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In Escherichia coli, χ (5′-GCTGGTGG-3′) is a recombination hotspot recognized by the RecBCD enzyme. Recognition of χ reduces both nuclease activity and translocation speed of RecBCD and activates RecA-loading ability. RecBCD has two motor subunits, RecB and RecD, which act simultaneously but independently. A longstanding hypothesis to explain the changes elicited by χ interaction has been “ejection”...
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