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The ubiquitous Y-family of DNA polymerases, exemplified by the Escherichia coli UmuC protein (the catalytic subunit of DNA Pol V), possess the remarkable ability to replicate imperfect DNA templates that cannot be replicated by other types of DNA polymerases. Since this ability comes at the cost of a reduced fidelity, it is important that organisms manage these unique polymerases to coordinate their...
In Escherichia coli, RecA-mediated cleavage of LexA repressor is a key regulatory event required for expression of SOS genes involved in the repair of DNA damage. RecA also mediates the cleavage of UmuD protein to UmuD′, a form active in SOS mutagenesis. To determine whether LexA and UmuD have common binding determinants on RecA, we have compared the ability of several recA mutants to function in...
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