Early intermediates of mariner transposition: catalysis without synapsis of the transposon ends suggests a novel architecture of the synaptic complex

Molecular and Cellular Biology
Karen LipkowRonald Chalmers

Abstract

The mariner family is probably the most widely distributed family of transposons in nature. Although these transposons are related to the well-studied bacterial insertion elements, there is evidence for major differences in their reaction mechanisms. We report the identification and characterization of complexes that contain the Himar1 transposase bound to a single transposon end. Titrations and mixing experiments with the native transposase and transposase fusions suggested that they contain different numbers of transposase monomers. However, the DNA protection footprints of the two most abundant single-end complexes are identical. This indicates that some transposase monomers may be bound to the transposon end solely by protein-protein interactions. This would mean that the Himar1 transposase can dimerize independently of the second transposon end and that the architecture of the synaptic complex has more in common with V(D)J recombination than with bacterial insertion elements. Like V(D)J recombination and in contrast to the case for bacterial elements, Himar1 catalysis does not appear to depend on synapsis of the transposon ends, and the single-end complexes are active for nicking and probably for cleavage. We discuss the r...Continue Reading

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Citations

Aug 4, 2009·Genetica·Corentin Claeys Bouuaert, Ronald M Chalmers
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Nov 30, 2006·Molecular and Cellular Biology·Danxu LiuRonald Chalmers
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Jun 25, 2015·Microbiology Spectrum·Michael TellierRonald Chalmers

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