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Maintenance of genomic stability is critical for all cells. Homologous recombination (HR) pathways promote genome stability using evolutionarily conserved proteins such as RecA, SSB, and RecQ, the Escherichia coli homologue of five human proteins at least three of which suppress genome instability and cancer. A previous report indicated that RecQ promotes the net accumulation in cells of intermolecular...
Single-strand-dependent DNA exonucleases play important roles in DNA repair and recombination in all organisms. In Escherichia coli the redundant functions provided by the RecJ, ExoI, ExoVII and ExoX exonucleases are required for mismatch repair, UV resistance and homologous recombination. We have examined whether the xni gene product, the single-strand exonuclease ExoIX, is also a member of this...
Plasmid-based cloning and expression of genes in Escherichia coli can have several problems: plasmid destabilization; toxicity of gene products; inability to achieve complete repression of gene expression; non-physiological overexpression of the cloned gene; titration of regulatory proteins; and the requirement for antibiotic selection. We describe a simple system for cloning and expression of genes...
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