期刊
ACS INFECTIOUS DISEASES
卷 4, 期 3, 页码 337-348出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsinfecdis.7b00153
关键词
beta-lactamase; boronic acid; structure activity relationship; click chemistry; carboxylate; structure activity relationship study; enzyme plasticity; Acinetobacter
资金
- Cleveland Department of Veterans Affairs
- Veterans Affairs Merit Review Program [1I01BX001974]
- Geriatric Research Education and Clinical Center VISN 10
- National Institute of Allergy and Infectious Diseases of the National Institutes of Health [R01AI063517, R01AI100560]
- Harrington Foundation
- Office of Undergraduate Research and Scholarship at GVSU
- McNair Scholars Program at GVSU
Boronic acids are attracting a lot of attention as beta-lactamase inhibitors, and in particular, compound S02030 (K-i = 44 nM) proved to be a good lead compound against ADC-7 (Acinetobacter-derived cephalosporinase), one of the most significant resistance determinants in A. baumannii. The atomic structure of the ADC-7/S02030 complex highlighted the importance of critical structural determinants for recognition of the boronic acids. Herein, to elucidate the role in recognition of the R2-carboxylate, which mimics the C-3/C-4 found in beta-lactams, we designed, synthesized, and characterized six derivatives of S02030 (3a). Out of the six compounds, the best inhibitors proved to be those with an explicit negative charge (compounds 3a-c, 3h, and 3j, K-i = 44-115 nM), which is in contrast to the derivatives where the negative charge is omitted, such as the amide derivative 3d (K-i = 224 nM) and the hydroxyamide derivative 3e (K-i = 155 nM). To develop a structural characterization of inhibitor binding in the active site, the X-ray crystal structures of ADC-7 in a complex with compounds 3c, SM23, and ECO4 were determined. All three compounds share the same structural features as in S02030 but only differ in the carboxy-R2 side chain, thereby providing the opportunity of exploring the distinct binding mode of the negatively charged R2 side chain. This cephalosporinase demonstrates a high degree of versatility in recognition, employing different residues to directly interact with the carboxylate, thus suggesting the existence of a carboxylate binding region rather than a binding site in ADC enzymes. Furthermore, this class of compounds was tested against resistant clinical strains of A. baumannii and are effective at inhibiting bacterial growth in conjunction with a beta-lactam antibiotic.
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