Quantitative Structure Activity Relationships for the Glucuronidation of Simple Phenols by Expressed Human UGT1A6 and UGT1A9
UGT1A6 and UGT1A9 have both been demonstrated to rapidly glucuronidate simple phenolic compounds. A series of simple phenols were selected and screened with both isoforms and then used as model substrates for the generation of V max and K m values. UGT1A6 showed a more restricted acceptance of pheno...
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Published in | Drug metabolism and disposition Vol. 30; no. 6; pp. 734 - 738 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
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American Society for Pharmacology and Experimental Therapeutics
01.06.2002
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Abstract | UGT1A6 and UGT1A9 have both been demonstrated to rapidly glucuronidate simple phenolic compounds. A series of simple phenols
were selected and screened with both isoforms and then used as model substrates for the generation of V max and K m values. UGT1A6 showed a more restricted acceptance of phenolic substrates compared with UGT1A9. However, the affinity of
UGT1A6 for these compounds exhibited higher K m values than UGT1A9, although rates of turnover were similar. Molecular surface-weighted holistic invariant molecular descriptors
were generated for each substrate and used to produce the first quantitative structure activity relationship models generated
for expressed human UGTs. Models relating log of the K m value to the generated descriptors correlated well with the experimental data r 2 value of 0.996 for UGT1A6 and r 2 value of 0.83 for UGT1A9. Cross validation by a leave-one-out method also showed good predictive capability within the subset
with a q 2 value of 0.98 for UGT1A6 and q 2 value of 0.73 for UGT1A9. Empirically, UGT1A6 V max decreased as the 4-substituent increased in size, and a trend was observed when UGT1A6 V max was plotted against molecular volume. The larger UGT1A6 substrates were typified by low activity and lower K m values than their smaller counterparts. Extrapolating from this, it was demonstrated that phenols with large 4-substituents,
which were not UGT1A6 substrates, could inhibit 4-ethylphenol glucuronidation. The K m values for UGT1A9 showed a similar relationship to UGT1A6 but with much lower K m values and greater variability in range of this value. |
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AbstractList | UGT1A6 and UGT1A9 have both been demonstrated to rapidly glucuronidate simple phenolic compounds. A series of simple phenols
were selected and screened with both isoforms and then used as model substrates for the generation of V max and K m values. UGT1A6 showed a more restricted acceptance of phenolic substrates compared with UGT1A9. However, the affinity of
UGT1A6 for these compounds exhibited higher K m values than UGT1A9, although rates of turnover were similar. Molecular surface-weighted holistic invariant molecular descriptors
were generated for each substrate and used to produce the first quantitative structure activity relationship models generated
for expressed human UGTs. Models relating log of the K m value to the generated descriptors correlated well with the experimental data r 2 value of 0.996 for UGT1A6 and r 2 value of 0.83 for UGT1A9. Cross validation by a leave-one-out method also showed good predictive capability within the subset
with a q 2 value of 0.98 for UGT1A6 and q 2 value of 0.73 for UGT1A9. Empirically, UGT1A6 V max decreased as the 4-substituent increased in size, and a trend was observed when UGT1A6 V max was plotted against molecular volume. The larger UGT1A6 substrates were typified by low activity and lower K m values than their smaller counterparts. Extrapolating from this, it was demonstrated that phenols with large 4-substituents,
which were not UGT1A6 substrates, could inhibit 4-ethylphenol glucuronidation. The K m values for UGT1A9 showed a similar relationship to UGT1A6 but with much lower K m values and greater variability in range of this value. UGT1A6 and UGT1A9 have both been demonstrated to rapidly glucuronidate simple phenolic compounds. A series of simple phenols were selected and screened with both isoforms and then used as model substrates for the generation of V(max) and K(m) values. UGT1A6 showed a more restricted acceptance of phenolic substrates compared with UGT1A9. However, the affinity of UGT1A6 for these compounds exhibited higher K(m) values than UGT1A9, although rates of turnover were similar. Molecular surface-weighted holistic invariant molecular descriptors were generated for each substrate and used to produce the first quantitative structure activity relationship models generated for expressed human UGTs. Models relating log of the K(m) value to the generated descriptors correlated well with the experimental data r(2) value of 0.996 for UGT1A6 and r(2) value of 0.83 for UGT1A9. Cross validation by a leave-one-out method also showed good predictive capability within the subset with a q(2) value of 0.98 for UGT1A6 and q(2) value of 0.73 for UGT1A9. Empirically, UGT1A6 V(max) decreased as the 4-substituent increased in size, and a trend was observed when UGT1A6 V(max) was plotted against molecular volume. The larger UGT1A6 substrates were typified by low activity and lower K(m) values than their smaller counterparts. Extrapolating from this, it was demonstrated that phenols with large 4-substituents, which were not UGT1A6 substrates, could inhibit 4-ethylphenol glucuronidation. The K(m) values for UGT1A9 showed a similar relationship to UGT1A6 but with much lower K(m) values and greater variability in range of this value. |
Author | Brian T. Ethell Brian Burchell Jibo Wang Sean Ekins |
Author_xml | – sequence: 1 givenname: Brian T surname: ETHELL fullname: ETHELL, Brian T organization: Department of Molecular and Cellular Pathology, Ninewells Hospital and Medical School, Dundee, United Kingdom – sequence: 2 givenname: Sean surname: EKINS fullname: EKINS, Sean organization: Lilly Research Laboratories, Eli Lilly and Company, Lilly Corporate Center, Indianapolis, indiana, United States – sequence: 3 surname: JIBO WANG fullname: JIBO WANG organization: Lilly Research Laboratories, Eli Lilly and Company, Lilly Corporate Center, Indianapolis, indiana, United States – sequence: 4 givenname: Brian surname: BURCHELL fullname: BURCHELL, Brian organization: Department of Molecular and Cellular Pathology, Ninewells Hospital and Medical School, Dundee, United Kingdom |
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Cites_doi | 10.2165/00003088-199732030-00004 10.1002/qsar.19970160203 10.1042/bj1510131 10.1016/0009-2797(94)90110-4 10.1073/pnas.85.22.8381 10.1002/cem.1180080405 10.1002/prot.340180111 10.1042/bj3030233 10.1002/(SICI)1521-3838(200002)19:1<29::AID-QSAR29>3.0.CO;2-P 10.1006/abio.1997.2443 10.1002/jps.2600801013 10.1016/0003-9861(68)90038-6 10.1016/S0021-9258(19)52451-6 10.1016/0005-2744(76)90324-7 10.1016/0898-5529(90)90156-3 10.1042/bj2780465 10.1006/abbi.1994.1157 10.1042/bj0520416 10.3109/00498259109039459 10.1097/00008571-199708000-00001 |
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Keywords | Human Substrate Structure activity relation UDP-glucuronosyltransferase Enzyme Isozyme Transferases Glycosyltransferases Phenols Glucuronic acid conjugation Hexosyltransferases Quantitative analysis |
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Snippet | UGT1A6 and UGT1A9 have both been demonstrated to rapidly glucuronidate simple phenolic compounds. A series of simple phenols
were selected and screened with... UGT1A6 and UGT1A9 have both been demonstrated to rapidly glucuronidate simple phenolic compounds. A series of simple phenols were selected and screened with... |
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SubjectTerms | Biological and medical sciences Cell Line General pharmacology Glucuronides - metabolism Glucuronosyltransferase - metabolism Humans Isoenzymes - metabolism Kinetics Medical sciences Molecular Structure Pharmacology. Drug treatments Phenols - chemistry Phenols - metabolism Phenols - pharmacokinetics Physicochemical properties. Structure-activity relationships Quantitative Structure-Activity Relationship |
Title | Quantitative Structure Activity Relationships for the Glucuronidation of Simple Phenols by Expressed Human UGT1A6 and UGT1A9 |
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