Transposase proteins are necessary for efficient DNA transposition. This family includes IS66 from Agrobacterium tumefaciens [2].

1: An open reading frame downstream of Rhizobium meliloti nodQ1 shows nucleotide sequence similarity to an Agrobacterium tumefaciens insertion sequence. Schwedock J, Long SR; Mol Plant Microbe Interact 1994;7:151-153. PMID:8167368

2: Nucleotide sequence of the insertion sequence found in the T-DNA region of mutant Ti plasmid pTiA66 and distribution of its homologues in octopine Ti plasmid. Machida Y, Sakurai M, Kiyokawa S, Ubasawa A, Suzuki Y, Ikeda JE; Proc Natl Acad Sci USA 1984;81:7495-7499. PMID:6095299