Mis-regulation of Zn and Mn homeostasis is a key phenotype of Cu stress in Streptococcus pyogenes.

Hong, YoungJin; Mackenzie, Eilidh S; Firth, Samantha J; Bolton, Jack R F; Stewart, Louisa J; Waldron, Kevin J; Djoko, Karrera Y

Abstract

All bacteria possess homeostastic mechanisms that control the availability of micronutrient metals within the cell. Cross-talks between different metal homeostasis pathways within the same bacterial organism have been reported widely. In addition, there have been previous suggestions that some metal uptake transporters can promote adventitious uptake of the wrong metal. This work describes the cross-talk between Cu and the Zn and Mn homeostasis pathways in Group A Streptococcus (GAS). Using a ∆copA mutant strain that lacks the primary Cu efflux pump and thus traps excess Cu in the cytoplasm, we show that growth in the presence of supplemental Cu promotes downregulation of genes that contribute to Zn or Mn uptake. This effect is not associated with changes in cellular Zn or Mn levels. Co-supplementation of the culture medium with Zn or, to a lesser extent, Mn alleviates key Cu stress phenotypes, namely bacterial growth and secretion of the fermentation end-product lactate. However, neither co-supplemental Zn nor Mn influences cellular Cu levels or Cu availability in Cu-stressed cells. In addition, we provide evidence that the Zn or Mn uptake transporters in GAS do not promote Cu uptake. Together, the results from this study strengthen and extend our previous proposal that mis-regulation of Zn and Mn homeostasis is a key phenotype of Cu stress in GAS. [Abstract copyright: © The Author(s) 2023. Published by Oxford University Press.]

Citation

Hong, Y., Mackenzie, E. S., Firth, S. J., Bolton, J. R. F., Stewart, L. J., Waldron, K. J., & Djoko, K. Y. (2023). Mis-regulation of Zn and Mn homeostasis is a key phenotype of Cu stress in Streptococcus pyogenes. Metallomics, 15(11), Article mfad064. https://doi.org/10.1093/mtomcs/mfad064

• Journal Article Type: Article
• Acceptance Date: Oct 16, 2023
• Online Publication Date: Oct 17, 2023
• Publication Date: 2023-11
• Deposit Date: Dec 20, 2023
• Publicly Available Date: Dec 20, 2023
• Journal: Metallomics : integrated biometal science
• Print ISSN: 1756-5901
• Electronic ISSN: 1756-591X
• Publisher: Oxford University Press
• Peer Reviewed: Peer Reviewed
• Volume: 15
• Issue: 11
• Article Number: mfad064
• DOI: https://doi.org/10.1093/mtomcs/mfad064
• Keywords: metal uptake, streptococcus, metal toxicity, zinc, metal homeostasis, copper
• Public URL: https://durham-repository.worktribe.com/output/1883876