1
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Loughran HM, Schirripa KM, Roecker AJ, Breslin MJ, Tong L, Fillgrove KL, Kuo Y, Bleasby K, Collier H, Altman MD, Ford MC, Newman JA, Drolet RE, Cosden M, Jinn S, Flick RB, Liu X, Minnick C, Watt ML, Lemaire W, Burlein C, Adam GC, Austin LA, Marcus JN, Smith SM, Fraley ME. Fluorinated Isoindolinone-Based Glucosylceramide Synthase Inhibitors with Low Human Dose Projections. ACS Med Chem Lett 2024; 15:123-131. [PMID: 38229758 PMCID: PMC10788949 DOI: 10.1021/acsmedchemlett.3c00436] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2023] [Revised: 12/12/2023] [Accepted: 12/14/2023] [Indexed: 01/18/2024] Open
Abstract
Inhibition of glucosylceramide synthase (GCS) has been proposed as a therapeutic strategy for the treatment of Parkinson's Disease (PD), particularly in patients where glycosphingolipid accumulation and lysosomal impairment are thought to be contributing to disease progression. Herein, we report the late-stage optimization of an orally bioavailable and CNS penetrant isoindolinone class of GCS inhibitors. Starting from advanced lead 1, we describe efforts to identify an improved compound with a lower human dose projection, minimal P-glycoprotein (P-gp) efflux, and acceptable pregnane X receptor (PXR) profile through fluorine substitution. Our strategy involved the use of predicted volume ligand efficiency to advance compounds with greater potential for low human doses down our screening funnel. We also applied minimized electrostatic potentials (Vmin) calculations for hydrogen bond acceptor sites to rationalize P-gp SAR. Together, our strategies enabled the alignment of a lower human dose with reduced P-gp efflux, and favorable PXR selectivity for the discovery of compound 12.
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Affiliation(s)
| | | | | | | | - Ling Tong
- Merck
& Co., Inc., West Point, Pennsylvania 19486, United States
| | | | - Yuhsin Kuo
- Merck
& Co., Inc., West Point, Pennsylvania 19486, United States
| | - Kelly Bleasby
- Merck
& Co., Inc., West Point, Pennsylvania 19486, United States
| | - Hannah Collier
- Merck
& Co., Inc., Rahway, New Jersey 07065, United States
| | | | - Melissa C. Ford
- Merck
& Co., Inc., West Point, Pennsylvania 19486, United States
| | | | - Robert E. Drolet
- Merck
& Co., Inc., West Point, Pennsylvania 19486, United States
| | - Mali Cosden
- Merck
& Co., Inc., West Point, Pennsylvania 19486, United States
| | - Sarah Jinn
- Merck
& Co., Inc., West Point, Pennsylvania 19486, United States
| | | | - Xiaomei Liu
- Merck
& Co., Inc., West Point, Pennsylvania 19486, United States
| | | | - Marla L. Watt
- Merck
& Co., Inc., West Point, Pennsylvania 19486, United States
| | - Wei Lemaire
- Merck
& Co., Inc., West Point, Pennsylvania 19486, United States
| | | | - Gregory C. Adam
- Merck
& Co., Inc., West Point, Pennsylvania 19486, United States
| | - Lauren A. Austin
- Merck
& Co., Inc., West Point, Pennsylvania 19486, United States
| | - Jacob N. Marcus
- Merck
& Co., Inc., West Point, Pennsylvania 19486, United States
| | - Sean M. Smith
- Merck
& Co., Inc., West Point, Pennsylvania 19486, United States
| | - Mark E. Fraley
- Merck
& Co., Inc., West Point, Pennsylvania 19486, United States
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2
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Rudd MT, Manley PJ, Hanney B, Meng Z, Shu Y, de Leon P, Frie JL, Han Y, Wai JMC, Yang ZQ, Perkins JJ, Hurzy DM, Manikowski JJ, Zhu H, Bungard CJ, Converso A, Meissner RS, Cosden ML, Hayashi I, Ma L, O’Brien J, Uebele VN, Schachter JB, Bhandari N, Ward GJ, Fillgrove KL, Lu B, Liang Y, Dubost DC, Puri V, Eddins DM, Vardigan JD, Drolet RE, Kern JT, Uslaner JM. Discovery of MK-8768, a Potent and Selective mGluR2 Negative Allosteric Modulator. ACS Med Chem Lett 2023; 14:1088-1094. [PMID: 37583812 PMCID: PMC10424309 DOI: 10.1021/acsmedchemlett.3c00210] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2023] [Accepted: 06/29/2023] [Indexed: 08/17/2023] Open
Abstract
Glutamate plays a key role in cognition and mood, and it has been shown that inhibiting ionotropic glutamate receptors disrupts cognition, while enhancing ionotropic receptor activity is pro-cognitive. One approach to elevating glutamatergic tone has been to antagonize presynaptic metabotropic glutamate receptor 2 (mGluR2). A desire for selectivity over the largely homologous mGluR3 motivated a strategy to achieve selectivity through the identification of mGluR2 negative allosteric modulators (NAMs). Extensive screening and optimization efforts led to the identification of a novel series of 4-arylquinoline-2-carboxamides. This series was optimized for mGluR2 NAM potency, clean off-target activity, and desirable physical properties, which resulted in the identification of improved C4 and C7 substituents. The initial lead compound from this series was Ames-positive in a single strain with metabolic activation, indicating that a reactive metabolite was likely responsible for the genetic toxicity. Metabolic profiling and Ames assessment across multiple analogs identified key structure-activity relationships associated with Ames positivity. Further optimization led to the Ames-negative mGluR2 negative allosteric modulator MK-8768.
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Affiliation(s)
- Michael T. Rudd
- Departments
of Discovery Chemistry, Neuroscience Biology Discovery, Pharmacology, Nonclinical Dug
Safety, Pharmacokinetics, Discovery Pharmaceutical Sciences, and In Vivo Pharmacology, Merck & Co., Inc, West Point, Pennsylvania 19486, United States
| | - Peter J. Manley
- Departments
of Discovery Chemistry, Neuroscience Biology Discovery, Pharmacology, Nonclinical Dug
Safety, Pharmacokinetics, Discovery Pharmaceutical Sciences, and In Vivo Pharmacology, Merck & Co., Inc, West Point, Pennsylvania 19486, United States
| | - Barbara Hanney
- Departments
of Discovery Chemistry, Neuroscience Biology Discovery, Pharmacology, Nonclinical Dug
Safety, Pharmacokinetics, Discovery Pharmaceutical Sciences, and In Vivo Pharmacology, Merck & Co., Inc, West Point, Pennsylvania 19486, United States
| | - Zhaoyang Meng
- Departments
of Discovery Chemistry, Neuroscience Biology Discovery, Pharmacology, Nonclinical Dug
Safety, Pharmacokinetics, Discovery Pharmaceutical Sciences, and In Vivo Pharmacology, Merck & Co., Inc, West Point, Pennsylvania 19486, United States
| | - Youheng Shu
- Departments
of Discovery Chemistry, Neuroscience Biology Discovery, Pharmacology, Nonclinical Dug
Safety, Pharmacokinetics, Discovery Pharmaceutical Sciences, and In Vivo Pharmacology, Merck & Co., Inc, West Point, Pennsylvania 19486, United States
| | - Pablo de Leon
- Departments
of Discovery Chemistry, Neuroscience Biology Discovery, Pharmacology, Nonclinical Dug
Safety, Pharmacokinetics, Discovery Pharmaceutical Sciences, and In Vivo Pharmacology, Merck & Co., Inc, West Point, Pennsylvania 19486, United States
| | - Jessica L. Frie
- Departments
of Discovery Chemistry, Neuroscience Biology Discovery, Pharmacology, Nonclinical Dug
Safety, Pharmacokinetics, Discovery Pharmaceutical Sciences, and In Vivo Pharmacology, Merck & Co., Inc, West Point, Pennsylvania 19486, United States
| | - Yongxin Han
- External
Discovery Chemistry, Merck & Co., Inc, Boston, Massachusetts 02115, United States
| | - Jenny Miu-Chun Wai
- Departments
of Discovery Chemistry, Neuroscience Biology Discovery, Pharmacology, Nonclinical Dug
Safety, Pharmacokinetics, Discovery Pharmaceutical Sciences, and In Vivo Pharmacology, Merck & Co., Inc, West Point, Pennsylvania 19486, United States
| | - Zhi-Qiang Yang
- Departments
of Discovery Chemistry, Neuroscience Biology Discovery, Pharmacology, Nonclinical Dug
Safety, Pharmacokinetics, Discovery Pharmaceutical Sciences, and In Vivo Pharmacology, Merck & Co., Inc, West Point, Pennsylvania 19486, United States
| | - James J. Perkins
- Departments
of Discovery Chemistry, Neuroscience Biology Discovery, Pharmacology, Nonclinical Dug
Safety, Pharmacokinetics, Discovery Pharmaceutical Sciences, and In Vivo Pharmacology, Merck & Co., Inc, West Point, Pennsylvania 19486, United States
| | - Danielle M. Hurzy
- Departments
of Discovery Chemistry, Neuroscience Biology Discovery, Pharmacology, Nonclinical Dug
Safety, Pharmacokinetics, Discovery Pharmaceutical Sciences, and In Vivo Pharmacology, Merck & Co., Inc, West Point, Pennsylvania 19486, United States
| | - Jesse J. Manikowski
- Departments
of Discovery Chemistry, Neuroscience Biology Discovery, Pharmacology, Nonclinical Dug
Safety, Pharmacokinetics, Discovery Pharmaceutical Sciences, and In Vivo Pharmacology, Merck & Co., Inc, West Point, Pennsylvania 19486, United States
| | - Hong Zhu
- Departments
of Discovery Chemistry, Neuroscience Biology Discovery, Pharmacology, Nonclinical Dug
Safety, Pharmacokinetics, Discovery Pharmaceutical Sciences, and In Vivo Pharmacology, Merck & Co., Inc, West Point, Pennsylvania 19486, United States
| | - Christopher J. Bungard
- Departments
of Discovery Chemistry, Neuroscience Biology Discovery, Pharmacology, Nonclinical Dug
Safety, Pharmacokinetics, Discovery Pharmaceutical Sciences, and In Vivo Pharmacology, Merck & Co., Inc, West Point, Pennsylvania 19486, United States
| | - Antonella Converso
- Departments
of Discovery Chemistry, Neuroscience Biology Discovery, Pharmacology, Nonclinical Dug
Safety, Pharmacokinetics, Discovery Pharmaceutical Sciences, and In Vivo Pharmacology, Merck & Co., Inc, West Point, Pennsylvania 19486, United States
| | - Robert S. Meissner
- Departments
of Discovery Chemistry, Neuroscience Biology Discovery, Pharmacology, Nonclinical Dug
Safety, Pharmacokinetics, Discovery Pharmaceutical Sciences, and In Vivo Pharmacology, Merck & Co., Inc, West Point, Pennsylvania 19486, United States
| | - Mali L. Cosden
- Departments
of Discovery Chemistry, Neuroscience Biology Discovery, Pharmacology, Nonclinical Dug
Safety, Pharmacokinetics, Discovery Pharmaceutical Sciences, and In Vivo Pharmacology, Merck & Co., Inc, West Point, Pennsylvania 19486, United States
| | - Ikuo Hayashi
- Departments
of Discovery Chemistry, Neuroscience Biology Discovery, Pharmacology, Nonclinical Dug
Safety, Pharmacokinetics, Discovery Pharmaceutical Sciences, and In Vivo Pharmacology, Merck & Co., Inc, West Point, Pennsylvania 19486, United States
| | - Lei Ma
- Departments
of Discovery Chemistry, Neuroscience Biology Discovery, Pharmacology, Nonclinical Dug
Safety, Pharmacokinetics, Discovery Pharmaceutical Sciences, and In Vivo Pharmacology, Merck & Co., Inc, West Point, Pennsylvania 19486, United States
| | - Julie O’Brien
- Departments
of Discovery Chemistry, Neuroscience Biology Discovery, Pharmacology, Nonclinical Dug
Safety, Pharmacokinetics, Discovery Pharmaceutical Sciences, and In Vivo Pharmacology, Merck & Co., Inc, West Point, Pennsylvania 19486, United States
| | - Victor N. Uebele
- Departments
of Discovery Chemistry, Neuroscience Biology Discovery, Pharmacology, Nonclinical Dug
Safety, Pharmacokinetics, Discovery Pharmaceutical Sciences, and In Vivo Pharmacology, Merck & Co., Inc, West Point, Pennsylvania 19486, United States
| | - Joel B. Schachter
- Departments
of Discovery Chemistry, Neuroscience Biology Discovery, Pharmacology, Nonclinical Dug
Safety, Pharmacokinetics, Discovery Pharmaceutical Sciences, and In Vivo Pharmacology, Merck & Co., Inc, West Point, Pennsylvania 19486, United States
| | - Neetesh Bhandari
- Departments
of Discovery Chemistry, Neuroscience Biology Discovery, Pharmacology, Nonclinical Dug
Safety, Pharmacokinetics, Discovery Pharmaceutical Sciences, and In Vivo Pharmacology, Merck & Co., Inc, West Point, Pennsylvania 19486, United States
| | - Gwendolyn J. Ward
- Departments
of Discovery Chemistry, Neuroscience Biology Discovery, Pharmacology, Nonclinical Dug
Safety, Pharmacokinetics, Discovery Pharmaceutical Sciences, and In Vivo Pharmacology, Merck & Co., Inc, West Point, Pennsylvania 19486, United States
| | - Kerry L. Fillgrove
- Departments
of Discovery Chemistry, Neuroscience Biology Discovery, Pharmacology, Nonclinical Dug
Safety, Pharmacokinetics, Discovery Pharmaceutical Sciences, and In Vivo Pharmacology, Merck & Co., Inc, West Point, Pennsylvania 19486, United States
| | - Bing Lu
- Departments
of Discovery Chemistry, Neuroscience Biology Discovery, Pharmacology, Nonclinical Dug
Safety, Pharmacokinetics, Discovery Pharmaceutical Sciences, and In Vivo Pharmacology, Merck & Co., Inc, West Point, Pennsylvania 19486, United States
| | - Yuexia Liang
- Departments
of Discovery Chemistry, Neuroscience Biology Discovery, Pharmacology, Nonclinical Dug
Safety, Pharmacokinetics, Discovery Pharmaceutical Sciences, and In Vivo Pharmacology, Merck & Co., Inc, West Point, Pennsylvania 19486, United States
| | - David C. Dubost
- Departments
of Discovery Chemistry, Neuroscience Biology Discovery, Pharmacology, Nonclinical Dug
Safety, Pharmacokinetics, Discovery Pharmaceutical Sciences, and In Vivo Pharmacology, Merck & Co., Inc, West Point, Pennsylvania 19486, United States
| | - Vanita Puri
- Departments
of Discovery Chemistry, Neuroscience Biology Discovery, Pharmacology, Nonclinical Dug
Safety, Pharmacokinetics, Discovery Pharmaceutical Sciences, and In Vivo Pharmacology, Merck & Co., Inc, West Point, Pennsylvania 19486, United States
| | - Donnie M. Eddins
- Departments
of Discovery Chemistry, Neuroscience Biology Discovery, Pharmacology, Nonclinical Dug
Safety, Pharmacokinetics, Discovery Pharmaceutical Sciences, and In Vivo Pharmacology, Merck & Co., Inc, West Point, Pennsylvania 19486, United States
| | - Joshua D. Vardigan
- Departments
of Discovery Chemistry, Neuroscience Biology Discovery, Pharmacology, Nonclinical Dug
Safety, Pharmacokinetics, Discovery Pharmaceutical Sciences, and In Vivo Pharmacology, Merck & Co., Inc, West Point, Pennsylvania 19486, United States
| | - Robert E. Drolet
- Departments
of Discovery Chemistry, Neuroscience Biology Discovery, Pharmacology, Nonclinical Dug
Safety, Pharmacokinetics, Discovery Pharmaceutical Sciences, and In Vivo Pharmacology, Merck & Co., Inc, West Point, Pennsylvania 19486, United States
| | - Jonathan T. Kern
- Departments
of Discovery Chemistry, Neuroscience Biology Discovery, Pharmacology, Nonclinical Dug
Safety, Pharmacokinetics, Discovery Pharmaceutical Sciences, and In Vivo Pharmacology, Merck & Co., Inc, West Point, Pennsylvania 19486, United States
| | - Jason M. Uslaner
- Departments
of Discovery Chemistry, Neuroscience Biology Discovery, Pharmacology, Nonclinical Dug
Safety, Pharmacokinetics, Discovery Pharmaceutical Sciences, and In Vivo Pharmacology, Merck & Co., Inc, West Point, Pennsylvania 19486, United States
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3
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Roecker AJ, Schirripa KM, Loughran HM, Tong L, Liang T, Fillgrove KL, Kuo Y, Bleasby K, Collier H, Altman MD, Ford MC, Drolet RE, Cosden M, Jinn S, Hatcher NG, Yao L, Kandebo M, Vardigan JD, Flick RB, Liu X, Minnick C, Price LA, Watt ML, Lemaire W, Burlein C, Adam GC, Austin LA, Marcus JN, Smith SM, Fraley ME. Pyrazole Ureas as Low Dose, CNS Penetrant Glucosylceramide Synthase Inhibitors for the Treatment of Parkinson's Disease. ACS Med Chem Lett 2023; 14:146-155. [PMID: 36793422 PMCID: PMC9923837 DOI: 10.1021/acsmedchemlett.2c00441] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2022] [Accepted: 01/04/2023] [Indexed: 01/13/2023] Open
Abstract
Parkinson's disease is the second most prevalent progressive neurodegenerative disorder characterized by the loss of dopaminergic neurons in the substantia nigra. Loss-of-function mutations in GBA, the gene that encodes for the lysosomal enzyme glucosylcerebrosidase, are a major genetic risk factor for the development of Parkinson's disease potentially through the accumulation of glucosylceramide and glucosylsphingosine in the CNS. A therapeutic strategy to reduce glycosphingolipid accumulation in the CNS would entail inhibition of the enzyme responsible for their synthesis, glucosylceramide synthase (GCS). Herein, we report the optimization of a bicyclic pyrazole amide GCS inhibitor discovered through HTS to low dose, oral, CNS penetrant, bicyclic pyrazole urea GCSi's with in vivo activity in mouse models and ex vivo activity in iPSC neuronal models of synucleinopathy and lysosomal dysfunction. This was accomplished through the judicious use of parallel medicinal chemistry, direct-to-biology screening, physics-based rationalization of transporter profiles, pharmacophore modeling, and use a novel metric: volume ligand efficiency.
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Affiliation(s)
- Anthony J. Roecker
- Discovery
Chemistry, Merck & Co., Inc., West Point, Pennsylvania 19486, United States
| | - Kathy M. Schirripa
- Discovery
Chemistry, Merck & Co., Inc., West Point, Pennsylvania 19486, United States
| | - H. Marie Loughran
- Discovery
Chemistry, Merck & Co., Inc., West Point, Pennsylvania 19486, United States
| | - Ling Tong
- Discovery
Chemistry, Merck & Co., Inc., West Point, Pennsylvania 19486, United States
| | - Tao Liang
- Discovery
Process Chemistry, Merck & Co., Inc., Kenilworth, New Jersey 07033, United States
| | - Kerry L. Fillgrove
- ADME
& Discovery Toxicology, Merck &
Co., Inc., West Point, Pennsylvania 19486, United States
| | - Yuhsin Kuo
- ADME
& Discovery Toxicology, Merck &
Co., Inc., West Point, Pennsylvania 19486, United States
| | - Kelly Bleasby
- ADME
Transporters, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Hannah Collier
- ADME
Transporters, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Michael D. Altman
- Computational
and Structural Chemistry, Merck & Co.,
Inc., Boston, Massachusetts 02115, United States
| | - Melissa C. Ford
- Computational
and Structural Chemistry, Merck & Co.,
Inc., Boston, Massachusetts 02115, United States
| | - Robert E. Drolet
- Discovery
Biology, Merck & Co., Inc., West Point, Pennsylvania 19486, United States
| | - Mali Cosden
- Discovery
Biology, Merck & Co., Inc., West Point, Pennsylvania 19486, United States
| | - Sarah Jinn
- Discovery
Biology, Merck & Co., Inc., West Point, Pennsylvania 19486, United States
| | - Nathan G. Hatcher
- Discovery
Biology, Merck & Co., Inc., West Point, Pennsylvania 19486, United States
| | - Lihang Yao
- Discovery
Biology, Merck & Co., Inc., West Point, Pennsylvania 19486, United States
| | - Monika Kandebo
- Discovery
Biology, Merck & Co., Inc., West Point, Pennsylvania 19486, United States
| | - Joshua D. Vardigan
- Discovery
Biology, Merck & Co., Inc., West Point, Pennsylvania 19486, United States
| | - Rosemarie B. Flick
- Discovery
Biology, Merck & Co., Inc., West Point, Pennsylvania 19486, United States
| | - Xiaomei Liu
- Discovery
Biology, Merck & Co., Inc., West Point, Pennsylvania 19486, United States
| | - Christina Minnick
- Discovery
Biology, Merck & Co., Inc., West Point, Pennsylvania 19486, United States
| | - Laura A. Price
- Discovery
Biology, Merck & Co., Inc., West Point, Pennsylvania 19486, United States
| | - Marla L. Watt
- Discovery
Biology, Merck & Co., Inc., West Point, Pennsylvania 19486, United States
| | - Wei Lemaire
- Discovery
Biology, Merck & Co., Inc., West Point, Pennsylvania 19486, United States
| | - Christine Burlein
- Discovery
Biology, Merck & Co., Inc., West Point, Pennsylvania 19486, United States
| | - Gregory C. Adam
- Discovery
Biology, Merck & Co., Inc., West Point, Pennsylvania 19486, United States
| | - Lauren A. Austin
- Discovery
Pharmaceutical Sciences, Merck & Co.,
Inc., West Point, Pennsylvania 19486, United States
| | - Jacob N. Marcus
- Discovery
Biology, Merck & Co., Inc., West Point, Pennsylvania 19486, United States
| | - Sean M. Smith
- Discovery
Biology, Merck & Co., Inc., West Point, Pennsylvania 19486, United States
| | - Mark E. Fraley
- Discovery
Chemistry, Merck & Co., Inc., West Point, Pennsylvania 19486, United States
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4
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Ankrom W, Jackson Rudd D, Zhang S, Fillgrove KL, Gravesande KN, Matthews RP, Brimhall D, Stoch SA, Iwamoto MN. A phase 1, open-label study to evaluate the drug interaction between islatravir (MK-8591) and the oral contraceptive levonorgestrel/ethinyl estradiol in healthy adult females. J Int AIDS Soc 2021; 24:e25858. [PMID: 34935295 PMCID: PMC8692923 DOI: 10.1002/jia2.25858] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2021] [Accepted: 11/29/2021] [Indexed: 11/29/2022] Open
Abstract
Introduction Hormonal contraceptives are among the most effective forms of reversible contraception, but many other compounds, including some antiretrovirals, have clinically meaningful drug–drug interactions (DDIs) with hormonal contraceptives. Islatravir is a novel human immunodeficiency virus nucleoside reverse transcriptase translocation inhibitor currently in clinical development for treatment and prevention of HIV infection. A phase 1 clinical trial was conducted to evaluate the DDI of islatravir and the combination of oral contraceptive levonorgestrel (LNG)/ethinyl estradiol (EE). Methods This was an open‐label, two‐period, fixed‐sequence, DDI clinical trial in healthy, postmenopausal or bilaterally oophorectomized females aged 18 through 65 years in the United States between October 2016 and January 2017. A single dose of LNG 0.15 mg/EE 0.03 mg was given followed by a 7‐day washout. Islatravir, 20 mg, was then dosed once weekly for 3 weeks; a single dose of LNG 0.15 mg/EE 0.03 mg was given concomitantly with the third dose of islatravir. Pharmacokinetic samples for plasma LNG and EE concentrations were collected pre‐dose and up to 120 hours post‐dose in each period. Safety and tolerability were assessed throughout the trial by clinical assessments, laboratory evaluations and examination of adverse events. Results and Discussion Fourteen participants were enrolled. The pharmacokinetics of LNG and EE were not meaningfully altered by co‐administration with islatravir. For the comparison of (islatravir + LNG/EE)/(LNG/EE alone), the geometric mean ratios (GMRs) (90% confidence intervals [CIs]) for LNG AUC0–inf and Cmax were 1.13 (1.06, 1.20) and 0.965 (0.881, 1.06), respectively. For EE, the GMRs (90% CI) for AUC0–inf and Cmax were 1.05 (0.981, 1.11) and 1.02 (0.971, 1.08), respectively. Co‐administration of all three drugs was generally well tolerated. Conclusions The results of this trial support the use of LNG/EE contraceptives in combination with islatravir without dose adjustment.
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Affiliation(s)
- Wendy Ankrom
- Merck & Co., Inc., Merck Research Labs, Kenilworth, New Jersey, USA
| | | | - Saijuan Zhang
- Merck & Co., Inc., Merck Research Labs, Kenilworth, New Jersey, USA
| | | | | | | | | | - S Aubrey Stoch
- Merck & Co., Inc., Merck Research Labs, Kenilworth, New Jersey, USA
| | - Marian N Iwamoto
- Merck & Co., Inc., Merck Research Labs, Kenilworth, New Jersey, USA
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5
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Matthews RP, Jackson Rudd D, Zhang S, Fillgrove KL, Sterling LM, Grobler JA, Vargo RC, Stoch SA, Iwamoto M. Safety and Pharmacokinetics of Once-Daily Multiple-Dose Administration of Islatravir in Adults Without HIV. J Acquir Immune Defic Syndr 2021; 88:314-321. [PMID: 34651606 DOI: 10.1097/qai.0000000000002755] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2021] [Accepted: 05/24/2021] [Indexed: 11/26/2022]
Abstract
BACKGROUND Islatravir (MK-8591) is a novel nucleoside analog in development for the treatment and prevention of HIV-1 infection. Islatravir has potent antiviral activity and a long intracellular half-life. SETTING A 3-panel, randomized, double-blind, placebo-controlled, multiple-dose study in 36 adults without HIV evaluated the safety, tolerability, and pharmacokinetics of islatravir after daily administration. METHODS Islatravir or placebo was administered orally once daily for 42 days (5 mg) or 28 days (0.25 mg; 0.75 mg). Blood samples were taken at prespecified time points for pharmacokinetic analysis of islatravir (plasma) and islatravir-triphosphate (ISL-TP; peripheral blood mononuclear cells [PBMCs]). Rectal and vaginal tissue samples were also collected in a subset of participants. Safety and tolerability were evaluated throughout. RESULTS The pharmacokinetics of islatravir were approximately dose proportional, with concentrations approaching a steady state between days 14 and 21 in plasma and by day 28 for ISL-TP in PBMCs. Plasma exposure accumulation was 1.5-fold to 1.8-fold, and ISL-TP exposure accumulation was ∼10-fold. The apparent terminal half-life of ISL-TP was 177-209 hours. The ISL-TP pharmacokinetic trough threshold-the minimal concentration required for efficacy-of 0.05 pmol/106 cells was achieved after a single administration at all dose levels. Rectal and vaginal tissue also exhibited potentially therapeutic concentrations. Islatravir was generally well tolerated at all doses. CONCLUSIONS ISL-TP levels in PBMCs were above the threshold projected for antiviral efficacy against wild-type HIV after a single 0.25-mg dose. Multiple once-daily dosing of islatravir in adults without HIV was generally well tolerated up to doses of 5 mg administered for up to 6 weeks.
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6
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Rudd DJ, Zhang S, Fillgrove KL, Fox-Bosetti S, Matthews RP, Friedman E, Armas D, Stoch SA, Iwamoto M. Lack of a Clinically Meaningful Drug Interaction Between the HIV-1 Antiretroviral Agents Islatravir, Dolutegravir, and Tenofovir Disoproxil Fumarate. Clin Pharmacol Drug Dev 2021; 10:1432-1441. [PMID: 34676683 PMCID: PMC9298070 DOI: 10.1002/cpdd.1026] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2020] [Accepted: 08/30/2021] [Indexed: 12/28/2022]
Abstract
Islatravir, an investigational nucleoside reverse transcriptase translocation inhibitor, is in clinical development for the treatment and prevention of HIV‐1 infection. Because islatravir may be coadministered with other antiretroviral agents, assessment of potential drug‐drug interactions are warranted. This phase 1, open‐label, fixed‐sequence, 2‐period trial in adults without HIV (N = 12) assessed the safety and pharmacokinetic interactions of islatravir administered with dolutegravir and tenofovir disoproxil fumarate (TDF). In period 1, participants received a single oral dose of islatravir (20 mg). In period 2, participants received oral doses of dolutegravir (50 mg) and TDF (300 mg) once daily on days 1 through 11, with a single oral dose of islatravir (20 mg) coadministered on day 8. There were no clinically significant changes in islatravir, dolutegravir, or TDF pharmacokinetics following coadministration. Islatravir was generally well tolerated when administered alone or in combination with dolutegravir and TDF. Coadministration of islatravir, dolutegravir, and TDF is supported, with no clinically meaningful effect on pharmacokinetics, safety, or tolerability in participants without HIV.
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7
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Bleasby K, Houle R, Hafey M, Lin M, Guo J, Lu B, Sanchez RI, Fillgrove KL. Islatravir Is Not Expected to Be a Victim or Perpetrator of Drug-Drug Interactions via Major Drug-Metabolizing Enzymes or Transporters. Viruses 2021; 13:1566. [PMID: 34452431 PMCID: PMC8402619 DOI: 10.3390/v13081566] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2021] [Revised: 07/16/2021] [Accepted: 07/23/2021] [Indexed: 12/11/2022] Open
Abstract
Islatravir (MK-8591) is a nucleoside reverse transcriptase translocation inhibitor in development for the treatment and prevention of HIV-1. The potential for islatravir to interact with commonly co-prescribed medications was studied in vitro. Elimination of islatravir is expected to be balanced between adenosine deaminase-mediated metabolism and renal excretion. Islatravir did not inhibit uridine diphosphate glucuronosyltransferase 1A1 or cytochrome p450 (CYP) enzymes CYP1A2, 2B6, 2C8, 2C9, 2C19, 2D6, or 3A4, nor did it induce CYP1A2, 2B6, or 3A4. Islatravir did not inhibit hepatic transporters organic anion transporting polypeptide (OATP) 1B1, OATP1B3, organic cation transporter (OCT) 1, bile salt export pump (BSEP), multidrug resistance-associated protein (MRP) 2, MRP3, or MRP4. Islatravir was neither a substrate nor a significant inhibitor of renal transporters organic anion transporter (OAT) 1, OAT3, OCT2, multidrug and toxin extrusion protein (MATE) 1, or MATE2K. Islatravir did not significantly inhibit P-glycoprotein and breast cancer resistance protein (BCRP); however, it was a substrate of BCRP, which is not expected to be of clinical significance. These findings suggest islatravir is unlikely to be the victim or perpetrator of drug-drug interactions with commonly co-prescribed medications, including statins, diuretics, anti-diabetic drugs, proton pump inhibitors, anticoagulants, benzodiazepines, and selective serotonin reuptake inhibitors.
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Affiliation(s)
| | | | | | | | | | | | | | - Kerry L. Fillgrove
- Merck & Co., Inc., Kenilworth, NJ 07033, USA; (K.B.); (R.H.); (M.H.); (M.L.); (J.G.); (B.L.); (R.I.S.)
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8
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Matthews RP, Jackson Rudd D, Fillgrove KL, Zhang S, Tomek C, Stoch SA, Iwamoto M. A Phase 1 Study to Evaluate the Drug Interaction Between Islatravir (MK-8591) and Doravirine in Adults Without HIV. Clin Drug Investig 2021; 41:629-638. [PMID: 34151413 PMCID: PMC8245385 DOI: 10.1007/s40261-021-01046-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/26/2021] [Indexed: 12/13/2022]
Abstract
BACKGROUND AND OBJECTIVES Islatravir (MK-8591) is a novel nucleoside analogue in development for the treatment and prevention of HIV-1 infection. Doravirine is a non-nucleoside reverse transcriptase inhibitor indicated for the treatment of HIV-1 infection. This study evaluated the pharmacokinetics, safety, and tolerability of islatravir and doravirine coadministration in a double-blind, placebo-controlled, randomized, fixed-sequence study. METHODS Adult participants without HIV infection were administered oral doravirine 100 mg (n = 10) or placebo (n = 4) once daily (QD) for 5 days, immediately followed by oral islatravir 2.25 mg (n = 10) or placebo QD (n = 4) for 14 days; islatravir 2.25 mg and doravirine 100 mg QD, or placebo QD, were then coadministered for 5 days. Pharmacokinetic and safety data were collected. RESULTS Doravirine geometric least-squares mean ratios (90% confidence intervals (CIs)) of (doravirine + islatravir)/doravirine for the area under the plasma drug concentration-time curve over 24 h (AUC0-24h), maximum plasma concentration (Cmax), and plasma concentration at 24 h post-dose (C24h) were not meaningfully impacted. Islatravir geometric least-squares mean ratios (90% CI) of (islatravir + doravirine)/islatravir for AUC0-24h and Cmax were both close to unity, 1.06 (1.01, 1.12) and 1.08 (0.91, 1.27), respectively. All study regimens were generally well tolerated. CONCLUSION These results indicate that coadministration of islatravir and doravirine had no clinically meaningful effect on the pharmacokinetics of either drug, and support further clinical investigation of islatravir in combination with doravirine for the treatment of HIV-1 infection.
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9
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Yee KL, Cabalu TD, Kuo Y, Fillgrove KL, Liu Y, Triantafyllou I, McClain S, Dreyer D, Wenning L, Stoch SA, Iwamoto M, Sanchez RI, Khalilieh SG. Physiologically Based Pharmacokinetic Modeling of Doravirine and Its Major Metabolite to Support Dose Adjustment With Rifabutin. J Clin Pharmacol 2020; 61:394-405. [PMID: 32989795 DOI: 10.1002/jcph.1747] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2020] [Accepted: 08/30/2020] [Indexed: 11/09/2022]
Abstract
Doravirine, a novel nonnucleoside reverse transcriptase inhibitor for the treatment of human immunodeficiency virus 1 (HIV-1), is predominantly cleared by cytochrome P450 (CYP) 3A4 and metabolized to an oxidative metabolite (M9). Coadministration with rifabutin, a moderate CYP3A4 inducer, decreased doravirine exposure. Based on nonparametric superposition modeling, a doravirine dose adjustment from 100 mg once daily to 100 mg twice daily during rifabutin coadministration was proposed. However, M9 exposure may also be impacted by induction, in addition to the dose adjustment. As M9 concentrations have not been quantified in previous clinical studies, a physiologically based pharmacokinetic model was developed to investigate the change in M9 exposure when doravirine is coadministered with CYP3A inducers. Simulations demonstrated that although CYP3A induction increases doravirine clearance by up to 4.4-fold, M9 exposure is increased by only 1.2-fold relative to exposures for doravirine 100 mg once daily in the absence of CYP3A induction. Thus, a 2.4-fold increase in M9 exposure relative to the clinical dose of doravirine is anticipated when doravirine 100 mg twice daily is coadministered with rifabutin. In a subsequent clinical trial, doravirine and M9 exposures, when doravirine 100 mg twice daily was coadministered with rifabutin, were found to be consistent with model predictions using rifampin and efavirenz as representative inducers. These findings support the dose adjustment to doravirine 100 mg twice daily when coadministered with rifabutin.
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Affiliation(s)
- Ka Lai Yee
- Merck & Co., Inc., Kenilworth, New Jersey, USA
| | | | - Yuhsin Kuo
- Merck & Co., Inc., Kenilworth, New Jersey, USA
| | | | - Yang Liu
- Merck & Co., Inc., Kenilworth, New Jersey, USA
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10
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Sanchez RI, Fillgrove KL, Yee KL, Liang Y, Lu B, Tatavarti A, Liu R, Anderson MS, Behm MO, Fan L, Li Y, Butterton JR, Iwamoto M, Khalilieh SG. Characterisation of the absorption, distribution, metabolism, excretion and mass balance of doravirine, a non-nucleoside reverse transcriptase inhibitor in humans. Xenobiotica 2018; 49:422-432. [PMID: 29557716 DOI: 10.1080/00498254.2018.1451667] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
Absorption, distribution, metabolism and elimination of doravirine (MK-1439), a novel non-nucleoside reverse transcriptase inhibitor, were investigated. Two clinical trials were conducted in healthy subjects: an oral single dose [14 C]doravirine (350 mg, ∼200 µCi) trial (n = 6) and an intravenous (IV) single-dose doravirine (100 µg) trial (n = 12). In vitro metabolism, protein binding, apparent permeability and P-glycoprotein (P-gp) transport studies were conducted to complement the clinical trials. Following oral [14 C]doravirine administration, all of the administered dose was recovered. The absorbed dose was eliminated primarily via metabolism. An oxidative metabolite (M9) was the predominant metabolite in excreta and was the primary circulating metabolite (12.9% of circulating radioactivity). Following IV administration, doravirine clearance and volume of distribution were 3.73 L/h (95% confidence intervals (CI) 3.09, 4.49) and 60.5 L (95% CI 53.7, 68.4), respectively. In vitro, doravirine is not highly bound to plasma proteins (unbound fraction 0.24) and has good passive permeability. The metabolite M9 was generated by cytochrome P450 3A (CYP3A)4/5-mediated oxidation. Doravirine was a P-gp substrate but P-gp efflux is not expected to play a significant role in limiting doravirine absorption or to be involved in the elimination of doravirine. In conclusion, doravirine is a low clearance drug, primarily eliminated by CYP3A-mediated metabolism.
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Affiliation(s)
| | | | - Ka Lai Yee
- a Merck & Co., Inc ., Kenilworth , NJ , USA
| | | | - Bing Lu
- a Merck & Co., Inc ., Kenilworth , NJ , USA
| | | | | | | | | | - Li Fan
- a Merck & Co., Inc ., Kenilworth , NJ , USA
| | - Yun Li
- a Merck & Co., Inc ., Kenilworth , NJ , USA
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11
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Pero JE, Rossi MA, Kelly MJ, Lehman HGF, Layton ME, Garbaccio RM, O’Brien JA, Magliaro BC, Uslaner J, Huszar SL, Fillgrove KL, Tang C, Kuo Y, Joyce LA, Sherer E, Jacobson MA. Optimization of Novel Aza-benzimidazolone mGluR2 PAMs with Respect to LLE and PK Properties and Mitigation of CYP TDI. ACS Med Chem Lett 2016; 7:312-7. [PMID: 26985321 PMCID: PMC4789683 DOI: 10.1021/acsmedchemlett.5b00459] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2015] [Accepted: 01/09/2016] [Indexed: 01/01/2023] Open
Abstract
Investigation of a novel amino-aza-benzimidazolone structural class of positive allosteric modulators (PAMs) of metabotropic glutamate receptor 2 (mGluR2) identified [2.2.2]-bicyclic amine 12 as an intriguing lead structure due to its promising physicochemical properties and lipophilic ligand efficiency (LLE). Further optimization led to chiral amide 18, which exhibited strong in vitro activity and attractive pharmacokinetic (PK) properties. Hypothesis-driven target design identified compound 21 as a potent, highly selective, orally bioavailable mGluR2 PAM, which addressed a CYP time-dependent inhibition (TDI) liability of 18, while maintaining excellent drug-like properties with robust in vivo activity in a clinically validated model of antipsychotic potential.
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Affiliation(s)
- Joseph E. Pero
- Departments
of Medicinal Chemistry, In Vitro Sciences, Psychiatry Research, Central Pharmacology, Drug Metabolism, Process and Analytical
Chemistry, and Structural Chemistry, Merck Research Laboratories, P.O. Box 4, Sumneytown Pike, West Point, Pennsylvania 19486, United States
| | - Michael A. Rossi
- Departments
of Medicinal Chemistry, In Vitro Sciences, Psychiatry Research, Central Pharmacology, Drug Metabolism, Process and Analytical
Chemistry, and Structural Chemistry, Merck Research Laboratories, P.O. Box 4, Sumneytown Pike, West Point, Pennsylvania 19486, United States
| | - Michael J. Kelly
- Departments
of Medicinal Chemistry, In Vitro Sciences, Psychiatry Research, Central Pharmacology, Drug Metabolism, Process and Analytical
Chemistry, and Structural Chemistry, Merck Research Laboratories, P.O. Box 4, Sumneytown Pike, West Point, Pennsylvania 19486, United States
| | - Hannah
D. G. F. Lehman
- Departments
of Medicinal Chemistry, In Vitro Sciences, Psychiatry Research, Central Pharmacology, Drug Metabolism, Process and Analytical
Chemistry, and Structural Chemistry, Merck Research Laboratories, P.O. Box 4, Sumneytown Pike, West Point, Pennsylvania 19486, United States
| | - Mark E. Layton
- Departments
of Medicinal Chemistry, In Vitro Sciences, Psychiatry Research, Central Pharmacology, Drug Metabolism, Process and Analytical
Chemistry, and Structural Chemistry, Merck Research Laboratories, P.O. Box 4, Sumneytown Pike, West Point, Pennsylvania 19486, United States
| | - Robert M. Garbaccio
- Departments
of Medicinal Chemistry, In Vitro Sciences, Psychiatry Research, Central Pharmacology, Drug Metabolism, Process and Analytical
Chemistry, and Structural Chemistry, Merck Research Laboratories, P.O. Box 4, Sumneytown Pike, West Point, Pennsylvania 19486, United States
| | - Julie A. O’Brien
- Departments
of Medicinal Chemistry, In Vitro Sciences, Psychiatry Research, Central Pharmacology, Drug Metabolism, Process and Analytical
Chemistry, and Structural Chemistry, Merck Research Laboratories, P.O. Box 4, Sumneytown Pike, West Point, Pennsylvania 19486, United States
| | - Brian C. Magliaro
- Departments
of Medicinal Chemistry, In Vitro Sciences, Psychiatry Research, Central Pharmacology, Drug Metabolism, Process and Analytical
Chemistry, and Structural Chemistry, Merck Research Laboratories, P.O. Box 4, Sumneytown Pike, West Point, Pennsylvania 19486, United States
| | - Jason
M. Uslaner
- Departments
of Medicinal Chemistry, In Vitro Sciences, Psychiatry Research, Central Pharmacology, Drug Metabolism, Process and Analytical
Chemistry, and Structural Chemistry, Merck Research Laboratories, P.O. Box 4, Sumneytown Pike, West Point, Pennsylvania 19486, United States
| | - Sarah L. Huszar
- Departments
of Medicinal Chemistry, In Vitro Sciences, Psychiatry Research, Central Pharmacology, Drug Metabolism, Process and Analytical
Chemistry, and Structural Chemistry, Merck Research Laboratories, P.O. Box 4, Sumneytown Pike, West Point, Pennsylvania 19486, United States
| | - Kerry L. Fillgrove
- Departments
of Medicinal Chemistry, In Vitro Sciences, Psychiatry Research, Central Pharmacology, Drug Metabolism, Process and Analytical
Chemistry, and Structural Chemistry, Merck Research Laboratories, P.O. Box 4, Sumneytown Pike, West Point, Pennsylvania 19486, United States
| | - Cuyue Tang
- Departments
of Medicinal Chemistry, In Vitro Sciences, Psychiatry Research, Central Pharmacology, Drug Metabolism, Process and Analytical
Chemistry, and Structural Chemistry, Merck Research Laboratories, P.O. Box 4, Sumneytown Pike, West Point, Pennsylvania 19486, United States
| | - Yuhsin Kuo
- Departments
of Medicinal Chemistry, In Vitro Sciences, Psychiatry Research, Central Pharmacology, Drug Metabolism, Process and Analytical
Chemistry, and Structural Chemistry, Merck Research Laboratories, P.O. Box 4, Sumneytown Pike, West Point, Pennsylvania 19486, United States
| | - Leo A. Joyce
- Departments
of Medicinal Chemistry, In Vitro Sciences, Psychiatry Research, Central Pharmacology, Drug Metabolism, Process and Analytical
Chemistry, and Structural Chemistry, Merck Research Laboratories, P.O. Box 4, Sumneytown Pike, West Point, Pennsylvania 19486, United States
| | - Edward
C. Sherer
- Departments
of Medicinal Chemistry, In Vitro Sciences, Psychiatry Research, Central Pharmacology, Drug Metabolism, Process and Analytical
Chemistry, and Structural Chemistry, Merck Research Laboratories, P.O. Box 4, Sumneytown Pike, West Point, Pennsylvania 19486, United States
| | - Marlene A. Jacobson
- Departments
of Medicinal Chemistry, In Vitro Sciences, Psychiatry Research, Central Pharmacology, Drug Metabolism, Process and Analytical
Chemistry, and Structural Chemistry, Merck Research Laboratories, P.O. Box 4, Sumneytown Pike, West Point, Pennsylvania 19486, United States
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12
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Layton ME, Reif AJ, Hartingh TJ, Rodzinak K, Dudkin V, Wang C, Arrington K, Kelly MJ, Garbaccio RM, O’Brien JA, Magliaro BC, Uslaner JM, Huszar SL, Fillgrove KL, Tang C, Kuo Y, Jacobson MA. Discovery of 5-aryl-1,3-dihydro-2H-imidazo[4,5-b]pyridin-2-ones as positive allosteric modulators of metabotropic glutamate subtype-2 (mGlu2) receptors with efficacy in a preclinical model of psychosis. Bioorg Med Chem Lett 2016; 26:1260-4. [DOI: 10.1016/j.bmcl.2016.01.021] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2015] [Revised: 01/07/2016] [Accepted: 01/08/2016] [Indexed: 10/22/2022]
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13
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Garbaccio RM, Brnardic EJ, Fraley ME, Hartman GD, Hutson PH, O'Brien JA, Magliaro BC, Uslaner JM, Huszar SL, Fillgrove KL, Small JH, Tang C, Kuo Y, Jacobson MA. Discovery of Oxazolobenzimidazoles as Positive Allosteric Modulators for the mGluR2 Receptor. ACS Med Chem Lett 2010; 1:406-10. [PMID: 24900224 DOI: 10.1021/ml100115a] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2010] [Accepted: 06/30/2010] [Indexed: 11/29/2022] Open
Abstract
Novel oxazolobenzimidazoles are described as potent and selective positive allosteric modulators of the metabotropic glutamate receptor 2. The discovery of this class and optimization of its physical and pharmacokinetic properties led to the identification of potent and orally bioavailable compounds (20 and 21) as advanced leads. Compound 20 (TBPCOB) was shown to have robust activity in a PCP-induced hyperlocomotion model in rat, an assay responsive to clinical antipsychotic treatments for schizophrenia.
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14
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Brnardic EJ, Fraley ME, Garbaccio RM, Layton ME, Sanders JM, Culberson C, Jacobson MA, Magliaro BC, Hutson PH, O’Brien JA, Huszar SL, Uslaner JM, Fillgrove KL, Tang C, Kuo Y, Sur SM, Hartman GD. 3-Aryl-5-phenoxymethyl-1,3-oxazolidin-2-ones as positive allosteric modulators of mGluR2 for the treatment of schizophrenia: Hit-to-lead efforts. Bioorg Med Chem Lett 2010; 20:3129-33. [DOI: 10.1016/j.bmcl.2010.03.089] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2010] [Revised: 03/22/2010] [Accepted: 03/26/2010] [Indexed: 10/19/2022]
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15
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Tiller PR, Yu S, Castro-Perez J, Fillgrove KL, Baillie TA. High-throughput, accurate mass liquid chromatography/tandem mass spectrometry on a quadrupole time-of-flight system as a 'first-line' approach for metabolite identification studies. Rapid Commun Mass Spectrom 2008; 22:1053-1061. [PMID: 18327855 DOI: 10.1002/rcm.3472] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Throughput for drug metabolite identification studies has been increased significantly by the combined use of accurate mass liquid chromatography/tandem mass spectrometry (LC/MS/MS) data on a quadrupole time-of-flight (QTOF) system and targeted data analysis procedures. Employed in concert, these tools have led to the implementation of a semi-automated high-throughput metabolite identification strategy that has been incorporated successfully into lead optimization efforts in drug discovery. The availability of elemental composition data on precursor and all fragment ions in each spectrum has greatly enhanced confidence in ion structure assignments, while computer-based algorithms for defining sites of biotransformation based upon mass shifts of diagnostic fragment ions have facilitated identification of positions of metabolic transformation in drug candidates. Adoption of this technology as the 'first-line' approach for in vitro metabolite profiling has resulted in the analysis of as many as 21 new chemical entities on one day from diverse structural classes and therapeutic programs.
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Affiliation(s)
- Philip R Tiller
- Drug Metabolism and Pharmacokinetics, Merck Research Laboratories, West Point, PA 19486, USA.
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16
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Fillgrove KL, Pakhomova S, Schaab MR, Newcomer ME, Armstrong RN. Structure and mechanism of the genomically encoded fosfomycin resistance protein, FosX, from Listeria monocytogenes. Biochemistry 2007; 46:8110-20. [PMID: 17567049 DOI: 10.1021/bi700625p] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The fosfomycin resistance protein, FosX, catalyzes the hydration of the antibiotic fosfomycin, (1R,2S)-epoxypropylphosphonic acid. Genes encoding the enzyme are found in several pathogenic microorganisms. The structure and mechanism of action of the genomically encoded FosX enzyme from Listeria monocytogenes (FosXLMATCC) obtained from the American Type Culture Collection are reported. The gene harbors 31 point mutations, and as a consequence, the protein differs in 10 amino acid residues from the previously reported FosX encoded in the genome of the EGD strain of L. monocytogenes (FosXLMEGD). The FosXLMATCC enzyme is shown to catalyze the addition of water to the C1 position of the antibiotic with inversion of configuration at C1. The reaction involves Mn(II) activation of the oxirane oxygen and E44 acting as a general base. The structure of the enzyme has been determined from six different crystal forms of the protein. The structures of the enzyme without metal bound are similar but differ in the loop regions. Perhaps the most informative structure is the one with the product bound. This structure shows that the phosphonate group of the product is bound in an orientation that is different than that of fosfomycin bound to the related enzyme, FosA. The implication is that the substrate may also be bound in a different orientation in FosX. A high-resolution structure (1.44 A resolution) of the enzyme reveals a unique conformation in which the C-terminal tail of the protein coordinates to the Mn(II) center via the carboxylate of E126. The kinetic characterization of the E126Q mutant indicates that this conformation of the protein is probably not relevant to the function of the enzyme. Kinetic analysis of mutants of active site residue E44 is consistent with its proposed roll as a general base catalyst in the addition of water to the antibiotic.
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Affiliation(s)
- Kerry L Fillgrove
- Department of Biochemistry, Center in Molecular Toxicology and Vanderbilt Institute of Chemical Biology, Vanderbilt University, Nashville, Tennessee 37232-0146, USA
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17
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Rigsby RE, Fillgrove KL, Beihoffer LA, Armstrong RN. Fosfomycin resistance proteins: a nexus of glutathione transferases and epoxide hydrolases in a metalloenzyme superfamily. Methods Enzymol 2006; 401:367-79. [PMID: 16399398 DOI: 10.1016/s0076-6879(05)01023-2] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Three similar but mechanistically distinct fosfomycin resistance proteins that catalyze the opening of the oxirane ring of the antibiotic are known. FosA is a Mn(II) and K(+)-dependent glutathione transferase. FosB is a Mg(2+)-dependent L-cysteine thiol transferase. FosX is a Mn(II)-dependent fosfomycin-specific epoxide hydrolase. The expression, purification, kinetic, and physical characteristics of six fosfomycin resistance proteins including the FosA proteins from transposon TN2921 and Pseudomonas aeruginosa, the FosB proteins from Bacillus subtilis and Staphylococcus aureus, and the FosX proteins from Mesorhizobium loti and Listeria monocytogenes are reported.
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Affiliation(s)
- Rachel E Rigsby
- Department of Biochemistry, Vanderbilt University, Nashville, Tennessee, USA
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18
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Rigsby RE, Rife CL, Fillgrove KL, Newcomer ME, Armstrong RN. Phosphonoformate: a minimal transition state analogue inhibitor of the fosfomycin resistance protein, FosA. Biochemistry 2004; 43:13666-73. [PMID: 15504029 DOI: 10.1021/bi048767h] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Fosfomycin [(1R,2S)-epoxypropylphosphonic acid] is a simple phosphonate found to have antibacterial activity against both Gram-positive and Gram-negative microorganisms. Early resistance to the clinical use of the antibiotic was linked to a plasmid-encoded resistance protein, FosA, that catalyzes the addition of glutathione to the oxirane ring, rendering the antibiotic inactive. Subsequent studies led to the discovery of a genomically encoded homologue in the pathogen Pseudomonas aeruginosa. The proteins are Mn(II)-dependent enzymes where the metal is proposed to act as a Lewis acid stabilizing the negative charge that develops on the oxirane oxygen in the transition state. Several simple phosphonates, including the antiviral compound phosphonoformate (K(i) = 0.4 +/- 0.1 microM, K(d) approximately 0.2 microM), are shown to be inhibitors of FosA. The crystal structure of FosA from P. aeruginosa with phosphonoformate bound in the active site has been determined at 0.95 A resolution and reveals that the inhibitor forms a five-coordinate complex with the Mn(II) center with a geometry similar to that proposed for the transition state of the reaction. Binding studies show that phosphonoformate has a near-diffusion-controlled on rate (k(on) approximately 10(7)-10(8) M(-1) s(-1)) and an off rate (k(off) = 5 s(-1)) that is slower than that for fosfomycin (k(off) = 30 s(-1)). Taken together, these data suggest that the FosA-catalyzed reaction has a very early transition state and phosphonoformate acts as a minimal transition state analogue inhibitor.
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Affiliation(s)
- Rachel E Rigsby
- Department of Chemistry, Center in Molecular Toxicology, Vanderbilt University School of Medicine, Nashville, Tennessee 37232-0146, USA
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19
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Abstract
Microbial resistance to the antibiotic fosfomycin [(1R,2S)-epoxypropylphosphonic acid, 1] is known to be mediated by thiol transferase enzymes FosA and FosB, which catalyze the addition of glutathione and l-cysteine to C1 of the oxirane, respectively. A probe of the microbial genome database reveals a related group of enzymes (FosX). The genes mlr3345 from Mesorhizobium loti and lmo1702 from Listeria monocytogenes were cloned and the proteins expressed. This heretofore unrecognized group of enzymes is shown to catalyze the Mn(II)-dependent addition of water to C1 of the oxirane. The ability of each enzyme to confer resistance in Escherichia coli is correlated with their catalytic efficiency, such that the M. loti protein confers low resistance while the Listeria enzyme confers very robust resistance. The crystal structure of the FosX from M. loti was solved at a resolution of 1.83 A. The structure reveals an active-site carboxylate (E44) located about 5 A from the expected position of the substrate that appears to be poised to participate in catalysis. Single turnover experiments in H218O and kinetic analysis of the E44G mutant of the FosX enzymes indicate that the carboxylate of E44 acts as a general base in the direct addition of water to 1. The FosX from M. loti also catalyzes the addition of glutathione to the antibiotic. The catalytic promiscuity and low efficiency of the M. loti protein suggest that it may be an intermediate in the evolution of clinically relevant fosfomycin resistance proteins such as the FosX from Listeria monocytogenese.
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Affiliation(s)
- Kerry L Fillgrove
- Departments of Biochemistry and Chemistry, Vanderbilt University, Nashville, Tennessee 37232-0146, USA
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20
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Liu B, Wang Y, Fillgrove KL, Anderson VE. Triclosan inhibits enoyl-reductase of type I fatty acid synthase in vitro and is cytotoxic to MCF-7 and SKBr-3 breast cancer cells. Cancer Chemother Pharmacol 2002; 49:187-93. [PMID: 11935210 DOI: 10.1007/s00280-001-0399-x] [Citation(s) in RCA: 86] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2001] [Accepted: 10/11/2001] [Indexed: 11/27/2022]
Abstract
BACKGROUND AND PURPOSE Human type I fatty acid synthase has been proposed as a chemotherapeutic target for the treatment of breast cancer based on the inactivation of human beta-ketoacyl synthase activity by cerulenin. Triclosan, a common antibiotic, functions by inhibiting the enoyl-reductase enzymes of type II fatty acid synthases in susceptible bacteria. If triclosan is an inhibitor of human fatty acid synthase and if inhibition of fatty acid synthase is toxic to breast cancer cell lines, triclosan could prove to be a lead compound for the treatment of breast cancer. Consequently, the inhibitory activity of triclosan against vertebrate type I fatty acid synthases and its effects on breast cancer lines in cell culture were investigated. METHODS The inhibitory activities of triclosan against human and goose fatty acid synthases and each of the partial reactions were investigated using spectrophotometric assays. The ability of triclosan at various concentrations to inhibit growth and reduce the viability of MCF-7 and SKBr-3 cells in culture was evaluated. RESULTS Kinetic studies showed triclosan to be a slow binding inhibitor of human and goose type I fatty acid synthase and to inhibit the partial activity of enoyl-reductase with IC(50) values between 10 and 50 microM. Triclosan at similar concentrations was also shown to inhibit both viability and growth of MCF-7 and SKBr-3 cells in culture. CONCLUSIONS The results corroborate the hypothesis that fatty acid synthase may be a target of breast cancer chemotherapy and suggest that inhibitors of the enoyl-reductase partial activity of fatty acid synthase may have chemotherapeutic potential.
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Affiliation(s)
- Binqiu Liu
- Department of Biochemistry, Case Western Reserve University, 10900 Euclid Ave., Cleveland, OH 44106-4935, USA
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Fillgrove KL, Anderson VE. The mechanism of dienoyl-CoA reduction by 2,4-dienoyl-CoA reductase is stepwise: observation of a dienolate intermediate. Biochemistry 2001; 40:12412-21. [PMID: 11591162 DOI: 10.1021/bi0111606] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The chemical mechanism of the 2,4-dienoyl-CoA reductase (EC 1.3.1.34) from rat liver mitochondria has been investigated. This enzyme catalyzes the NADPH-dependent reduction of 2,4-dienoyl-coenzyme A (CoA) thiolesters to the resulting trans-3-enoyl-CoA. Steady-state kinetic parameters for trans-2,trans-4-hexadienoyl-CoA and 5-phenyl-trans-2,trans-4-pentadienoyl-CoA were determined and demonstrated that the dienoyl-CoA and NADPH bind to the 2,4-dienoyl-CoA reductase via a sequential kinetic mechanism. Kinetic isotope effect studies and the transient kinetics of substrate binding support a random order of nucleotide and dienoyl-CoA addition. The large normal solvent isotope effects on V/K ((D)(2)(O)V/K) and V ((D)(2)(O)V) for trans-2,trans-4-hexadienoyl-CoA reduction indicate that a proton transfer step is rate limiting for this substrate. The stability gained by conjugating the phenyl ring to the diene in PPD-CoA results in the reversal of the rate-determining step, as evidenced by the normal isotope effects on V/K(CoA) ((D)V/K(CoA)) and V/K(NADPH) ((D)V/K(NADPH)). The reversal of the rate-determining step was supported by transient kinetics where a burst was observed for the reduction of trans-2,trans-4-hexadienoyl-CoA but not for 5-phenyl-trans-2,trans-4-pentadienoyl-CoA reduction. The chemical mechanism is stepwise where hydride transfer from NADPH occurs followed by protonation of the observable dienolate intermediate, which has an absorbance maximum at 286 nm. The exchange of the C alpha protons of trans-3-decenoyl-CoA, catalyzed by the 2,4-dienoyl-CoA reductase, in the presence of NADP(+) suggests that formation of the dienolate is catalyzed by the enzyme active site.
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Affiliation(s)
- K L Fillgrove
- Department of Biochemistry, Case Western Reserve University, Cleveland, Ohio 44106-4935, USA
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Fillgrove KL, Anderson VE. Orientation of coenzyme A substrates, nicotinamide and active site functional groups in (Di)enoyl-coenzyme A reductases. Biochemistry 2000; 39:7001-11. [PMID: 10841782 DOI: 10.1021/bi0000566] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The stereochemical course of reduction of dienoyl-coenzyme A (CoA) thiolesters catalyzed by the 2,4-dienoyl-CoA reductase from rat liver mitochondria was investigated. The configuration of the double bond in the 3-enoyl-CoA products was determined by (1)H NMR, and experiments to determine the stereochemical course of reduction at Calpha and Cdelta by use of 4-(2)H-labeled beta-nicotinamide adenine dinucleotide phosphate, reduced form (NADPH), were conducted in H(2)O and D(2)O. Defining the diastereoselectivity of the reaction, catalyzed by the Delta(3),Delta(2)-enoyl-CoA isomerase, facilitated the determination of the stereochemical course of reduction by 2, 4-dienoyl-CoA reductase. The absence of solvent exchange of the proton transferred during the Delta(3),Delta(2)-enoyl-CoA isomerase catalyzed equilibration of trans-2- and trans-3-enoyl-CoAs, coupled with the strong sequence homology to enoyl-CoA hydratase support the intramolecular suprafacial transfer of the pro-2R proton of trans-3-enoyl-CoA to the pro-4R position of trans-2-enoyl-CoA. The results indicate that the configuration of the double bond of the 3-enoyl-CoA product is trans and that a general acid-catalyzed addition of a solvent derived proton/deuteron occurs on the si face at Calpha of the dienoyl-CoA. The addition of the pro-4S hydrogen from NADPH occurs on the si face at Cdelta of trans-2, cis-4-dienoyl-CoA and on the re face at Cdelta of trans-2, trans-4-dienoyl-CoA. The stereochemical course of reduction of InhA, an enoyl-thiolester reductase from Mycobacterium tuberculosis, was also determined by use of ¿4-(2)HNADH in D(2)O. The reduction of trans-2-octenoyl-CoA catalyzed by InhA resulted in the syn addition of (2)H(2) across the double bond yielding (2R,3S)-¿2, 3-(2)H(2)ŏctanoyl-CoA. In the crystal structure of the InhA ternary complex, the residue donating the proton to Calpha could not be identified ¿Rozwarski, D. A., Vilcheze, C., Sugantino, M., Bittman, R., and Sacchettini, J. C. (1999) J. Biol. Chem. 274, 15582-15589. The current results place further restrictions on the source of the proton and suggest the reduction is stepwise.
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Affiliation(s)
- K L Fillgrove
- Department of Biochemistry, Case Western Reserve University, Cleveland, Ohio 44106-4935, USA
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Fillgrove KL, Anderson VE, Mizugaki M. Cloning, expression, and purification of the functional 2,4-dienoyl-CoA reductase from rat liver mitochondria. Protein Expr Purif 1999; 17:57-63. [PMID: 10497069 DOI: 10.1006/prep.1999.1101] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The mitochondrial 2,4-dienoyl-CoA reductase (EC 1.3.1.34) is an auxiliary enzyme for the beta-oxidation of unsaturated fatty acids. Import of this enzyme into the mitochondria requires a mitochondrial signal sequence at the amino terminus of the polypeptide chain which is processed/removed once inside the mitochondria. The cDNA of the full-length 2,4-dienoyl-CoA reductase was previously cloned as pRDR181. PCR methodologies were used to subclone the gene encoding the functional 2,4-dienoyl-CoA reductase from pRDR181. The PCR product was inserted into a pET15b expression vector and overexpressed in Escherichia coli. The soluble expressed protein can be separated into high- and low-activity fractions. The low-activity fraction can be converted to the high specific activity form by thermal annealing, suggesting it is a metastable misfolded form of the enzyme. Using ion-exchange and affinity chromatography, the enzyme has been purified to homogeneity and exhibits a single band on Coomassie blue-stained SDS-PAGE. The molecular mass of 32,413 Da determined by electrospray ionization-mass spectrometry indicates that the amino-terminal methionine had been removed. The Michaelis constants for trans-2, trans-4-hexadienoyl-CoA and NADPH were determined to be 0.46 and 2.5 microM, respectively; a turnover number of 2.1 s(-1) was calculated.
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Affiliation(s)
- K L Fillgrove
- Department of Biochemistry, Case Western Reserve University, Cleveland, Ohio 44106-4935, USA
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