The Toxin-Antitoxin System DarTG Catalyzes Reversible ADP-Ribosylation of DNA.
The Toxin-Antitoxin System DarTG Catalyzes Reversible ADP-Ribosylation of DNA.
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DOI:
10.1016/j.molcel.2016.11.014
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发表时间:
2016-12-15
期刊:
影响因子:
16
通讯作者:
Ahel, Ivan
中科院分区:
文献类型:
--
作者:
Jankevicius, Gytis;Ariza, Antonio;Ahel, Marijan;Ahel, Ivan
The discovery and study of toxin-antitoxin (TA) systems helps us advance our understanding of the strategies prokaryotes employ to regulate cellular processes related to the general stress response, such as defense against phages, growth control, biofilm formation, persistence, and programmed cell death. Here we identify and characterize a TA system found in various bacteria, including the global pathogen Mycobacterium tuberculosis. The toxin of the system (DarT) is a domain of unknown function (DUF) 4433, and the antitoxin (DarG) a macrodomain protein. We demonstrate that DarT is an enzyme that specifically modifies thymidines on single-stranded DNA in a sequence-specific manner by a nucleotide-type modification called ADP-ribosylation. We also show that this modification can be removed by DarG. Our results provide an example of reversible DNA ADP-ribosylation, and we anticipate potential therapeutic benefits by targeting this enzyme-enzyme TA system in bacterial pathogens such as M. tuberculosis. DarTG is a toxin-antitoxin module DarT (DUF4433) ADP-ribosylates thymidines on ssDNA in a sequence-specific manner DarG (macrodomain) reverses DarT-catalyzed DNA ADP-ribosylation DarTG activities are conserved in Mycobacterium tuberculosis Toxin-antitoxin systems are important regulators of bacterial survival. Jankevicius et al. present a structural and biochemical analysis of DarTG and identify its role in reversible ADP-ribosylation of DNA. Their findings may lead to new developments in biotechnology and therapeutic opportunities in the fight against bacterial infections.
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