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Microcin B17 (MccB17) is a peptide-based bacterial toxin that targets DNA gyrase, the bacterial enzyme that introduces supercoils into DNA. The site and mode of action of MccB17 on gyrase are unclear. We review what is currently known about MccB17-gyrase interactions and summarise approaches to understanding its mode of action that involve modification of the toxin. We describe experiments in which...
The level of negative DNA supercoiling of the Escherichia coli chromosome is tightly regulated in the cell and influences many DNA metabolic processes including DNA replication, transcription, repair and recombination. Gyrase is the only type II topoisomerase able to introduce negative supercoils into DNA, a unique ability that arises from the specialized C-terminal DNA wrapping domain of the GyrA...
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