Architecture of the Escherichia coli nucleoid

English version

Autoři: Subhash C. Verma ^aff001; Zhong Qian ^aff001; Sankar L. Adhya ^aff001
Působiště autorů: Laboratory of Molecular Biology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, Maryland, United States of America ^aff001
Vyšlo v časopise: Architecture of the Escherichia coli nucleoid. PLoS Genet 15(12): e1008456. doi:10.1371/journal.pgen.1008456
Kategorie: Topic Page
prolekare.web.journal.doi_sk: https://doi.org/10.1371/journal.pgen.1008456

Souhrn

How genomes are organized within cells and how the 3D architecture of a genome influences cellular functions are significant questions in biology. A bacterial genomic DNA resides inside cells in a highly condensed and functionally organized form called nucleoid (nucleus-like structure without a nuclear membrane). The Escherichia coli chromosome or nucleoid is composed of the genomic DNA, RNA, and protein. The nucleoid forms by condensation and functional arrangement of a single chromosomal DNA with the help of chromosomal architectural proteins and RNA molecules as well as DNA supercoiling. Although a high-resolution structure of a bacterial nucleoid is yet to come, five decades of research has established the following salient features of the E. coli nucleoid elaborated below: 1) The chromosomal DNA is on the average a negatively supercoiled molecule that is folded as plectonemic loops, which are confined into many independent topological domains due to supercoiling diffusion barriers; 2) The loops spatially organize into megabase size regions called macrodomains, which are defined by more frequent physical interactions among DNA sites within the same macrodomain than between different macrodomains; 3) The condensed and spatially organized DNA takes the form of a helical ellipsoid radially confined in the cell; and 4) The DNA in the chromosome appears to have a condition-dependent 3-D structure that is linked to gene expression so that the nucleoid architecture and gene transcription are tightly interdependent, influencing each other reciprocally. Current advents of high-resolution microscopy, single-molecule analysis and molecular structure determination of the components are expected to reveal the total structure and function of the bacterial nucleoid.

Klíčová slova:

DNA – DNA structure – DNA-binding proteins – Sequence motif analysis – DNA transcription – Bacterial genomics – Condensation – Chromosomal DNA

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