The structural basis for substrate versatility of chloramphenicol acetyltransferase CATI
Open Access
- 31 January 2012
- journal article
- research article
- Published by Wiley in Protein Science
- Vol. 21 (4), 520-530
- https://doi.org/10.1002/pro.2036
Abstract
Novel antibiotics are needed to overcome the challenge of continually evolving bacterial resistance. This has led to a renewed interest in mechanistic studies of once popular antibiotics like chloramphenicol (CAM). Chloramphenicol acetyltransferases (CATs) are enzymes that covalently modify CAM, rendering it inactive against its target, the ribosome, and thereby causing resistance to CAM. Of the three major types of CAT (CATI‐III), the CAM‐specific CATIII has been studied extensively. Much less is known about another clinically important type, CATI. In addition to inactivating CAM and unlike CATIII, CATI confers resistance to a structurally distinct antibiotic, fusidic acid. The origin of the broader substrate specificity of CATI has not been fully elucidated. To understand the substrate binding features of CATI, its crystal structures in the unbound (apo) and CAM‐bound forms were determined. The analysis of these and previously determined CATI‐FA and CATIII‐CAM structures revealed interactions responsible for CATI binding to its substrates and clarified the broader substrate preference of CATI compared to that of CATIII.Keywords
Funding Information
- Life Sciences Institute
- College of Pharmacy (University of Michigan)
- Cellular Biotechnology Training Program (CBTP)
- American Foundation of Pharmaceutical Education (AFPE) Fellowship
- Rackham Merit Fellowship at the University of Michigan
- National Institutes of Health (NIH) (AI090048)
This publication has 65 references indexed in Scilit:
- Revisiting the structures of several antibiotics bound to the bacterial ribosomeProceedings of the National Academy of Sciences of the United States of America, 2010
- Structures of the Escherichia coli ribosome with antibiotics bound near the peptidyl transferase center explain spectra of drug actionProceedings of the National Academy of Sciences of the United States of America, 2010
- Coot: model-building tools for molecular graphicsActa Crystallographica Section D-Biological Crystallography, 2004
- The Protein Data BankNucleic Acids Research, 2000
- Refinement of Macromolecular Structures by the Maximum-Likelihood MethodActa Crystallographica Section D-Biological Crystallography, 1997
- [20] Processing of X-ray diffraction data collected in oscillation modeMethods in Enzymology, 1997
- Identification of Local Carboxy-terminal Hydrophobic Interactions Essential for Folding or Stability of Chloramphenicol AcetyltransferaseJournal of Molecular Biology, 1996
- Refined crystal structure of type III chloramphenicol acetyltransferase at 1·75 Å resolutionJournal of Molecular Biology, 1990
- Substitutions in the active site of chloramphenicol acetyltransferase: role of a conserved aspartateBiochemistry, 1988
- 3-(Bromoacetyl)chloramphenicol, an active site-directed inhibitor for chloramphenicol acetyltransferaseBiochemistry, 1985