Protease-deficient SOS constitutive cells have RecN-dependent cell division phenotypes.

Abstract:

:In Escherichia coli, after DNA damage, the SOS response increases the transcription (and protein levels) of approximately 50 genes. As DNA repair ensues, the level of transcription returns to homeostatic levels. ClpXP and other proteases return the high levels of several SOS proteins to homeostasis. When all SOS genes are constitutively expressed and many SOS proteins are stabilized by the removal of ClpXP, microscopic analysis shows that cells filament, produce mini-cells and have branching protrusions along their length. The only SOS gene required (of 19 tested) for the cell length phenotype is recN. RecN is a member of the Structural Maintenance of Chromosome (SMC) class of proteins. It can hold pieces of DNA together and is important for double-strand break repair (DSBR). RecN is degraded by ClpXP. Overexpression of recN+ in the absence of ClpXP or recN4174 (A552S, A553V), a mutant not recognized by ClpXP, produce filamentous cells with nucleoid partitioning defects. It is hypothesized that when produced at high levels during the SOS response, RecN interferes with nucleoid partitioning and Z-Ring function by holding together sections of the nucleoid, or sister nucleoids, providing another way to inhibit cell division.

journal_name

Mol Microbiol

journal_title

Molecular microbiology

authors

Warr AR,Klimova AN,Nwaobasi AN,Sandler SJ

doi

10.1111/mmi.14162

subject

Has Abstract

pub_date

2019-02-01 00:00:00

pages

405-422

issue

2

eissn

0950-382X

issn

1365-2958

journal_volume

111

pub_type

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