Persistent super-diffusive motion of Escherichia coli chromosomal loci.

Abstract:

:The physical nature of the bacterial chromosome has important implications for its function. Using high-resolution dynamic tracking, we observe the existence of rare but ubiquitous 'rapid movements' of chromosomal loci exhibiting near-ballistic dynamics. This suggests that these movements are either driven by an active machinery or part of stress-relaxation mechanisms. Comparison with a null physical model for subdiffusive chromosomal dynamics shows that rapid movements are excursions from a basal subdiffusive dynamics, likely due to driven and/or stress-relaxation motion. Additionally, rapid movements are in some cases coupled with known transitions of chromosomal segregation. They do not co-occur strictly with replication, their frequency varies with growth condition and chromosomal coordinate, and they show a preference for longitudinal motion. These findings support an emerging picture of the bacterial chromosome as off-equilibrium active matter and help developing a correct physical model of its in vivo dynamic structure.

journal_name

Nat Commun

journal_title

Nature communications

authors

Javer A,Kuwada NJ,Long Z,Benza VG,Dorfman KD,Wiggins PA,Cicuta P,Lagomarsino MC

doi

10.1038/ncomms4854

subject

Has Abstract

pub_date

2014-05-30 00:00:00

pages

3854

issn

2041-1723

pii

ncomms4854

journal_volume

5

pub_type

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