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Title: Expanding Benzoxazole-Based Inosine 5'-Monophosphate Dehydrogenase (IMPDH) Inhibitor Structure–Activity As Potential Antituberculosis Agents

Journal Article · · Journal of Medicinal Chemistry
 [1]; ORCiD logo [2];  [3];  [4];  [1];  [1];  [1];  [5];  [6];  [4]; ORCiD logo [7];  [8]; ORCiD logo [1]
  1. Brandeis Univ., Waltham, MA (United States). Dept. of Biology
  2. National Inst. of Allergy and Infectious Diseases, Bethesda, MD (United States). Tuberculosis Research Section
  3. Univ. of Cape Town, Rondebosch, Cape Town (South Africa). Dept. of Drug Discovery and Development & Inst. of Infectious Disease and Molecular Medicine, H3D Drug Discovery and Development Centre
  4. Univ. del Piemonte Orientale, Novara (Italy). Dipartimento di Scienze del Farmaco
  5. Brandeis Univ., Waltham, MA (United States). Dept. of Chemistry
  6. Univ. of Chicago, IL (United States). Center for Structural Genomics of Infectious Diseases and Dept. of Biochemistry and Molecular Biology
  7. Univ. of Cape Town (South Africa). MRC/NHLS/UCT Molecular Mycobacteriology Research Unit & DST/NRF Centre of Excellence for Biomedical TB Research, Inst. of Infectious Disease and Molecular Medicine & Dept. of Pathology
  8. Univ. of Houston, Houston, TX (United States). Dept. of Pharmacological and Pharmaceutical Sciences, College of Pharmacy

New drugs and molecular targets are urgently needed to address the emergence and spread of drug-resistant tuberculosis. Mycobacterium tuberculosis (Mtb) inosine 5'-monophosphate dehydrogenase 2 (MtbIMPDH2) is a promising yet controversial potential target. The inhibition of MtbIMPDH2 blocks the biosynthesis of guanine nucleotides, but high concentrations of guanine can potentially rescue the bacteria. Here in this paper we describe an expansion of the structure activity relationship (SAR) for the benzoxazole series of MtbIMPDH2 inhibitors and demonstrate that minimum inhibitory concentrations (MIC) of <= 1 mu M can be achieved. The antibacterial activity of the most promising compound, 17b (Q151), is derived from the inhibition of MtbIMPDH2 as demonstrated by conditional knockdown and resistant strains. Importantly, guanine does not change the MIC of 17b, alleviating the concern that guanine salvage can protect Mtb in vivo. These findings suggest that MtbIMPDH2 is a vulnerable target for tuberculosis.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
National Institutes of Health (NIH) - National Institute of Allergy and Infectious Diseases (NIAID); South African Medical research Council (SAMRC); National Research Foundation (NRF) South Africa; U. S. Department of Health and Human Services; National Institutes of Health (NIH); USDOE
Grant/Contract Number:
AC02-06CH11357; HHSN272200700058C; HHSN272201200026C
OSTI ID:
1466338
Journal Information:
Journal of Medicinal Chemistry, Vol. 61, Issue 11; ISSN 0022-2623
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 32 works
Citation information provided by
Web of Science

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Drug-resistance in Mycobacterium tuberculosis : where we stand journal January 2019
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Inhibitors of inosine 5′-monophosphate dehydrogenase as emerging new generation antimicrobial agents journal January 2019