6gto

Structure of the AtaR antitoxin

spinqualitylabelsall models 6gto, resolution 2.97Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6gto is a 1 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: NA Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed GCN5-related N-acetyl-transferase (GNAT)-like enzymes from toxin-antitoxin modules are strong inhibitors of protein synthesis. Here, we present the bases of the regulatory mechanisms of ataRT, a model GNAT-toxin-antitoxin module, from toxin synthesis to its action as a transcriptional de-repressor. We show the antitoxin (AtaR) traps the toxin (AtaT) in a pre-catalytic monomeric state and precludes the effective binding of ac-CoA and its target Met-transfer RNA(fMet). In the repressor complex, AtaR intrinsically disordered region interacts with AtaT at two different sites, folding into different structures, that are involved in two separate functional roles, toxin neutralization and placing the DNA-binding domains of AtaR in a binding-compatible orientation. Our data suggests AtaR neutralizes AtaT as a monomer, right after its synthesis and only the toxin-antitoxin complex formed in this way is an active repressor. Once activated by dimerization, later neutralization of the toxin results in a toxin-antitoxin complex that is not able to repress transcription. Mechanism of regulation and neutralization of the AtaR-AtaT toxin-antitoxin system.,Jurenas D, Van Melderen L, Garcia-Pino A Nat Chem Biol. 2019 Mar;15(3):285-294. doi: 10.1038/s41589-018-0216-z. Epub 2019 , Feb 4. PMID:30718814 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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