Download MendeleyMechanism of Mos1 transposition: insights from structural analysis
Richardson, J.M., Dawson, A., O'hagan, N., Taylor, P., Finnegan, D.J., Walkinshaw, M.D.(2006) EMBO J 25: 1324-1334
- PubMed: 16511570
- DOI: https://doi.org/10.1038/sj.emboj.7601018
- Primary Citation of Related Structures:
2F7T - PubMed Abstract:
We present the crystal structure of the catalytic domain of Mos1 transposase, a member of the Tc1/mariner family of transposases. The structure comprises an RNase H-like core, bringing together an aspartic acid triad to form the active site, capped by N- and C-terminal alpha-helices. We have solved structures with either one Mg2+ or two Mn2+ ions in the active site, consistent with a two-metal mechanism for catalysis. The lack of hairpin-stabilizing structural motifs is consistent with the absence of a hairpin intermediate in Mos1 excision. We have built a model for the DNA-binding domain of Mos1 transposase, based on the structure of the bipartite DNA-binding domain of Tc3 transposase. Combining this with the crystal structure of the catalytic domain provides a model for the paired-end complex formed between a dimer of Mos1 transposase and inverted repeat DNA. The implications for the mechanisms of first and second strand cleavage are discussed.
Organizational Affiliation:
School of Biological Sciences, University of Edinburgh, Edinburgh, UK.
