Escherichia coli response to hydrogen peroxide: A role for DNA supercoiling, Topoisomerase I and Fis

Dalit Weinstein-Fischer, Maya Elgrably-Weiss, Shoshy Altuvia*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

97 Scopus citations

Abstract

Bacterial cells respond to the deleterious effects of reactive oxygen species by inducing the expression of antioxidant defence genes. Here we show that treatment with hydrogen peroxide leads to a transient decrease in DNA negative supercoiling. We also report that hydrogen peroxide activates topA P1 promoter expression. The peroxide-dependent topA P1 activation is independent of oxyR, but is mediated by Fis. This nucleoid-associated protein binds to the promoter region of topA. We also show that a fis deficient mutant strain is extremely sensitive to hydrogen peroxide. Our results suggest that topA activation by Fis is an important component of the Escherichia coli response to oxidative stress.

Original languageAmerican English
Pages (from-to)1413-1420
Number of pages8
JournalMolecular Microbiology
Volume35
Issue number6
DOIs
StatePublished - 2000

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