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  • Title: Antirestriction Protein ArdB (R64) Interacts with DNA.
    Author: Kudryavtseva AA, Okhrimenko IS, Didina VS, Zavilgelsky GB, Manukhov IV.
    Journal: Biochemistry (Mosc); 2020 Mar; 85(3):318-325. PubMed ID: 32564736.
    Abstract:
    The antirestriction ArdB protein inhibits the endonuclease activity of type I restriction/modification (RM) systems in vivo; however, the mechanism of inhibition remains unknown. In this study, we showed that recombinant ArdB from Escherichia coli cells co-purified with DNA. When overexpressed in E. coli cells, a portion of ArdB protein formed insoluble DNA-free aggregates. Only native ArdB, but not the ArdBΔD141 mutant lacking the antirestriction activity, co-purified with DNA upon anion-exchange and affinity chromatography or total DNA isolation from formaldehyde-treated cells. These observations confirm the hypothesis that ArdB blocks DNA translocation via the R subunits of the R2M2S complex of type I RM enzymes.
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