Crosstalk between transposase subunits during cleavage of the mariner transposon.

Abstract:

:Mariner transposition is a complex reaction that involves three recombination sites and six strand breaking and joining reactions. This requires precise spatial and temporal coordination between the different components to ensure a productive outcome and minimize genomic instability. We have investigated how the cleavage events are orchestrated within the mariner transpososome. We find that cleavage of the non-transferred strand is completed at both transposon ends before the transferred strand is cleaved at either end. By introducing transposon-end mutations that interfere with cleavage, but leave transpososome assembly unaffected, we demonstrate that a structural transition preceding transferred strand cleavage is coordinated between the two halves of the transpososome. Since mariner lacks the DNA hairpin intermediate, this transition probably reflects a reorganization of the transpososome to allow the access of different monomers onto the second pair of strands, or the relocation of the DNA within the same active site between two successive hydrolysis events. Communication between transposase subunits also provides a failsafe mechanism that restricts the generation of potentially deleterious double-strand breaks at isolated sites. Finally, we identify transposase mutants that reveal that the conserved WVPHEL motif provides a structural determinant of the coordination mechanism.

journal_name

Nucleic Acids Res

journal_title

Nucleic acids research

authors

Claeys Bouuaert C,Walker N,Liu D,Chalmers R

doi

10.1093/nar/gku172

subject

Has Abstract

pub_date

2014-05-01 00:00:00

pages

5799-808

issue

9

eissn

0305-1048

issn

1362-4962

pii

gku172

journal_volume

42

pub_type

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