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• W2801814227 abstract "Transition metal homeostasis is necessary to sustain life. First row transition metals act as cofactors within the cell, performing vital functions ranging from DNA repair to respiration. However, intracellular metal concentrations exceeding physiological requirements may be toxic. In E. coli, the YqjH flavoprotein is thought to play a role in iron homeostasis. YqjH is transcriptionally regulated by the ferric uptake regulator and a newly discovered regulator encoded by yqjI. The apo-form of YqjI is a transcriptional repressor of both the yqjH and yqjI genes. YqjI repressor function is disrupted upon binding of nickel. The YqjI N-terminus is homologous to nickel-binding proteins, implicating this region as a nickel-binding domain. Based on function, yqjI and yqjH should be renamed Ni-responsive Fe-uptake regulator (nfeR) and Ni-responsive Fe-uptake flavoprotein (nfeF), respectively. X-ray Absorption Spectroscopy was employed to characterize the nickel binding site(s) within YqjI. Putative nickel binding ligands were targeted by site-directed mutagenesis and resulting variants were analyzed in vivo for repressor function. Isothermal titration calorimetry and competitive binding assays were used to further quantify nickel interactions with wild-type YqjI and its mutant derivatives. Results indicate plasticity in the nickel binding domain of YqjI. Residues C42 and C43 were found to be required for in vivo response of YqjI to nickel stress, though these residues are not required for in vitro nickel binding. We propose that YqjI may contain a vicinal disulfide bond between C42 and C43 that is important for nickel-responsive allosteric interactions between YqjI domains." @default.
• W2801814227 created "2018-05-17" @default.
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• W2801814227 date "2018-07-01" @default.
• W2801814227 modified "2023-09-27" @default.
• W2801814227 title "Conserved cysteine residues are necessary for nickel-induced allosteric regulation of the metalloregulatory protein YqjI (NfeR) in E. coli" @default.
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• W2801814227 doi "https://doi.org/10.1016/j.jinorgbio.2018.04.016" @default.
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