Download MendeleyUnexpected structural diversity in DNA recombination: the restriction endonuclease connection.
Hickman, A.B., Li, Y., Mathew, S.V., May, E.W., Craig, N.L., Dyda, F.(2000) Mol Cell 5: 1025-1034
- PubMed: 10911996
- DOI: https://doi.org/10.1016/s1097-2765(00)80267-1
- Primary Citation of Related Structures:
1F1Z - PubMed Abstract:
Transposition requires a coordinated series of DNA breakage and joining reactions. The Tn7 transposase contains two proteins: TnsA, which carries out DNA breakage at the 5' ends of the transposon, and TnsB, which carries out breakage and joining at the 3' ends of the transposon. TnsB is a member of the retroviral integrase superfamily whose hallmark is a conserved DDE motif. We report here the structure of TnsA at 2.4 A resolution. Surprisingly, the TnsA fold is that of a type II restriction endonuclease. Thus, Tn7 transposition involves a collaboration between polypeptides, one containing a DDE motif and one that does not. This result indicates that the range of biological processes that utilize restriction enzyme-like folds also includes DNA transposition.
Organizational Affiliation:
Laboratory of Molecular Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892, USA. ahickman@helix.nih.gov
