DNA ADP-ribosyl transferase

UniProtKB accession:  A0A0B0SG80

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UniProtKB description:  Toxic component of the hybrid type II/IV toxin-antitoxin (TA) system DarTG, which plays a crucial role in controlling bacterial growth and bacteriophage infection (By similarity). In case of phage infection, DarT toxin ADP-ribosylates DNA, which inhibits both viral DNA and RNA synthesis and leads to abortive infection (By similarity). ADP-ribosylates ssDNA on the second thymidine of the consensus sequence 5'-TNTC-3'; the protein does not auto-modify. Arg-51 is highly flexible, allowing it to assume multiple positions in the crystal structures (PubMed:34408320). Its toxic effect is neutralized by cognate antitoxin DarG (By similarity).