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Tang LWT, Verma RK, Yong RP, Li X, Wang L, Lin Q, Fan H, Chan ECY. Differential Reversible and Irreversible Interactions between Benzbromarone and Human Cytochrome P450s 3A4 and 3A5. Mol Pharmacol 2021; 100:224-236. [PMID: 34210765 DOI: 10.1124/molpharm.121.000256] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2021] [Accepted: 06/21/2021] [Indexed: 11/22/2022] Open
Abstract
Mounting evidence has revealed that despite the high degree of sequence homology between cytochrome P450 3A isoforms (i.e., CYP3A4 and CYP3A5), they have the propensities to exhibit vastly different irreversible and reversible interactions with a single substrate. We have previously established that benzbromarone (BBR), a potent uricosuric agent used in the management of gout, irreversibly inhibits CYP3A4 via mechanism-based inactivation (MBI). However, it remains unelucidated if CYP3A5-its highly homologous counterpart-is susceptible to inactivation by BBR. Using three structurally distinct probe substrates, we consistently demonstrated that MBI was not elicited in CYP3A5 by BBR. Our in silico covalent docking models and molecular dynamics simulations suggested that disparities in the susceptibilities toward MBI could be attributed to the specific effects of BBR covalent adducts on the F-F' loop. Serendipitously, we also discovered that BBR reversibly activated CYP3A5-mediated rivaroxaban hydroxylation wherein apparent V max increased and K m decreased with increasing BBR concentration. Fitting data to the two-site model yielded interaction factors α and β of 0.44 and 5.88, respectively, thereby confirming heterotropic activation of CYP3A5 by BBR. Furthermore, heteroactivation was suppressed by the CYP3A inhibitor ketoconazole in a concentration-dependent manner and decreased with increasing preincubation time, implying that activation was incited via binding of parent BBR molecule within the enzymatic active site. Finally, noncovalent docking revealed that CYP3A5 can more favorably accommodate both BBR and rivaroxaban in concert as compared with CYP3A4, which further substantiated our experimental observations. SIGNIFICANCE STATEMENT: Although it has been previously demonstrated that benzbromarone (BBR) inactivates CYP3A4, it remains uninterrogated whether it also elicits mechanism-based inactivation in CYP3A5, which shares ∼85% sequence similarity with CYP3A4. This study reported that BBR exhibited differential irreversible and reversible interactions with both CYP3A isoforms and further unraveled the molecular determinants underpinning their diverging interactions. These data offer important insight into differential kinetic behavior of CYP3A4 and CYP3A5, which potentially contributes to interindividual variabilities in drug disposition.
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Affiliation(s)
- Lloyd Wei Tat Tang
- Department of Pharmacy, Faculty of Science (L.W.T.T., R.P.Y., E.C.Y.C.), and Protein and Proteomics Centre (PPC), SingMass (X.L., L.W., Q.L.), National University of Singapore, Singapore; and Bioinformatics Institute (BII), Agency for Science, Technology and Research (A*STAR), Singapore (R.K.V., H.F.)
| | - Ravi Kumar Verma
- Department of Pharmacy, Faculty of Science (L.W.T.T., R.P.Y., E.C.Y.C.), and Protein and Proteomics Centre (PPC), SingMass (X.L., L.W., Q.L.), National University of Singapore, Singapore; and Bioinformatics Institute (BII), Agency for Science, Technology and Research (A*STAR), Singapore (R.K.V., H.F.)
| | - Ren Ping Yong
- Department of Pharmacy, Faculty of Science (L.W.T.T., R.P.Y., E.C.Y.C.), and Protein and Proteomics Centre (PPC), SingMass (X.L., L.W., Q.L.), National University of Singapore, Singapore; and Bioinformatics Institute (BII), Agency for Science, Technology and Research (A*STAR), Singapore (R.K.V., H.F.)
| | - Xin Li
- Department of Pharmacy, Faculty of Science (L.W.T.T., R.P.Y., E.C.Y.C.), and Protein and Proteomics Centre (PPC), SingMass (X.L., L.W., Q.L.), National University of Singapore, Singapore; and Bioinformatics Institute (BII), Agency for Science, Technology and Research (A*STAR), Singapore (R.K.V., H.F.)
| | - Lili Wang
- Department of Pharmacy, Faculty of Science (L.W.T.T., R.P.Y., E.C.Y.C.), and Protein and Proteomics Centre (PPC), SingMass (X.L., L.W., Q.L.), National University of Singapore, Singapore; and Bioinformatics Institute (BII), Agency for Science, Technology and Research (A*STAR), Singapore (R.K.V., H.F.)
| | - Qingsong Lin
- Department of Pharmacy, Faculty of Science (L.W.T.T., R.P.Y., E.C.Y.C.), and Protein and Proteomics Centre (PPC), SingMass (X.L., L.W., Q.L.), National University of Singapore, Singapore; and Bioinformatics Institute (BII), Agency for Science, Technology and Research (A*STAR), Singapore (R.K.V., H.F.)
| | - Hao Fan
- Department of Pharmacy, Faculty of Science (L.W.T.T., R.P.Y., E.C.Y.C.), and Protein and Proteomics Centre (PPC), SingMass (X.L., L.W., Q.L.), National University of Singapore, Singapore; and Bioinformatics Institute (BII), Agency for Science, Technology and Research (A*STAR), Singapore (R.K.V., H.F.)
| | - Eric Chun Yong Chan
- Department of Pharmacy, Faculty of Science (L.W.T.T., R.P.Y., E.C.Y.C.), and Protein and Proteomics Centre (PPC), SingMass (X.L., L.W., Q.L.), National University of Singapore, Singapore; and Bioinformatics Institute (BII), Agency for Science, Technology and Research (A*STAR), Singapore (R.K.V., H.F.)
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