6td0

Publication Abstract from PubMed

Klebsiella pneumoniae carbapenemase-2 (KPC-2) is a serine-beta-lactamase (SBL) capable of hydrolysing almost all beta-lactam antibiotics. We compare KPC-2 inhibition by vaborbactam, a clinically-approved monocyclic boronate, and VNRX-5133 (taniborbactam), a bicyclic boronate in late-stage clinical development. Vaborbactam inhibition is slowly reversible, whereas taniborbactam has an off-rate indicating essentially irreversible complex formation and a 15-fold higher on-rate, although both potentiate beta-lactam activity against KPC-2-expressing K. pneumoniae. High resolution X-ray crystal structures reveal closely related binding modes for both inhibitors to KPC-2, with differences apparent only in positioning of the endocyclic boronate ester oxygen. The results indicate the bicyclic boronate scaffold as both an efficient, long-lasting, KPC-2 inhibitor and capable of supporting further iterations that may improve potency against specific enzyme targets and pre-empt the emergence of inhibitor resistant KPC-2 variants.

Cyclic boronates as versatile scaffolds for KPC-2 beta-lactamase inhibition.,Tooke CL, Hinchliffe P, Krajnc A, Mulholland AJ, Brem J, Schofield CJ, Spencer J RSC Med Chem. 2020 Jan 10;11(4):491-496. doi: 10.1039/c9md00557a. eCollection , 2020 Apr 1. PMID:33479650^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.