Chest 2005,128(4):2732–2738.PubMedCrossRef 35. Ythier M, Entenza JM, Bille J, Vandenesch F, Bes M, Moreillon P, Sakwinska

O: Natural variability of in vitro adherence to fibrinogen and fibronectin does not correlate with S3I-201 cost in vivo infectivity of Staphylococcus aureus . Infect Immun 2010,78(4):1711–1716.PubMedCrossRef Authors’ contributions JPR, YL carried out the ex vivo adhesion and invasion assays. AM, OD carried out the adhesion and RT-PCR assays. JPR and OD drafted the manuscript. GL, AT, MB participated in the design of the study and performed the statistical analysis. GL, FL, FV, JE conceived of the study, and participated in its design and coordination and helped to draft the manuscript. All authors read and approved the final manuscript.”
“Background DNA topoisomerases catalyze topological transformations of DNA by see more concerted find more breaking and rejoining of DNA strands via the formation of a covalent complex between the enzyme and cleaved DNA [1]. While the activities of topoisomerases are critical for vital cellular functions, topoisomerase enzymes are also vulnerable targets for cell killing because DNA rejoining by topoisomerases can often be inhibited by antibacterial or anticancer agents that are referred to as topoisomerase poisons [2, 3]. Quinolones are widely used antibacterial drugs that lead to the accumulation of covalent cleavage complex formed by the bacterial

type IIA topoisomerases, DNA gyrase and topoisomerase IV [4, 5]. The accumulation of DNA gyrase covalent complex from the action of quinolones has been shown to induce an oxidative damage cell death pathway in E. coli as at least one of the potential mechanisms of cell killing [6–9]. The

sequence of events following topoisomerase cleavage complex accumulation that leads to generation of reactive oxygen species remains unclear. Although a specific poison for bacterial topoisomerase I remains to be identified, accumulation of topoisomerase I cleavage complex in E. coli has also been shown to lead to rapid cell death from 3-mercaptopyruvate sulfurtransferase the study of topoisomerase I mutants defective in DNA rejoining [10, 11]. Similar to gyrase cleavage complex, topoisomerase I cleavage complex accumulation in E. coli induces the SOS response via the RecBCD pathway [12]. Increase in reactive oxygen species has been shown to also contribute to the cell death pathway initiated by accumulation of topoisomerase I cleavage complex [13]. Recombinant E. coli and Yersinia pestis topoisomerase I mutants that accumulate the covalent cleavage complex due to deficiency in DNA rejoining provide useful model systems for studying the physiological effect of topoisomerase-DNA cleavage complex accumulation. Y. pestis topoisomerase I (YpTOP1) is highly homologous to E. coli topoisomerase I, with the advantage of its dominant lethal recombinant clones being more stable in E. coli than comparable E. coli topoisomerase I mutant clones. The Y.