Nur, a nickel-responsive regulator of the Fur family, regulates superoxide dismutases and nickel transport in Streptomyces coelicolor

Bo Eun Ahn, Joonseok Cha, Eun Jin Lee, Ah Reum Han, Charles J. Thompson, Jung Hye Roe

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Nickel serves as a cofactor for various microbial enzymes including superoxide dismutase (SOD) found in Streptomyces spp. In Streptomyces coelicolor, nickel represses and induces production of Fe-containing and Ni-containing SODs, respectively, primarily at the transcriptional level. We identified the nickel-responsive regulator (Nur), a Fur (ferric-uptake regulator) homologue, which binds to the promoter region of the sodF gene encoding FeSOD in the presence of nickel. Disruption of the nur gene caused constitutive expression of FeSOD and no induction of NiSOD in the presence of nickel. The intracellular level of nickel was higher in a Δnur mutant than in the wild type, suggesting that Nur also regulates nickel uptake in S. coelicolor. A putative nickel-transporter gene cluster (nikABCDE) was identified in the genome database. Its transcription was negatively regulated by Nur in the presence of nickel. Purified Nur protein bound to the nikA promoter region in a nickel-dependent way. These results support the action of Nur as a regulator of nickel homeostasis and antioxidative response in S. coelicolor, and add a novel nickel-responsive member to the list of versatile metal-specific regulators of the Fur family.

Original languageEnglish (US)
Pages (from-to)1848-1858
Number of pages11
JournalMolecular Microbiology
Issue number6
Publication statusPublished - Mar 2006


ASJC Scopus subject areas

  • Molecular Biology
  • Microbiology

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