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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Severinov, Konstantin Agarwal, Vinayak Tikhonov, Anton Nair, Satish K. Metlitskaya, Anastasia |
| Description | Author Affiliation: Agarwal V ( Center for Biophysics and Computational Biology, Institute for Genomic Biology, and Department of Biochemistry, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Urbana, IL 61801, USA.); |
| Abstract | Several classes of naturally occurring antimicrobials exert their antibiotic activity by specifically targeting aminoacyl-tRNA synthetases, validating these enzymes as drug targets. The aspartyl tRNA synthetase 'Trojan horse' inhibitor microcin C7 (McC7) consists of a nonhydrolyzable aspartyl-adenylate conjugated to a hexapeptide carrier that facilitates active import into bacterial cells through an oligopeptide transport system. Subsequent proteolytic processing releases the toxic compound inside the cell. Producing strains of McC7 must protect themselves against autotoxicity that may result from premature processing. The mccF gene confers resistance against endogenous and exogenous McC7 by hydrolyzing the amide bond that connects the peptide and nucleotide moieties of McC7. We present here crystal structures of MccF, in complex with various ligands. The MccF structure is similar to that of dipeptide ld-carboxypeptidase, but with an additional loop proximal to the active site that serves as the primary determinant for recognition of adenylated substrates. Wild-type MccF only hydrolyzes the naturally occurring aspartyl phosphoramidate McC7 and synthetic peptidyl sulfamoyl adenylates that contain anionic side chains. We show that substitutions of two active site MccF residues result in a specificity switch toward aromatic aminoacyl-adenylate substrates. These results suggest how MccF-like enzymes may be used to avert various toxic aminoacyl-adenylates that accumulate during antibiotic biosynthesis or in normal metabolism of the cell. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 12 |
| Volume Number | 109 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 2012-03-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Bacteriocins Chemistry Carboxypeptidases Amides Amino Acyl-tRNA Synthetases Antagonists & Inhibitors Bacteria Drug Effects Catalysis Catalytic Domain Crystallography, X-Ray Hydrolysis Kinetics Models, Molecular Molecular Conformation Mutation Protein Engineering Structure-Activity Relationship Research Support, Non-U.S. Gov't Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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