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Singh P, Kumar SK, Maurya VK, Mehta BK, Ahmad H, Dwivedi AK, Chaturvedi V, Thakur TS, Sinha S. S-Enantiomer of the Antitubercular Compound S006-830 Complements Activity of Frontline TB Drugs and Targets Biogenesis of Mycobacterium tuberculosis Cell Envelope. ACS OMEGA 2017; 2:8453-8465. [PMID: 30023583 PMCID: PMC6045410 DOI: 10.1021/acsomega.7b01281] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2017] [Accepted: 10/31/2017] [Indexed: 05/15/2023]
Abstract
A synthetic molecule S006-830, belonging to the class of thiophene-containing trisubstituted methanes, had shown good in vitro and in vivo bactericidal activity against drug-sensitive and drug-resistant Mycobacterium tuberculosis (Mtb). The molecule had also shown good druglike pharmacokinetic properties. However, S006-830 is a racemic mixture of two enantiomers, one of which could possess a better pharmacological profile than the other. We purified both the enantiomers on a chiral column and observed that S-enantiomer has a significantly higher inhibitory and cidal activity against Mtb than the R-enantiomer. Action of S-S006-830 was "synergistic" for rifampicin and "additive" for isoniazid and ethambutol. The combination of S-S006-830 and rifampicin produced 100% kill of Mtb within 8 days. In a chemical proteomics approach using matrix-bound compound to pull down its target protein(s) from Mtb membrane, FabG4 (β-ketoacyl CoA reductase, EC 1.1.1.100) emerged as the most likely target for S-S006-830. In target validation assays, the compound exhibited 2-fold higher inhibitory concentration for an Mtb construct overexpressing FabG4. In addition, it inhibited mycolic acid biosynthesis and formation of biofilms by Mtb. Molecular docking of S-S006-830 with FabG4 was consistent with the experimental data. These results support the development of S-S006-830 as a novel lead against tuberculosis.
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Affiliation(s)
- Padam Singh
- Division
of Biochemistry, Division of Molecular and Structural Biology, and Division of Pharmaceutics, CSIR-Central Drug Research Institute, Sector-10, Jankipuram Extension, Lucknow 226031, India
| | - Shashi Kant Kumar
- Division
of Biochemistry, Division of Molecular and Structural Biology, and Division of Pharmaceutics, CSIR-Central Drug Research Institute, Sector-10, Jankipuram Extension, Lucknow 226031, India
| | - Vineet Kumar Maurya
- Division
of Biochemistry, Division of Molecular and Structural Biology, and Division of Pharmaceutics, CSIR-Central Drug Research Institute, Sector-10, Jankipuram Extension, Lucknow 226031, India
- Department
of Botany and Microbiology, HNB Garhwal
University, Srinagar, Uttarakhand 246174, India
| | - Basant Kumar Mehta
- Division
of Biochemistry, Division of Molecular and Structural Biology, and Division of Pharmaceutics, CSIR-Central Drug Research Institute, Sector-10, Jankipuram Extension, Lucknow 226031, India
| | - Hafsa Ahmad
- Division
of Biochemistry, Division of Molecular and Structural Biology, and Division of Pharmaceutics, CSIR-Central Drug Research Institute, Sector-10, Jankipuram Extension, Lucknow 226031, India
| | - Anil Kumar Dwivedi
- Division
of Biochemistry, Division of Molecular and Structural Biology, and Division of Pharmaceutics, CSIR-Central Drug Research Institute, Sector-10, Jankipuram Extension, Lucknow 226031, India
| | - Vinita Chaturvedi
- Division
of Biochemistry, Division of Molecular and Structural Biology, and Division of Pharmaceutics, CSIR-Central Drug Research Institute, Sector-10, Jankipuram Extension, Lucknow 226031, India
- E-mail: (V.C.)
| | - Tejender S. Thakur
- Division
of Biochemistry, Division of Molecular and Structural Biology, and Division of Pharmaceutics, CSIR-Central Drug Research Institute, Sector-10, Jankipuram Extension, Lucknow 226031, India
- E-mail: (T.S.T.)
| | - Sudhir Sinha
- Division
of Biochemistry, Division of Molecular and Structural Biology, and Division of Pharmaceutics, CSIR-Central Drug Research Institute, Sector-10, Jankipuram Extension, Lucknow 226031, India
- Department
of Clinical Immunology, SGPG Institute of
Medical Sciences, Raebareli Road, Lucknow 226014, India
- E-mail: (S.S.)
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Hidau MK, Kolluru S, Palakurthi S. Development and validation of a high-performance liquid chromatography method for the quantification of talazoparib in rat plasma: Application to plasma protein binding studies. Biomed Chromatogr 2017; 32. [PMID: 28677821 DOI: 10.1002/bmc.4046] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2017] [Revised: 06/26/2017] [Accepted: 06/30/2017] [Indexed: 11/07/2022]
Abstract
A sensitive and selective RP-HPLC method has been developed and validated for the quantification of a highly potent poly ADP ribose polymerase inhibitor talazoparib (TZP) in rat plasma. Chromatographic separation was performed with isocratic elution method. Absorbance for TZP was measured with a UV detector (SPD-20A UV-vis) at a λmax of 227 nm. Protein precipitation was used to extract the drug from plasma samples using methanol-acetonitrile (65:35) as the precipitating solvent. The method proved to be sensitive and reproducible over a 100-2000 ng/mL linearity range with a lower limit of quantification (LLQC) of 100 ng/mL. TZP recovery was found to be >85%. Following analytical method development and validation, it was successfully employed to determine the plasma protein binding of TZP. TZP has a high level of protein binding in rat plasma (95.76 ± 0.38%) as determined by dialysis method.
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Affiliation(s)
- Mahendra Kumar Hidau
- Department of Pharmaceutical Sciences, Irma Lerma Rangel College of Pharmacy, Texas A&M Health Science Center, Kingsville, Texas, USA
| | - Srikanth Kolluru
- Department of Pharmaceutical Sciences, KGI School of Pharmacy, Claremont, California, Texas, USA
| | - Srinath Palakurthi
- Department of Pharmaceutical Sciences, Irma Lerma Rangel College of Pharmacy, Texas A&M Health Science Center, Kingsville, Texas, USA
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Singh P, Saha T, Mishra P, Parai MK, Ireddy S, Lavanya Kumar M S, Krishna S, Kumar SK, Chaturvedi V, Sinha S, Siddiqi MI, Panda G. Additional synthesis on thiophene-containing trisubstituted methanes (TRSMs) as inhibitors of M. tuberculosis and 3D-QSAR studies. SAR AND QSAR IN ENVIRONMENTAL RESEARCH 2016; 27:911-937. [PMID: 27885861 DOI: 10.1080/1062936x.2016.1243575] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2016] [Accepted: 09/28/2016] [Indexed: 05/28/2023]
Abstract
We earlier reported thiophene-containing trisubstituted methanes (TRSMs) as novel cores carrying anti-tubercular activity, and identified S006-830 as the phenotypic lead with potent bactericidal activity against single- and multi-drug resistant clinical isolates of Mycobacterium tuberculosis (M. tb). In this work, we carried out additional synthesis of several TRSMs. The reaction scheme essentially followed the Grignard reaction and Friedel-Crafts alkylation, followed by insertion of a dialkylaminoethyl chain. We also performed microbiological evaluations including in vitro screening against the virulent strain M. tb H37Rv, cytotoxicity assessment in the Vero C-1008 cell line, and 3D-QSAR studies with comparative molecular field analysis (CoMFA) and comparative molecular similarity index analysis (CoMSIA). CoMFA and CoMSIA models yielded good statistical results in terms of q2 and r2 values, suggesting the validity of the models. It was concluded that a para-substituted benzene ring with bulkier electron-donating groups and aminoalkyl chains are required for higher inhibitory capacity against M. tuberculosis. We believe that these insights will rationally guide the design of newer, optimal, TRSMs.
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Affiliation(s)
- P Singh
- a Institut des Biomolécules Max Mousseron , Montpellier , France
- b Medicinal and Process Chemistry Division , CSIR-Central Drug Research Institute , Lucknow , India
| | - T Saha
- b Medicinal and Process Chemistry Division , CSIR-Central Drug Research Institute , Lucknow , India
| | - P Mishra
- b Medicinal and Process Chemistry Division , CSIR-Central Drug Research Institute , Lucknow , India
| | - M K Parai
- b Medicinal and Process Chemistry Division , CSIR-Central Drug Research Institute , Lucknow , India
| | - S Ireddy
- b Medicinal and Process Chemistry Division , CSIR-Central Drug Research Institute , Lucknow , India
| | - S Lavanya Kumar M
- b Medicinal and Process Chemistry Division , CSIR-Central Drug Research Institute , Lucknow , India
| | - S Krishna
- c Molecular and Structural Biology Division , CSIR-Central Drug Research Institute , Lucknow , India
| | - S K Kumar
- d Biochemistry Division , CSIR-Central Drug Research Institute , Lucknow , India
| | - V Chaturvedi
- d Biochemistry Division , CSIR-Central Drug Research Institute , Lucknow , India
| | - S Sinha
- d Biochemistry Division , CSIR-Central Drug Research Institute , Lucknow , India
| | - M I Siddiqi
- c Molecular and Structural Biology Division , CSIR-Central Drug Research Institute , Lucknow , India
| | - G Panda
- b Medicinal and Process Chemistry Division , CSIR-Central Drug Research Institute , Lucknow , India
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