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- W2147281068 abstract "ABSTRACT The CcrM DNA methyltransferase of the α-proteobacteria catalyzes the methylation of the adenine in the sequence GAnTC. Like Dam in the enterobacteria, CcrM plays a regulatory role in Caulobacter crescentus and Rhizobium meliloti . CcrM is essential for viability in both of these organisms, and we show here that it is also essential in Brucella abortus . Further, increased copy number of the ccrM gene results in striking changes in B. abortus morphology, DNA replication, and growth in murine macrophages. We generated strains that carry ccrM either on a low-copy-number plasmid (strain GR131) or on a moderate-copy-number plasmid (strain GR132). Strain GR131 has wild-type morphology and chromosome number, as assessed by flow cytometry. In contrast, strain GR132 has abnormal branched morphology, suggesting aberrant cell division, and increased chromosome number. Although these strains exhibit different morphologies and DNA content, the replication of both strains in macrophages is attenuated. These data imply that the reduction in survival in host cells is not due solely to a cell division defect but is due to additional functions of CcrM. Because CcrM is essential in B. abortus and increased ccrM copy number attenuates survival in host cells, we propose that CcrM is an appropriate target for new antibiotics." @default.
- W2147281068 created "2016-06-24" @default.
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- W2147281068 date "2000-06-15" @default.
- W2147281068 modified "2023-09-28" @default.
- W2147281068 title "The <i>Brucella abortus</i> CcrM DNA Methyltransferase Is Essential for Viability, and Its Overexpression Attenuates Intracellular Replication in Murine Macrophages" @default.
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- W2147281068 doi "https://doi.org/10.1128/jb.182.12.3482-3489.2000" @default.
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