Colocalization of distant chromosomal loci in space in E. coli: a bacterial nucleolus.
Colocalization of distant chromosomal loci in space in E. coli: a bacterial nucleolus.
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大肠杆菌中空间中遥远的染色体基因座的共定位:细菌核仁。
DOI:
10.1101/gad.290312.116
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发表时间:
2016-10-15
影响因子:
10.5
通讯作者:
Gourse RL
中科院分区:
文献类型:
--
作者:
Gaal T;Bratton BP;Sanchez-Vazquez P;Sliwicki A;Sliwicki K;Vegel A;Pannu R;Gourse RL
Gaal et al. examined the relative positions of the ribosomal RNA operons in space. The results show that E. coli bacterial chromosome folding in three dimensions is not dictated entirely by genetic position but rather includes functionally related, genetically distant loci that come into close proximity, with rRNA operons forming a structure reminiscent of the eukaryotic nucleolus. The spatial organization of DNA within the bacterial nucleoid remains unclear. To investigate chromosome organization in Escherichia coli, we examined the relative positions of the ribosomal RNA (rRNA) operons in space. The seven rRNA operons are nearly identical and separated from each other by as much as 180° on the circular genetic map, a distance of ≥2 million base pairs. By inserting binding sites for fluorescent proteins adjacent to the rRNA operons and then examining their positions pairwise in live cells by epifluorescence microscopy, we found that all but rrnC are in close proximity. Colocalization of the rRNA operons required the rrn P1 promoter region but not the rrn P2 promoter or the rRNA structural genes and occurred with and without active transcription. Non-rRNA operon pairs did not colocalize, and the magnitude of their physical separation generally correlated with that of their genetic separation. Our results show that E. coli bacterial chromosome folding in three dimensions is not dictated entirely by genetic position but rather includes functionally related, genetically distant loci that come into close proximity, with rRNA operons forming a structure reminiscent of the eukaryotic nucleolus.
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影响因子:
64.5
作者:
Feklistov A;Darst SA
通讯作者:
Darst SA
影响因子:
3.6
作者:
Cabrera, JE;Jin, DJ
通讯作者:
Jin, DJ
影响因子:
3.2
作者:
FRENCH, SL;MILLER, OL
通讯作者:
MILLER, OL
DOI:
10.1038/nrg3454
发表时间:
2013-06
期刊:
Nature reviews. Genetics
影响因子:
--
作者:
通讯作者:
--
影响因子:
3.9
作者:
Liao, DQ
通讯作者:
Liao, DQ