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Nur, a nickel‐responsive regulator of the Fur family, regulates superoxide dismutases and nickel transport in Streptomyces coelicolor
Author(s) -
Ahn BoEun,
Cha Joonseok,
Lee EunJin,
Han AhReum,
Thompson Charles J.,
Roe JungHye
Publication year - 2006
Publication title -
molecular microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.857
H-Index - 247
eISSN - 1365-2958
pISSN - 0950-382X
DOI - 10.1111/j.1365-2958.2006.05065.x
Subject(s) - streptomyces coelicolor , biology , nickel , regulator , mutant , superoxide dismutase , gene , promoter , streptomyces , biochemistry , microbiology and biotechnology , genetics , enzyme , gene expression , chemistry , bacteria , organic chemistry
Summary 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 ( f erric‐ u ptake r egulator) 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.