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DNA mimicking ArdA anti-restriction proteins specifically inhibit restriction (endonuclease) activity of the type I restriction-modification (RM) system. An ArdA monomer is comprised of three α-β domains (the N-domain, Central domain, and C-domain), each with a different fold. Here we describe an alignment of the amino acid (a.a.) sequences of the ArdA with a conserved 20-a.a. motif in the N domain. The N domains of ArdA proteins of the Gram-positive bacteria Arthrobacter sp. and Bifidobacterium longum, and the Gram-negative bacteria Pseu