1887

Abstract

Dps family proteins have the ferroxidase activity that contributes to oxidative stress resistance. In addition, a part of Dps family proteins including Dps and MrgA (metallo regulon gene A) bind DNA and induce the structural change of the nucleoid. We previously showed that a mutated MrgA with reduced ferroxidase activity was unable to contribute to the hydrogen peroxide (HO) and UV resistance in , suggesting that the nucleoid clumping by MrgA is not sufficient for the resistance. However, it remained elusive whether the nucleoid clumping is dispensable for the resistance. Here, we aimed to clarify this question by employing the Dps lacking DNA-binding activity, DpsΔ18. Staphylococcal nucleoid was clumped by Dps, but not by DpsΔ18. HO stress assay indicated that Dps and DpsΔ18 restored the reduced susceptibility of Δ. Thus, we concluded that the staphylococcal nucleoid clumping is dispensable for the Dps-mediated HO resistance. In contrast, Dps was unable to complement Δ in the UV resistance, suggesting the MrgA function that cannot be compensated for by Dps.

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2016-10-01
2020-04-03
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