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Escherichia coli MutS is a versatile repair protein that specifically recognizes not only various types of mismatches but also single stranded loops of up to 4 nucleotides in length. Specific binding, followed by the next step of tracking the DNA helix that locates hemi-methylated sites, is regulated by the conformational state of the protein as a function of ATP binding/hydrolysis. Here, we study...
Complementary pairing by RecA was examined in vitro to investigate how homology is deciphered from non-homology. Somewhere in a window of 40-50% sequence complementarity, RecA pairing begins to manifest the specificity of homology. Quantitation reveals a hierarchy among non-Watson-Crick mispairs: RecA reaction treats six out of 12 possible mispairs as good ones and three each of the remaining ones...
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