This entry represents the DNAse domain from colicin/pyocin bacteriocins, such as pyocin-S2 from Pseudomonas aeruginosa and colicin E7/E9 from E. coli. This domain has an alpha/beta fold containing a Zn2+ ion binding site [1-5].

1: The crystal structure of the nuclease domain of colicin E7 suggests a mechanism for binding to double-stranded DNA by the H-N-H endonucleases. Cheng YS, Hsia KC, Doudeva LG, Chak KF, Yuan HS; J Mol Biol. 2002;324:227-236. PMID:12441102

2: Metal ions and phosphate binding in the H-N-H motif: crystal structures of the nuclease domain of ColE7/Im7 in complex with a phosphate ion and different divalent metal ions. Sui MJ, Tsai LC, Hsia KC, Doudeva LG, Ku WY, Han GW, Yuan HS; Protein Sci. 2002;11:2947-2957. PMID:12441392

3: DNA binding and degradation by the HNH protein ColE7. Hsia KC, Chak KF, Liang PH, Cheng YS, Ku WY, Yuan HS; Structure. 2004;12:205-214. PMID:14962381

4: Computational redesign of protein-protein interaction specificity. Kortemme T, Joachimiak LA, Bullock AN, Schuler AD, Stoddard BL, Baker D; Nat Struct Mol Biol. 2004;11:371-379. PMID:15034550

5: Structure-based analysis of the metal-dependent mechanism of H-N-H endonucleases. Mate MJ, Kleanthous C; J Biol Chem. 2004;279:34763-34769. PMID:15190054