DNA supercoiling by gyrase is linked to nucleoid compaction.

Abstract:

:The genes of E. coli are located on a circular chromosome of 4.6 million basepairs. This 1.6 mm long molecule is compressed into a nucleoid to fit inside the 1-2 microm cell in a functional format. To examine the role of DNA supercoiling as nucleoid compaction force we modulated the activity of DNA gyrase by electronic, genetic, and chemical means. A model based on physical properties of DNA and other cell components predicts that relaxation of supercoiling expands the nucleoid. Nucleoid size did not increase after reduction of DNA gyrase activity by genetic or chemical means, but nucleoids did expand upon chemical inhibition of gyrase in chloramphenicol-treated cells, indicating that supercoiling may help to compress the genome.

journal_name

Mol Biol Rep

authors

Stuger R,Woldringh CL,van der Weijden CC,Vischer NO,Bakker BM,van Spanning RJ,Snoep JL,Westerhoff HV

doi

10.1023/a:1020318705894

keywords:

subject

Has Abstract

pub_date

2002-01-01 00:00:00

pages

79-82

issue

1-2

eissn

0301-4851

issn

1573-4978

journal_volume

29

pub_type

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