This family consists of several enterobacterial TraY proteins. TraY is involved in bacterial conjugation where it is required for efficient nick formation in the F plasmid [1]. These proteins have a ribbon-helix-helix fold and are likely to be DNA-binding proteins.

1: Nucleotide and amino acid sequences of oriT-traM-traJ-traY-traA-traL regions and mobilization of virulence plasmids of Salmonella enterica serovars enteritidis, gallinarum-pullorum, and typhimurium. Chu C, Chiu CH, Chu CH, Ou JT; J Bacteriol 2002;184:2857-2862. PMID:12003924