Reference: White MF and Lilley DM (1996) The structure-selectivity and sequence-preference of the junction-resolving enzyme CCE1 of Saccharomyces cerevisiae. J Mol Biol 257(2):330-41

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Abstract


CCE1 is a DNA junction-resolving enzyme involved in the resolution of recombining mitochondrial DNA in Saccharomyces cerevisiae. The CCE1 gene was cloned by PCR, and the expressed protein purified to homogeneity. CCE1 was found to bind to four-way DNA junctions, with a strong structural selectivity. The enzyme binds DNA junctions as a dimer, with slow subunit exchange occurring in free solution. While CCE1 binds equally to synthetic four-way DNA junctions of any sequence, it exhibits pronounced sequence-selectivity in cleavage. Both fixed junctions and those capable of branch migration can be cleaved, with a preference for cleavage at the sequence 5'CT/. Cleavage of junctions tethered to adopt specific stacking isomers demonstrated that the target sequences are cleaved fivefold faster when located on a continuous strand compared to an exchanging strand.

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Journal Article | Research Support, Non-U.S. Gov't
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White MF, Lilley DM
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