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In Escherichia coli, homologous recombination initiated at double-stranded DNA breaks requires the RecBCD enzyme, a multifunctional heterotrimeric complex that possesses processive helicase and exonuclease activities. Upon encountering the DNA regulatory sequence, χ, the enzymatic properties of RecBCD enzyme are altered. Its helicase activity is reduced, the 3′→5′nuclease activity is attenuated, the...
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