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Raju DR, Kumar A, BK N, Shetty A, PS A, Kumar RP, Lalitha R, Sigamani G. Extensive modelling and quantum chemical study of sterol C-22 desaturase mechanism: A commercially important cytochrome P450 family. Catal Today 2021. [DOI: 10.1016/j.cattod.2021.12.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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Jang HH, Shin SM, Ma SH, Lee GY, Joung YH, Yun CH. Role of Leu188 in the Fatty Acid Hydroxylase Activity of CYP102A1 from Bacillus megaterium. ACTA ACUST UNITED AC 2016. [DOI: 10.1016/j.molcatb.2016.07.010] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Quehl P, Hollender J, Schüürmann J, Brossette T, Maas R, Jose J. Co-expression of active human cytochrome P450 1A2 and cytochrome P450 reductase on the cell surface of Escherichia coli. Microb Cell Fact 2016; 15:26. [PMID: 26838175 PMCID: PMC4736170 DOI: 10.1186/s12934-016-0427-5] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2015] [Accepted: 01/19/2016] [Indexed: 11/23/2022] Open
Abstract
Background Human cytochrome P450 (CYP) enzymes mediate the first step in the breakdown of most drugs and are strongly involved in drug–drug interactions, drug clearance and activation of prodrugs. Their biocatalytic behavior is a key parameter during drug development which requires preparative synthesis of CYP related drug metabolites. However, recombinant expression of CYP enzymes is a challenging bottleneck for drug metabolite biosynthesis. Therefore, we developed a novel approach by displaying human cytochrome P450 1A2 (CYP1A2) and cytochrome P450 reductase (CPR) on the surface of Escherichia coli. Results To present human CYP1A2 and CPR on the surface, we employed autodisplay. Both enzymes were displayed on the surface which was demonstrated by protease and antibody accessibility tests. CPR activity was first confirmed with the protein substrate cytochrome c. Cells co-expressing CYP1A2 and CPR were capable of catalyzing the conversion of the known CYP1A2 substrates 7-ethoxyresorufin, phenacetin and the artificial substrate luciferin-MultiCYP, which would not have been possible without interaction of both enzymes. Biocatalytic activity was strongly influenced by the composition of the growth medium. Addition of 5-aminolevulinic acid was necessary to obtain a fully active whole cell biocatalyst and was superior to the addition of heme. Conclusion We demonstrated that CYP1A2 and CPR can be co-expressed catalytically active on the cell surface of E. coli. It is a promising step towards pharmaceutical applications such as the synthesis of drug metabolites. Electronic supplementary material The online version of this article (doi:10.1186/s12934-016-0427-5) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Paul Quehl
- Institut für Pharmazeutische und Medizinische Chemie, PharmaCampus, Westfälische Wilhelms-Universität Münster, Corrensstraße 48, 48149, Münster, Germany.
| | - Joel Hollender
- Institut für Pharmazeutische und Medizinische Chemie, PharmaCampus, Westfälische Wilhelms-Universität Münster, Corrensstraße 48, 48149, Münster, Germany. .,Autodisplay Biotech GmbH, Merowingerplatz 1a, 40225, Düsseldorf, Germany.
| | - Jan Schüürmann
- Institut für Pharmazeutische und Medizinische Chemie, PharmaCampus, Westfälische Wilhelms-Universität Münster, Corrensstraße 48, 48149, Münster, Germany.
| | - Tatjana Brossette
- Autodisplay Biotech GmbH, Merowingerplatz 1a, 40225, Düsseldorf, Germany.
| | - Ruth Maas
- Autodisplay Biotech GmbH, Merowingerplatz 1a, 40225, Düsseldorf, Germany.
| | - Joachim Jose
- Institut für Pharmazeutische und Medizinische Chemie, PharmaCampus, Westfälische Wilhelms-Universität Münster, Corrensstraße 48, 48149, Münster, Germany.
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Lee GY, Kim HM, Ma SH, Park SH, Joung YH, Yun CH. Heterologous expression and functional characterization of the NADPH-cytochrome P450 reductase from Capsicum annuum. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2014; 82:116-22. [PMID: 24935229 DOI: 10.1016/j.plaphy.2014.05.010] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2014] [Accepted: 05/20/2014] [Indexed: 05/27/2023]
Abstract
Two NADPH-cytochrome P450 reductase (CPR) genes (CaCPR1 and CaCPR2) were isolated from hot pepper (Capsicum annuum L. cv. Bukang). At the red ripe stage, the expression level of CaCPR1 was more than 6-fold greater than that in leaves or flowers. It gradually increased during fruit ripening. The CaCPR2 gene seemed to be expressed constitutively in all of the tested tissues. To investigate the enzymatic properties of CaCPR1, the cDNA of CaCPR1 was heterologously expressed in Escherichia coli without any modification of amino acid sequences, and CaCPR1 was purified. The enzymatic properties of CaCPR1 were confirmed using cytochrome c and cytochrome b5 as protein substrates. The CaCPR1 could support human CYP1A2-catalyzed reaction. It also reduced tetrazolium salts and ferricyanide. These results show that CaCPR1 is the major CPR in most hot pepper tissues. It is suggested that the CaCPR1 can be used a prototype for studying biological functions and biotechnological applications of plant CPRs.
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Affiliation(s)
- Ga-Young Lee
- School of Biological Sciences and Technology, Chonnam National University, Gwangju 500-757, Republic of Korea
| | - Hyun Min Kim
- School of Biological Sciences and Technology, Chonnam National University, Gwangju 500-757, Republic of Korea
| | - Sang Hoon Ma
- School of Biological Sciences and Technology, Chonnam National University, Gwangju 500-757, Republic of Korea
| | - Se Hee Park
- School of Biological Sciences and Technology, Chonnam National University, Gwangju 500-757, Republic of Korea
| | - Young Hee Joung
- School of Biological Sciences and Technology, Chonnam National University, Gwangju 500-757, Republic of Korea.
| | - Chul-Ho Yun
- School of Biological Sciences and Technology, Chonnam National University, Gwangju 500-757, Republic of Korea.
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Lee GY, Kim DH, Kim D, Ahn T, Yun CH. Functional characterization of steroid hydroxylase CYP106A1 derived from Bacillus megaterium. Arch Pharm Res 2014; 38:98-107. [PMID: 24988988 DOI: 10.1007/s12272-014-0366-9] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2013] [Accepted: 03/07/2014] [Indexed: 11/30/2022]
Abstract
In this study, we examined the catalytic activity of CYP106A1 from the Bacillus megaterium American Type Culture Collection 14581 strain. The CYP106A1 gene was cloned from B. megaterium, heterologously expressed in Escherichia coli, and purified. Potential electron partners and possible bacterial CYP106A1 substrates were identified by examining the oxidative activity toward a set of steroids in the presence of several reductase systems. The activities of CYP106A1 in a reconstituted system could not be achieved using rat NADPH-P450 reductase or a putidaredoxin reductase-putidaredoxin pair. However, the spinach redox proteins, a ferredoxin reductase-ferredoxin pair, were found to be efficient redox partners for CYP106A1. CYP106A1 catalyzes the hydroxylation of a set of steroids including testosterone, progesterone, 17α-hydroxyprogesterone, 11-deoxycorticosterone, corticosterone, and 11-deoxycortisol to produce monohydroxylated products as the major metabolites. These results suggest that CYP106A1 would be useful for the bioconversion of steroid hormones to hydroxylated products that can be used for industrial applications.
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Affiliation(s)
- Ga-Young Lee
- School of Biological Sciences and Technology, Chonnam National University, Kwangju, 500-757, Republic of Korea
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6
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Varfaj F, Zulkifli SNA, Park HG, Challinor VL, De Voss JJ, Ortiz de Montellano PR. Carbon-carbon bond cleavage in activation of the prodrug nabumetone. Drug Metab Dispos 2014; 42:828-38. [PMID: 24584631 DOI: 10.1124/dmd.114.056903] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Carbon-carbon bond cleavage reactions are catalyzed by, among others, lanosterol 14-demethylase (CYP51), cholesterol side-chain cleavage enzyme (CYP11), sterol 17β-lyase (CYP17), and aromatase (CYP19). Because of the high substrate specificities of these enzymes and the complex nature of their substrates, these reactions have been difficult to characterize. A CYP1A2-catalyzed carbon-carbon bond cleavage reaction is required for conversion of the prodrug nabumetone to its active form, 6-methoxy-2-naphthylacetic acid (6-MNA). Despite worldwide use of nabumetone as an anti-inflammatory agent, the mechanism of its carbon-carbon bond cleavage reaction remains obscure. With the help of authentic synthetic standards, we report here that the reaction involves 3-hydroxylation, carbon-carbon cleavage to the aldehyde, and oxidation of the aldehyde to the acid, all catalyzed by CYP1A2 or, less effectively, by other P450 enzymes. The data indicate that the carbon-carbon bond cleavage is mediated by the ferric peroxo anion rather than the ferryl species in the P450 catalytic cycle. CYP1A2 also catalyzes O-demethylation and alcohol to ketone transformations of nabumetone and its analogs.
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Affiliation(s)
- Fatbardha Varfaj
- Department of Pharmaceutical Chemistry, University of California, San Francisco, California (F.V., H.P., P.R.O.M.); Department of Chemistry, University of Queensland, St. Lucia, Brisbane, Australia (S.N.A.Z., V.L.C., J.J.D.V.); and Department of Biological Sciences, Konkuk University, Seoul, Korea (H.P.)
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McDougle DR, Palaria A, Magnetta E, Meling DD, Das A. Functional studies of N-terminally modified CYP2J2 epoxygenase in model lipid bilayers. Protein Sci 2014; 22:964-79. [PMID: 23661295 DOI: 10.1002/pro.2280] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2013] [Revised: 04/18/2013] [Accepted: 05/04/2013] [Indexed: 01/14/2023]
Abstract
CYP2J2 epoxygenase is a membrane bound cytochrome P450 that converts omega-3 and omega-6 fatty acids into physiologically active epoxides. In this work, we present a comprehensive comparison of the effects of N-terminal modifications on the properties of CYP2J2 with respect to the activity of the protein in model lipid bilayers using Nanodiscs. We demonstrate that the complete truncation of the N-terminus changes the association of this protein with the E.coli membrane but does not disrupt incorporation in the lipid bilayers of Nanodiscs. Notably, the introduction of silent mutations at the N-terminus was used to express full length CYP2J2 in E. coli while maintaining wild-type functionality. We further show that lipid bilayers are essential for the productive use of NADPH for ebastine hydroxylation by CYP2J2. Taken together, it was determined that the presence of the N-terminus is not as critical as the presence of a membrane environment for efficient electron transfer from cytochrome P450 reductase to CYP2J2 for ebastine hydroxylation in Nanodiscs. This suggests that adopting the native-like conformation of CYP2J2 and cytochrome P450 reductase in lipid bilayers is essential for effective use of reducing equivalents from NADPH for ebastine hydroxylation.
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Affiliation(s)
- Daniel R McDougle
- Department of Comparative Biosciences, University of Illinois Urbana-Champaign, Urbana, Illinois 61802, USA
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8
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Zelasko S, Palaria A, Das A. Optimizations to achieve high-level expression of cytochrome P450 proteins using Escherichia coli expression systems. Protein Expr Purif 2013; 92:77-87. [DOI: 10.1016/j.pep.2013.07.017] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2013] [Revised: 07/26/2013] [Accepted: 07/30/2013] [Indexed: 12/18/2022]
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9
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Kim DK, Kim YH, Jang HH, Park J, Kim JR, Koh M, Jeong WI, Koo SH, Park TS, Yun CH, Park SB, Chiang JYL, Lee CH, Choi HS. Estrogen-related receptor γ controls hepatic CB1 receptor-mediated CYP2E1 expression and oxidative liver injury by alcohol. Gut 2013; 62:1044-54. [PMID: 23023167 PMCID: PMC3812689 DOI: 10.1136/gutjnl-2012-303347] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
BACKGROUND The hepatic endocannabinoid system and cytochrome P450 2E1 (CYP2E1), a key enzyme causing alcohol-induced reactive oxygen species (ROS) generation, are major contributors to the pathogenesis of alcoholic liver disease. The nuclear hormone receptor oestrogen-related receptor γ (ERRγ) is a constitutively active transcriptional activator regulating gene expression. OBJECTIVE To investigate the role of ERRγ in the alcohol-mediated regulation of CYP2E1 and to examine the possibility to control alcohol-mediated oxidative stress and liver injury through an ERRγ inverse agonist. DESIGN For chronic alcoholic hepatosteatosis study, C57BL/6J wild-type and CB1(-/-) mice were administered alcohol for 4 weeks. GSK5182 and chlormethiazole (CMZ) were given by oral gavage for the last 2 weeks of alcohol feeding. Gene expression profiles and biochemical assays were performed using the liver or blood of mice. RESULTS Hepatic ERRγ gene expression induced by alcohol-mediated activation of CB1 receptor results in induction of CYP2E1, while liver-specific ablation of ERRγ gene expression blocks alcohol-induced expression of CYP2E1 in mouse liver. An ERRγ inverse agonist significantly ameliorates chronic alcohol-induced liver injury in mice through inhibition of CYP2E1-mediated generation of ROS, while inhibition of CYP2E1 by CMZ abrogates the beneficial effects of the inverse agonist. Finally, chronic alcohol-mediated ERRγ and CYP2E1 gene expression, ROS generation and liver injury in normal mice were nearly abolished in CB1(-/-) mice. CONCLUSIONS ERRγ, as a previously unrecognised transcriptional regulator of hepatic CB1 receptor, controls alcohol-induced oxidative stress and liver injury through CYP2E1 induction, and its inverse agonist could ameliorate oxidative liver injury due to chronic alcohol exposure.
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Affiliation(s)
- Don-Kyu Kim
- National Creative Research Initiatives Center for Nuclear Receptor Signals, Hormone Research Center, Gwangju, Republic of Korea
,School of Biological Sciences and Technology, Chonnam National University, Gwangju, Republic of Korea
| | - Yong-Hoon Kim
- Korea Research Institute of Bioscience and Biotechnology, Daejeon, Republic of Korea
| | - Hyun-Hee Jang
- School of Biological Sciences and Technology, Chonnam National University, Gwangju, Republic of Korea
| | - Jinyoung Park
- Department of Molecular Cell Biology and Samsung Biomedical Research Institute, Sungkyunkwan University School of Medicine, Suwon, Gyeonggi-do, Republic of Korea
| | - Jung Ran Kim
- Department of Life Science, Gachon University, Sungnam, Gyeonggi-do, Republic of Korea
| | - Minseob Koh
- Department of Chemistry, Seoul National University, Seoul, Republic of Korea
| | - Won-Il Jeong
- Graduate School of Medical Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon, Republic of Korea
| | - Seung-Hoi Koo
- Department of Molecular Cell Biology and Samsung Biomedical Research Institute, Sungkyunkwan University School of Medicine, Suwon, Gyeonggi-do, Republic of Korea
| | - Tae-Sik Park
- Department of Life Science, Gachon University, Sungnam, Gyeonggi-do, Republic of Korea
| | - Chul-Ho Yun
- School of Biological Sciences and Technology, Chonnam National University, Gwangju, Republic of Korea
| | - Seung Bum Park
- Department of Chemistry, Seoul National University, Seoul, Republic of Korea
,Department of Biophysics and Chemical Biology, College of Natural Sciences, Seoul National University, Seoul, Republic of Korea
| | - John Y L Chiang
- Department of Integrative Medical Sciences, Northeast Ohio Medical University, Rootstown, Ohio, USA
| | - Chul-Ho Lee
- Korea Research Institute of Bioscience and Biotechnology, Daejeon, Republic of Korea
| | - Hueng-Sik Choi
- National Creative Research Initiatives Center for Nuclear Receptor Signals, Hormone Research Center, Gwangju, Republic of Korea
,School of Biological Sciences and Technology, Chonnam National University, Gwangju, Republic of Korea
,Department of Biomedical Sciences, Research Institute of Medical Sciences, Chonnam National University Medical School, Gwangju, Republic of Korea
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10
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Lu HY, Qiu LL, Yang XJ, Zhang XM, Zhang Z, Wang SL. Optimization of heme precursors for the expression of human cytochrome P450 2A13 and its co-expression with oxidoreductase in baculovirus/sf9 system. J Biochem 2013; 153:555-63. [DOI: 10.1093/jb/mvt018] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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11
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Geier M, Braun A, Emmerstorfer A, Pichler H, Glieder A. Production of human cytochrome P450 2D6 drug metabolites with recombinant microbes - a comparative study. Biotechnol J 2012; 7:1346-58. [DOI: 10.1002/biot.201200187] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2012] [Revised: 07/31/2012] [Accepted: 08/24/2012] [Indexed: 01/11/2023]
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12
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Behrendorff JBYH, Moore CD, Kim KH, Kim DH, Smith CA, Johnston WA, Yun CH, Yost GS, Gillam EMJ. Directed evolution reveals requisite sequence elements in the functional expression of P450 2F1 in Escherichia coli. Chem Res Toxicol 2012; 25:1964-74. [PMID: 22901340 DOI: 10.1021/tx300281g] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Cytochrome P450 2F1 (P450 2F1) is expressed exclusively in the human respiratory tract and is implicated in 3-methylindole (3MI)-induced pneumotoxicity via dehydrogenation of 3MI to a reactive electrophilic intermediate, 3-methyleneindolenine (3-MEI). Studies of P450 2F1 to date have been limited by the failure to express this enzyme in Escherichia coli. By contrast, P450 2F3, a caprine homologue that shares 84% sequence identity with P450 2F1 (86 amino acid differences), has been expressed in E. coli at yields greater than 250 nmol/L culture. We hypothesized that a limited number of sequence differences between P450s 2F1 and 2F3 could limit P450 2F1 expression in E. coli and that problematic P450 2F1 sequence elements could be identified by directed evolution. A library of P450 2F1/2F3 mutants was created by DNA family shuffling and screened for expression in E. coli. Three generations of DNA shuffling revealed a mutant (named JH_2F_F3_1_007) with 96.5% nucleotide sequence identity to P450 2F1 and which expressed 119 ± 40 pmol (n = 3, mean ± SD) hemoprotein in 1 mL microaerobic cultures. Across all three generations, two regions were observed where P450 2F3-derived sequence was consistently substituted for P450 2F1 sequence in expressing mutants, encoding nine amino acid differences between P450s 2F1 and 2F3: nucleotides 191-278 (amino acids 65-92) and 794-924 (amino acids 265-305). Chimeras constructed to specifically test the importance of these two regions confirmed that P450 2F3 sequence is essential in both regions for expression in E. coli but that other non-P450 2F1 sequence elements outside of these regions also improved the expression of mutant JH_2F_F3_1_007. Mutant JH_2F_F3_1_007 catalyzed the dehydrogenation of 3MI to 3-MEI as indicated by the observation of glutathione adducts after incubation in the presence of glutathione. The JH_2F_F3_1_007 protein differs from P450 2F1 at only 20 amino acids and should facilitate further studies of the structure-activity relationships of P450s of the 2F subfamily.
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Affiliation(s)
- James B Y H Behrendorff
- School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia, Brisbane 4072, Australia
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Jang HH, Kim SY, Kang JY, Park SH, Ryu SH, Ahn T, Yun CH. Increase of human CYP1B1 activities by acidic phospholipids and kinetic deuterium isotope effects on CYP1B1 substrate oxidation. J Biochem 2012; 152:433-42. [PMID: 22888116 DOI: 10.1093/jb/mvs087] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
The effect of phospholipids on the kinetic parameters of three substrates, 7-ethoxy-4 -(trifluoromethyl)coumarin (7-EFC), 7-ethoxycoumarin (7-EC) and 17β-estradiol (E(2)), of human CYP1B1 was studied. In general, anionic phospholipids, phosphatidic acid and cardiolipin increased catalytic efficiency by increasing k(cat) values or decreasing K(m) values. The advantages of using the 7-EFC as a substrate over 7-EC and E(2) include high k(cat), low K(m) and high catalytic efficiency. Spectral binding titrations indicated that the binding affinity of 7-EFC to CYP1B1 in the presence or absence of phospholipids is higher than that of 7-EC or E(2). Furthermore, phosphatidylcholine increased the binding affinity of the substrates to the CYP1B1. High non-competitive intermolecular kinetic deuterium isotope effects (values 5.4-12) were observed for O-deethylation of 7-EFC and 7-EC with deuterium substitution at the ethoxy group, indicating that the C-H bond-breaking step makes a major contribution to the rate of these CYP1B1-catalyzed reactions. However, the intermolecular kinetic deuterium isotope effect is ~2 for the E(2) 4-hydroxylation reaction, indicating that the C-H bond-breaking step contributes only partially to the rate of this CYP1B1-catalyzed reaction. These results indicate that the reaction mechanism of CYP1B1-catalyzed reactions is distinct for each substrate.
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Affiliation(s)
- Hyun-Hee Jang
- School of Biological Sciences and Technology, Chonnam National University, Gwangju 500-757, Republic of Korea
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Phenacetin O-deethylation is a useful tool for evaluation of hepatic functional reserve in rats with CCl(4)-induced chronic liver injury. J Surg Res 2012; 175:e61-6. [PMID: 22341342 DOI: 10.1016/j.jss.2011.11.1037] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2011] [Revised: 11/01/2011] [Accepted: 11/29/2011] [Indexed: 11/21/2022]
Abstract
BACKGROUND Mortality of liver resection is as high as 3.1% to 25% in patients with chronic liver disease. Evaluation of hepatic functional reserve is critical for the prediction of risk of postoperation death. Phenacetin O-deethylation is a marker reaction of cytochrome P4501A2 (CYP1A2) activity. In this study, our aim is to investigate whether phenacetin O-deethylation is a useful tool for the evaluation of hepatic functional reserve in rats with chronic liver injury. MATERIALS AND METHODS Rat model for chronic liver injury was established by subcutaneous administration of 50% CCl(4), 1 mL/kg twice per week for 12 wk. Hepatic CYP1A2 activity, content, and mRNA expression were determined (n = 10). Effects of 15%, 30%, and 45% hepatectomy on phenacetin O-deethylation were evaluated in the rats (n = 5 in each group). Additionally, the correlation of risk of death after 70% hepatectomy with phenacetin O-deethylation was studied in 27 rats with chronic liver injury. RESULTS Compared with normal controls, CYP1A2 activity, content, and mRNA expression decreased 33%, 60%, and 50% in the rats with chronic liver injury (P < 0.05), respectively. Following the increasing of liver-resected size, CYP1A2 activity decreased proportionally (r(s) = -0.877, P < 0.05). Six of 27 rats with chronic liver injury died within 7 d after 70% hepatectomy. Phenacetin metabolism was impaired more severely in 6 rats that died than in 21 living rats (P < 0.05). CONCLUSIONS Phenacetin O-deethylation is a useful tool for the evaluation of hepatic functional reserve in the rats with CCl(4)-induced chronic liver injury.
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Comparison of microbial hosts and expression systems for mammalian CYP1A1 catalysis. J Ind Microbiol Biotechnol 2011; 39:275-87. [PMID: 21863302 DOI: 10.1007/s10295-011-1026-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2011] [Accepted: 08/04/2011] [Indexed: 10/17/2022]
Abstract
Mammalian cytochrome P450 enzymes are of special interest as biocatalysts for fine chemical and drug metabolite synthesis. In this study, the potential of different recombinant microorganisms expressing rat and human cyp1a1 genes is evaluated for such applications. The maximum specific activity for 7-ethoxyresorufin O-deethylation and gene expression levels were used as parameters to judge biocatalyst performance. Under comparable conditions, E. coli is shown to be superior over the use of S. cerevisiae and P. putida as hosts for biocatalysis. Of all tested E. coli strains, E. coli DH5α and E. coli JM101 harboring rat CYP1A1 showed the highest activities (0.43 and 0.42 U g⁻¹(CDW), respectively). Detection of active CYP1A1 in cell-free E. coli extracts was found to be difficult and only for E. coli DH5α, expression levels could be determined (41 nmol g⁻¹(CDW)). The presented results show that efficient expression of mammalian cyp1a1 genes in recombinant microorganisms is troublesome and host-dependent and that enhancing expression levels is crucial in order to obtain more efficient biocatalysts. Specific activities currently obtained are not sufficient yet for fine chemical production, but are sufficient for preparative-scale drug metabolite synthesis.
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Kang JY, Kim SY, Kim D, Kim DH, Shin SM, Park SH, Kim KH, Jung HC, Pan JG, Joung YH, Chi YT, Chae HZ, Ahn T, Yun CH. Characterization of diverse natural variants of CYP102A1 found within a species of Bacillus megaterium. AMB Express 2011; 1:1. [PMID: 21906327 PMCID: PMC3159907 DOI: 10.1186/2191-0855-1-1] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2010] [Accepted: 03/28/2011] [Indexed: 12/03/2022] Open
Abstract
An extreme diversity of substrates and catalytic reactions of cytochrome P450 (P450) enzymes is considered to be the consequence of evolutionary adaptation driven by different metabolic or environmental demands. Here we report the presence of numerous natural variants of P450 BM3 (CYP102A1) within a species of Bacillus megaterium. Extensive amino acid substitutions (up to 5% of the total 1049 amino acid residues) were identified from the variants. Phylogenetic analyses suggest that this P450 gene evolve more rapidly than the rRNA gene locus. It was found that key catalytic residues in the substrate channel and active site are retained. Although there were no apparent variations in hydroxylation activity towards myristic acid (C14) and palmitic acid (C16), the hydroxylation rates of lauric acid (C12) by the variants varied in the range of >25-fold. Interestingly, catalytic activities of the variants are promiscuous towards non-natural substrates including human P450 substrates. It can be suggested that CYP102A1 variants can acquire new catalytic activities through site-specific mutations distal to the active site.
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Production of human phase 1 and 2 metabolites by whole-cell biotransformation with recombinant microbes. Bioanalysis 2011; 2:1277-90. [PMID: 21083240 DOI: 10.4155/bio.10.80] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
Cytochrome P450 enzymes (CYPs or P450s) are the most important enzymes involved in the phase I metabolism of drugs and poisons in humans, while UDP glycosyltransferases catalyze the majority of phase II reactions. In addition, a number of other enzymes or enzyme families contribute to the metabolism of xenobiotica, including alcohol dehydrogenase, aldehyde dehydrogenase, ester and amide hydrolases, epoxide hydrolase and flavine monooxygenases, as well as sulfotransferases, catechol-O-methyltransferase and N-acetyltransferase. A thorough understanding of their activity and of the properties of the metabolites they form is an essential prerequisite for the assessment of drug-caused side effects or toxicity. In this context of MIST, efficient production systems are needed to permit the large-scale production of human drug metabolites. As classical chemical synthesis cannot always provide these metabolites, biotechnological approaches have been developed that typically employ the recombinant expression of human drug-metabolizing enzymes. This review summarizes the current knowledge regarding whole-cell biotransformation processes that make use of such an approach.
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Neunzig I, Drăgan CA, Widjaja M, Schwaninger AE, Peters FT, Maurer HH, Bureik M. Whole-cell biotransformation assay for investigation of the human drug metabolizing enzyme CYP3A7. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2011; 1814:161-7. [DOI: 10.1016/j.bbapap.2010.07.011] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/09/2010] [Revised: 06/28/2010] [Accepted: 07/07/2010] [Indexed: 11/17/2022]
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Kim KH, Kang JY, Kim DH, Park SH, Park SH, Kim D, Park KD, Lee YJ, Jung HC, Pan JG, Ahn T, Yun CH. Generation of Human Chiral Metabolites of Simvastatin and Lovastatin by Bacterial CYP102A1 Mutants. Drug Metab Dispos 2010; 39:140-50. [DOI: 10.1124/dmd.110.036392] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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Kim DH, Kim KH, Kim D, Jung HC, Pan JG, Chi YT, Ahn T, Yun CH. Oxidation of human cytochrome P450 1A2 substrates by Bacillus megaterium cytochrome P450 BM3. ACTA ACUST UNITED AC 2010. [DOI: 10.1016/j.molcatb.2010.01.017] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Wang XR, Qu ZQ, Li XD, Liu HL, He P, Fang BX, Xiao J, Huang W, Wu MC. Activity of sulfotransferase 1A1 is dramatically upregulated in patients with hepatocellular carcinoma secondary to chronic hepatitis B virus infection. Cancer Sci 2010; 101:412-5. [PMID: 19906068 PMCID: PMC11159829 DOI: 10.1111/j.1349-7006.2009.01404.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
The phase I metabolizing enzyme and phase II metabolizing enzyme play vital roles in carcinogenesis, but little is known about the changes of their activities in patients with hepatocellular carcinoma (HCC) secondary to chronic hepatitis B virus (HBV) infection. In this study phenacetin, a probe drug (1 g for men and 0.85 g for women orally), was applied for the detection of sulfotransferase 1A1 (SULT1A1) and cytochrome P4501A2 (CYP1A2) activities in 82 healthy participants and 148 HCC, 106 cirrhosis, and 41 chronic hepatitis B patients. In addition, a prospective cohort study for susceptibility to HCC was performed in 205 patients with cirrhosis secondary to chronic HBV infection. Compared with the healthy participants, SLUT1A1 activity increased by 9.7-fold in the HCC patients (P < 0.01). CYP1A2 activity did not significantly differ between the healthy participants and HCC patients. CYP1A2 activity decreased by 91.2% (P < 0.01) and 67.7% (P < 0.05) in the patients with cirrhosis and chronic hepatitis B, respectively; SULT1A1 activity did not increase significantly. During an approximate 2-year follow up, three of the 46 cirrhosis patients with elevated SULT1A1 activity and normal CYP1A2 activity developed HCC, but none of the 159 cirrhosis patients used as parallel controls did (P = 0.012). These results indicate that SLUT1A1 activity is dramatically upregulated in patients with HCC secondary to chronic HBV infection. The upregulation of SULT1A1 activity is not caused by the tumor itself. The interaction between SULT1A1 and CYP1A2 can play an important role in hepatocarcinogenesis in the Chinese population.
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Affiliation(s)
- Xiang-Rui Wang
- Renji Hospital, Shanghai Jiaotong University, Shanghai, China
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Deb S, Bandiera SM. Characterization and expression of extrahepatic CYP2S1. Expert Opin Drug Metab Toxicol 2010; 5:367-80. [PMID: 19368491 DOI: 10.1517/17425250902865586] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
BACKGROUND About one-third of the CYP enzymes identified so far, including several novel CYP enzymes such as CYP2S1, CYP2U1 and CYP2W1, belong to the CYP2 family. As with other recently discovered CYP enzymes, detailed information about the catalytic activity and function of CYP2S1 is lacking. OBJECTIVE To review and compare the expression of CYP2S1 mRNA and protein in humans, mice and rats, and to critically examine evidence pertaining to CYP2S1 regulation and its catalytic activity. METHODS Information about mouse and human CYP2S1 was summarized from published reports. Data about rat CYP2S1 expression was taken from recent work by the authors. RESULTS/CONCLUSIONS CYP2S1 shares molecular characteristics of both CYP1 and CYP2 family enzymes but shows a unique tissue profile of expression. Further studies are needed to identify selective substrates and to measure CYP2S1 protein levels before the role of CYP2S1 in xenobiotic metabolism and its relevance to physiological pathways and disease states can be determined.
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Affiliation(s)
- Subrata Deb
- University of British Columbia, Faculty of Pharmaceutical Sciences, 2146 East Mall, Vancouver, British Columbia, V6T 1Z3, Canada
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Messina A, Chirulli V, Gervasi PG, Longo V. Purification, molecular cloning, heterologous expression and characterization of pig CYP1A2. Xenobiotica 2009; 38:1453-70. [PMID: 18949657 DOI: 10.1080/00498250802474437] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Porcine cytochrome P450 (CYP) 1A2 was purified to electrophoretic homogeneity from the hepatic microsomes of beta-naphthoflavone-treated male pigs. In a reconstituted system, this enzyme showed a good catalytic activity towards caffeine, acetanilide, and methoxyresorufin, all known markers of mammalian CYP1A2. Using 3'- and 5'-rapid amplification of coding DNA (cDNA) ends (RACE), we amplified from the liver RNA of control pigs a full-length 1827 bp cDNA containing an open reading frame of 1548 bp which encoded a putative CYP1A2 protein of 516 amino acids and an estimated Mr of 58 380 Da. Reverse transcriptase-polymerase chain reaction (RT-PCR) experiments showed that the messenger RNA (mRNA) of CYP1A2 was expressed in liver, heart and nasal mucosa but not in lung, small intestine, kidney and brain. Using the pCW vector containing a N-terminal modified cDNA, pig CYP1A2 was expressed in Escherichia coli. 3-[(3-Chloroamidopropyl)dimethylmmonio]-1-propane-sulfonate (CHAPS)-solubilized E. coli preparations expressing CYP1A2 produced a functionally isoform which, in a reconstituted system, was catalytically active toward ethoxyresorufin and methoxyresorufin showing K(m)'s similar to those obtained with CYP1A2 purified from pig liver or human recombinant CYP1A2. Taken together, these results demonstrate that domestic pigs have a functionally active CYP1A2 gene well expressed in the liver with biochemical properties quite similar to those corresponding to the human enzyme.
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Affiliation(s)
- A Messina
- Istituto di Fisiologia Clinica, Area della Ricerca CNR, Pisa, Italy
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Julsing MK, Cornelissen S, Bühler B, Schmid A. Heme-iron oxygenases: powerful industrial biocatalysts? Curr Opin Chem Biol 2008; 12:177-86. [DOI: 10.1016/j.cbpa.2008.01.029] [Citation(s) in RCA: 142] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2007] [Revised: 01/18/2008] [Accepted: 01/18/2008] [Indexed: 11/24/2022]
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