Molecular analysis of beta-lactamase structure and function

Authors: Majiduddin F.K.¹; Materon I.C.²; Palzkill T.G.^{1, 2}

Source: International Journal of Medical Microbiology, Volume 292, Number 2, July 2002 , pp. 127-137(11)

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Abstract:

The extensive and sometimes irresponsible use of beta-lactam antibiotics in clinical and agricultural settings has contributed to the emergence and widespread dissemination of antibiotic-resistant bacteria. Bacteria have evolved three strategies to escape the activity of beta-lactam antibiotics: 1) alteration of the target site (e.g. penicillin-binding protein (PBPs), 2) reduction of drug permeation across the bacterial membrane (e.g. efflux pumps) and 3) production of beta-lactamase enzymes. The beta-lactamase enzymes inactivate beta-lactam antibiotics by hydrolyzing the peptide bond of the characteristic four-membered beta-lactam ring rendering the antibiotic ineffective. The inactivation of the antibiotic provides resistance to the bacterium. Currently, there are over 300 beta-lactamase enzymes described for which numerous kinetic, structural, computational and mutagenesis studies have been performed. In this review, we discuss the recent work performed on the four different classes (A, B, C, and D) of beta-lactamases. These investigative advances further expand our knowledge about these complex enzymes, and hopefully, will provide us with additional tools to develop new inhibitors and antibiotics based on structural and rational designs.

Keywords: beta-lactamases; beta-lactam antibiotics; antibiotic resistance; structure-function; beta-lactamase inhibitors

Language: English

Document Type: Original article

Affiliations: 1: Department of Biochemistry and Molecular Biology, Baylor College of Medicine, Houston, TX, USA 2: Department of Molecular Virology and Microbiology, Baylor College of Medicine, Houston, TX, USA

Publication date: 2002-07-01