Journal
CELL CYCLE
Volume 13, Issue 18, Pages 2812-2820Publisher
LANDES BIOSCIENCE
DOI: 10.4161/15384101.2014.950892
Keywords
RecBCD; AddAB; Nuclease; Chi recognition; Homologous recomb-ination
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Funding
- Cancer Research UK
- Cancer Research UK [12799] Funding Source: researchfish
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AddAB and RecBCD-type helicase-nuclease complexes control the first stage of bacterial homologous recombination (HR) - the resection of double strand DNA breaks. A switch in the activities of the complexes to initiate repair by HR is regulated by a short, species-specific DNA sequence known as a Crossover Hotspot Instigator (Chi) site. It has been shown that, upon encountering Chi, AddAB and RecBCD pause translocation before resuming at a reduced rate. Recently, the structure of B.subtilis AddAB in complex with its regulatory Chi sequence revealed the nature of Chi binding and the paused translocation state. Here the structural features associated with Chi binding are described in greater detail and discussed in relation to the related E.coli RecBCD system.
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