6GTR

Structure of the AtaT Y144F mutant toxin bound to the C-terminus of the antitoxin AtaR and Acetyl-CoA

Summary for 6GTR

• Entry DOI: 10.2210/pdb6gtr/pdb
• Descriptor: N-acetyltransferase, DUF1778 domain-containing protein, ACETYL COENZYME *A, ... (6 entities in total)
• Functional Keywords: ta toxin, antitoxin, n-acetyl transferase, ribbon-helix-helix, rhh, bacterial repressor, transcription, toxin-antitoxin complex
• Biological source: Escherichia coli; More
• Total number of polymer chains: 4
• Total formula weight: 51235.75

Authors

Garcia-Pino, A.,Jurenas, D. (deposition date: 2018-06-18, release date: 2019-03-06, Last modification date: 2024-01-17)

Primary citation

Jurenas, D.,Van Melderen, L.,Garcia-Pino, A.
Mechanism of regulation and neutralization of the AtaR-AtaT toxin-antitoxin system.
Nat. Chem. Biol., 15:285-294, 2019

PubMed Abstract: 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. 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.

PubMed: 30718814
DOI: 10.1038/s41589-018-0216-z

Experimental method

X-RAY DIFFRACTION (2.99 Å)