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Organization and segregation of bacterial chromosomes

2013; Nature Portfolio; Volume: 14; Issue: 3 Linguagem: Inglês

10.1038/nrg3375

1471-0064

Xindan Wang, Paula Montero Llopis, David Z. Rudner,

RNA and protein synthesis mechanisms

Bacterial chromosomes were originally thought to be unstructured and largely unconstrained, but recent advances have supplemented historical research to reveal a highly structured and dynamic chromosome organization. This Review discusses our latest understanding of bacterial chromosome organization, including how the simultaneous nature of DNA replication and chromosome segregation in bacteria necessitates intricate interplay between these processes. The bacterial chromosome must be compacted more than 1,000-fold to fit into the compartment in which it resides. How it is condensed, organized and ultimately segregated has been a puzzle for over half a century. Recent advances in live-cell imaging and genome-scale analyses have led to new insights into these problems. We argue that the key feature of compaction is the orderly folding of DNA along adjacent segments and that this organization provides easy and efficient access for protein–DNA transactions and has a central role in driving segregation. Similar principles and common proteins are used in eukaryotes to condense and to resolve sister chromatids at metaphase.