Article (Scientific journals)
VNRX-5133 (Taniborbactam), a broad-spectrum inhibitor of serine- And metallo-β-lactamases, restores activity of cefepime in enterobacterales and Pseudomonas aeruginosa
Hamrick, J. C.; Docquier, Jean-Denis; Uehara, T. et al.
2020In Antimicrobial Agents and Chemotherapy, 64 (3)
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Keywords :
Antibacterial; Biochemistry; Microbiology; Structural biology; Article; Escherichia coli; Pseudomonas aeruginosa
Abstract :
[en] As shifts in the epidemiology of β-lactamase-mediated resistance continue, carbapenem-resistant Enterobacterales (CRE) and carbapenem-resistant Pseudomonas aeruginosa (CRPA) are the most urgent threats. Although approved β-lactam (BL)–β-lactamase inhibitor (BLI) combinations address widespread serine β-lactamases (SBLs), such as CTX-M-15, none provide broad coverage against either clinically important serine-β-lactamases (KPC, OXA-48) or clinically important metalloβ-lactamases (MBLs; e.g., NDM-1). VNRX-5133 (taniborbactam) is a new cyclic boronate BLI that is in clinical development combined with cefepime for the treatment of infections caused by β-lactamase-producing CRE and CRPA. Taniborbactam is the first BLI with direct inhibitory activity against Ambler class A, B, C, and D enzymes. From biochemical and structural analyses, taniborbactam exploits substrate mimicry while employing distinct mechanisms to inhibit both SBLs and MBLs. It is a reversible covalent inhibitor of SBLs with slow dissociation and a prolonged active-site residence time (half-life, 30 to 105 min), while in MBLs, it behaves as a competitive inhibitor, with inhibitor constant (Ki) values ranging from 0.019 to 0.081 μM. Inhibition is achieved by mimicking the transition state structure and exploiting interactions with highly conserved active-site residues. In microbiological testing, taniborbactam restored cefepime activity in 33/34 engineered Escherichia coli strains overproducing individual enzymes covering Ambler classes A, B, C, and D, providing up to a 1,024-fold shift in the MIC. Addition of taniborbactam restored the antibacterial activity of cefepime against all 102 Enterobacterales clinical isolates tested and 38/41 P. aeruginosa clinical isolates tested with MIC90s of 1 and 4 μg/ml, respectively, representing ≤256- and ≤32-fold improvements, respectively, in antibacterial activity over that of cefepime alone. The data demonstrate the potent, broad-spectrum rescue of cefepime activity by taniborbactam against clinical isolates of CRE and CRPA. Copyright © 2020 Hamrick et al.
Disciplines :
Microbiology
Author, co-author :
Hamrick, J. C.;  Venatorx Pharmaceuticals Incorporated, Malvern, PA, United States
Docquier, Jean-Denis ;  Université de Liège - ULiège > Département des sciences de la vie > Centre d'ingénierie des protéines
Uehara, T.;  Venatorx Pharmaceuticals Incorporated, Malvern, PA, United States
Myers, C. L.;  Venatorx Pharmaceuticals Incorporated, Malvern, PA, United States
Six, D. A.;  Venatorx Pharmaceuticals Incorporated, Malvern, PA, United States
Chatwin, C. L.;  Venatorx Pharmaceuticals Incorporated, Malvern, PA, United States
John, K. J.;  Venatorx Pharmaceuticals Incorporated, Malvern, PA, United States
Vernacchio, S. F.;  Venatorx Pharmaceuticals Incorporated, Malvern, PA, United States
Cusick, S. M.;  Venatorx Pharmaceuticals Incorporated, Malvern, PA, United States
Trout, R. E. L.;  Venatorx Pharmaceuticals Incorporated, Malvern, PA, United States
Pozzi, C.;  Department of Biotechnology, Chemistry and Pharmacy, University of Siena, Siena, Italy
De Luca, F.;  Department of Medical Biotechnology, University of Siena, Siena, Italy
Benvenuti, M.;  Department of Biotechnology, Chemistry and Pharmacy, University of Siena, Siena, Italy
Mangani, S.;  Department of Biotechnology, Chemistry and Pharmacy, University of Siena, Siena, Italy
Liu, B.;  Venatorx Pharmaceuticals Incorporated, Malvern, PA, United States
Jackson, R. W.;  Venatorx Pharmaceuticals Incorporated, Malvern, PA, United States
Moeck, G.;  Venatorx Pharmaceuticals Incorporated, Malvern, PA, United States
Xerri, L.;  Venatorx Pharmaceuticals Incorporated, Malvern, PA, United States
Burns, C. J.;  Venatorx Pharmaceuticals Incorporated, Malvern, PA, United States
Pevear, D. C.;  Venatorx Pharmaceuticals Incorporated, Malvern, PA, United States
Daigle, D. M.;  Venatorx Pharmaceuticals Incorporated, Malvern, PA, United States
More authors (11 more) Less
Language :
English
Title :
VNRX-5133 (Taniborbactam), a broad-spectrum inhibitor of serine- And metallo-β-lactamases, restores activity of cefepime in enterobacterales and Pseudomonas aeruginosa
Publication date :
2020
Journal title :
Antimicrobial Agents and Chemotherapy
ISSN :
0066-4804
eISSN :
1098-6596
Publisher :
American Society for Microbiology
Volume :
64
Issue :
3
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
NIAID - National Institute of Allergy and Infectious Diseases [US-MD] [US-MD]
Wellcome Trust [GB]
Available on ORBi :
since 13 November 2020

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