This family consists of several bacterial TniQ proteins. TniQ along with TniA and B is involved in the transposition of the mercury-resistance transposon Tn5053 which carries the mer operon. It has been suggested that the tni genes are involved in the dissemination of integrons [1].

1: Four genes, two ends, and a res region are involved in transposition of Tn5053: a paradigm for a novel family of transposons carrying either a mer operon or an integron. Kholodii GY, Mindlin SZ, Bass IA, Yurieva OV, Minakhina SV, Nikiforov VG; Mol Microbiol 1995;17:1189-1200. PMID:8594337