Single Heteroatom Substitutions in the Efavirenz Oxazinone Ring Impact Metabolism by CYP2B6.
Single Heteroatom Substitutions in the Efavirenz Oxazinone Ring Impact Metabolism by CYP2B6.
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efavirenz恶酮环中的单个杂原子取代影响CYP2B6的代谢。
DOI:
10.1002/cmdc.201600519
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发表时间:
2016-12-06
期刊:
影响因子:
3.4
通讯作者:
Bumpus, Namandj N.
中科院分区:
文献类型:
--
作者:
Cox, Philip M.;Bumpus, Namandj N.
Previously, we observed that the oxazinone ring is important for CYP2B6 activity toward efavirenz ((4S)-6-Chloro-4-(2-cyclopropylethynyl)-1,4-dihydro-4-(trifluoromethyl)-2H-3,1-benzoxazin-2-one), a CYP2B6 substrate used to treat HIV. Here, to further understand the structural characteristics of efavirenz that render it a CYP2B6 substrate, we test the importance of each heteroatom of the oxazinone ring. We assembled a panel of five analogues: 6-Chloro-4-(2-cyclopropylethynyl)-1,4-dihydro-2-methyl-4-(trifluoromethyl)-2H-3,1-benzoxazine (1), (4S)-6-Chloro-4-[(1E)-2-cyclopropylethenyl]-3,4-dihydro-4-(trifluoromethyl)-,2(1H)-quinazolinone (2), (4S)-6-Chloro-4-(2-cyclopropylethynyl)-3,4-dihydro-4-(trifluoromethyl)-2(1H)-quinazolinone (3), 6-Chloro-4-(cyclopropylethynyl)-3,4-dihydro-4-(trifluoromethyl)-2(1H)-quinolinone (4), and 6-Chloro-4-(cyclopropylethynyl)-4-(trifluoromethyl)-4H-benzo[d][1,3]dioxin-2-one (5). Metabolism of 1–5 was investigated using human liver microsomes, individual P450s, and mass spectrometry or UV absorbance detection. Steady-state analysis of CYP2B6 metabolism of 1–5 showed KM values ranging from 0.3 to 3.9 fold different than observed for efavirenz (KM of 3.6 ± 1.7 μM). The lowest KM values approximating 1 μM, were observed for metabolism of 1, while the largest KM, 14 ± 6.4 μM, was found for 4. Our work reveals that analogues with heteroatom changes in the oxazinone ring are still CYP2B6 substrates, though the changes KM suggest altered substrate binding. A panel of efavirenz analogues with single heteroatom changes in the oxazinone ring were assessed for their ability to be metabolized by human cytochrome P450 2B6 (CYP2B6). Though each analogue was still found to be a substrate for CYP2B6, KM values associated with product formation by CYP2B6 were determined to be quite different from efavirenz.
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影响因子:
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作者:
Kharasch ED;Regina KJ;Blood J;Friedel C
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DOI:
10.1124/jpet.111.183111
发表时间:
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