second proline in 564PYIP567 (HIF1) catalyzed by this isozyme. The use of “paired” enzyme–substrate reporters to evaluate the potency of “branched tail” oxyquinoline inhibitors of HIF PHD allows higher precision in revealing the optimal structural motif for each enzyme isoform
Добавил в систему: Тишков Владимир Иванович

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Enzyme–Substrate Reporters for Evaluation of Substrate Specificity of HIF Prolyl Hydroxylase Isoformsстатья

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