8R5T image
Entry Detail
PDB ID:
8R5T
Title:
Crystal structure of NDM-1 in complex with benzobisheterocycle compound 14.
Biological Source:
Source Organism:
PDB Version:
Deposition Date:
2023-11-17
Release Date:
2024-04-10
Method Details:
Experimental Method:
Resolution:
1.58 Å
R-Value Free:
0.21
R-Value Work:
0.16
R-Value Observed:
0.17
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Metallo-beta-lactamase type 2
Chain IDs:A, B
Chain Length:244
Number of Molecules:2
Biological Source:Klebsiella pneumoniae
Primary Citation
Rational Design of Benzobisheterocycle Metallo-beta-Lactamase Inhibitors: A Tricyclic Scaffold Enhances Potency against Target Enzymes.
J.Med.Chem. 67 3795 3812 (2024)
PMID: 38373290 DOI: 10.1021/acs.jmedchem.3c02209

Abstact

Antimicrobial resistance is a global public health threat. Metallo-β-lactamases (MBLs) inactivate β-lactam antibiotics, including carbapenems, are disseminating among Gram-negative bacteria, and lack clinically useful inhibitors. The evolving bisthiazolidine (BTZ) scaffold inhibits all three MBL subclasses (B1-B3). We report design, synthesis, and evaluation of BTZ analogues. Structure-activity relationships identified the BTZ thiol as essential, while carboxylate is replaceable, with its removal enhancing potency by facilitating hydrophobic interactions within the MBL active site. While the introduction of a flexible aromatic ring is neutral or detrimental for inhibition, a rigid (fused) ring generated nM benzobisheterocycle (BBH) inhibitors that potentiated carbapenems against MBL-producing strains. Crystallography of BBH:MBL complexes identified hydrophobic interactions as the basis of potency toward B1 MBLs. These data underscore BTZs as versatile, potent broad-spectrum MBL inhibitors (with activity extending to enzymes refractory to other inhibitors) and provide a rational approach to further improve the tricyclic BBH scaffold.

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