The transcriptional repressor protein NsrR senses nitric oxide directly via a [2Fe-2S] cluster

PloS One
Nicholas P TuckerMatthew I Hutchings

Abstract

The regulatory protein NsrR, a member of the Rrf2 family of transcription repressors, is specifically dedicated to sensing nitric oxide (NO) in a variety of pathogenic and non-pathogenic bacteria. It has been proposed that NO directly modulates NsrR activity by interacting with a predicted [Fe-S] cluster in the NsrR protein, but no experimental evidence has been published to support this hypothesis. Here we report the purification of NsrR from the obligate aerobe Streptomyces coelicolor. We demonstrate using UV-visible, near UV CD and EPR spectroscopy that the protein contains an NO-sensitive [2Fe-2S] cluster when purified from E. coli. Upon exposure of NsrR to NO, the cluster is nitrosylated, which results in the loss of DNA binding activity as detected by bandshift assays. Removal of the [2Fe-2S] cluster to generate apo-NsrR also resulted in loss of DNA binding activity. This is the first demonstration that NsrR contains an NO-sensitive [2Fe-2S] cluster that is required for DNA binding activity.

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Related Concepts

Bacterial Proteins
DNA, Double-Stranded
Electron Spin Resonance Spectroscopy
Iron-Sulfur Proteins
Nitric Oxide
Transcriptional Silencing Factors
Transcription, Genetic
Spectroscopy, Mossbauer
Determination, Sequence Homology
Streptomyces coelicolor A3(2)

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