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Global regulator H-NS and lipoprotein NlpI influence production of extracellular DNA in Escherichia coli.

Abstract：

:Extracellular DNA (eDNA) is a structural component of the polymeric matrix of biofilms from different species. Different mechanisms for DNA release have been proposed including lysis of cells, lysis of DNA-containing vesicles, and DNA secretion. Here, a genome-wide screen of 3985 non-lethal mutations was performed to identify genes whose deletion alters eDNA release in Escherichia coli. Deleting nlpI, yfeC, and rna increased eDNA from planktonic cultures while deleting hns and rfaD decreased eDNA production. The lipoprotein NlpI negatively affects eDNA release since the overexpression of nlpI decreases eDNA 16 fold while deleting nlpI increases eDNA threefold. The global regulator H-NS is required for eDNA production since DNA was not detected for the hns mutant and production of H-NS restored eDNA production to wild-type levels. Therefore our results suggest that secretion may play a role in eDNA release in E. coli since the effect of the hns deletion on cell lysis (slight decrease) and membrane vesicles (threefold increase) does not account for the reduction in eDNA.

journal_name

Biochem Biophys Res Commun

journal_title

Biochemical and biophysical research communications

authors

Sanchez-Torres V,Maeda T,Wood TK

doi

10.1016/j.bbrc.2010.09.026

subject

Has Abstract

pub_date

2010-10-15 00:00:00

pages

197-202

issue

2

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(10)01701-8

journal_volume

401

pub_type

杂志文章

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