title: The 4-cysteine zinc-finger motif of the RNA polymerase regulator DksA serves as a thiol switch for sensing oxidative and nitrosative stress.
abstract: We show that thiols in the 4-cysteine zinc-finger motif of DksA, an RNA polymerase accessory protein known to regulate the stringent response, sense oxidative and nitrosative stress. Hydrogen peroxide- or nitric oxide (NO)-mediated modifications of thiols in the DksA 4-cysteine zinc-finger motif release the metal cofactor and drive reversible changes in the α-helicity of the protein. Wild-type and relA spoT mutant Salmonella, but not isogenic dksA-deficient bacteria, experience the downregulation of r-protein and amino acid transport expression after NO treatment, suggesting that DksA can regulate gene expression in response to NO congeners independently of the ppGpp alarmone. Oxidative stress enhances the DksA-dependent repression of rpsM, while preventing the activation of livJ and hisG gene transcription that is supported by reduced, zinc-bound DksA. The inhibitory effects of oxidized DksA on transcription are reversible with dithiothreitol. Our investigations indicate that sensing of reactive species by DksA redox active thiols fine-tunes the expression of translational machinery and amino acid assimilation and biosynthesis in accord with the metabolic stress imposed by oxidative and nitrosative stress. Given the conservation of Cys(114) , and neighbouring hydrophobic and charged amino acids in DksA orthologues, phylogenetically diverse microorganisms may use the DksA thiol switch to regulate transcriptional responses to oxidative and nitrosative stress.
authors.affiliation: Department of Microbiology, University of Colorado School of Medicine, Aurora, CO, USA.
authors.forename: Calvin A
authors.initials: CA
authors.lastname: Henard
authors.forename: Timothy
authors.initials: T
authors.lastname: Tapscott
authors.forename: Matthew A
authors.initials: MA
authors.lastname: Crawford
authors.forename: Maroof
authors.initials: M
authors.lastname: Husain
authors.forename: Paschalis-Thomas
authors.initials: PT
authors.lastname: Doulias
authors.forename: Steffen
authors.initials: S
authors.lastname: Porwollik
authors.forename: Lin
authors.initials: L
authors.lastname: Liu
authors.forename: Michael
authors.initials: M
authors.lastname: McClelland
authors.forename: Harry
authors.initials: H
authors.lastname: Ischiropoulos
authors.forename: Andrés
authors.initials: A
authors.lastname: Vázquez-Torres
mesh_terms: D003545:Cysteine / Q000378:metabolism; D012321:DNA-Directed RNA Polymerases / Q000378:metabolism; D005786:Gene Expression Regulation; D015538:Nitrosation; D010084:Oxidation-Reduction; D018384:Oxidative Stress; D012486:Salmonella typhimurium / Q000201:enzymology* / Q000235:genetics; D013312:Stress, Physiological; D013438:Sulfhydryl Compounds / Q000378:metabolism*; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism*; D016335:Zinc Fingers
chemical_list: D013438:Sulfhydryl Compounds; D014157:Transcription Factors; D012321:DNA-Directed RNA Polymerases; D003545:Cysteine