Metalloregulation DNA-binding stress protein; Forms highly stable, multimeric protein-DNA complexes which accumulate in stationary-phase cells and protect against oxidative killing; Belongs to the Dps family.

Transcriptional regulator (DtxR family); Central regulator of manganese homeostasis that regulates the expression of both manganese uptake and efflux systems. In the presence of high levels of manganese, it mediates repression of the manganese uptake systems MntH and MntABCD and activation of the efflux systems MneP and MneS. Binds with high affinity to the regulatory regions of its target genes. The manganese concentration required for activation of efflux is higher than that for repression of uptake ; Belongs to the DtxR/MntR family.

Alkyl hydroperoxide reductase (small subunit); Thiol-specific peroxidase that catalyzes the reduction of hydrogen peroxide and organic hydroperoxides to water and alcohols, respectively. Plays a role in cell protection against oxidative stress by detoxifying peroxides; Belongs to the peroxiredoxin family. AhpC/Prx1 subfamily.

Vegetative catalase 1; Decomposes hydrogen peroxide into water and oxygen; serves to protect cells from the toxic effects of hydrogen peroxide.

Transcriptional repressor; Negatively regulates yodC and azoR1 which may contribute to the degradation of aromatic compounds. Probably positively regulates the catechol-specific transcription of mhqNOP, mhqED, and mhqA.

Zn transporter; Couples the hydrolysis of ATP with the transport of zinc into the cell. Plays an important role in protecting cells against oxidative stress. ZosA-mediated zinc transport is required for post- transcriptional control of comK and competence development.

Transcriptional regulator; Controls the expression of the cellular protein quality control genes clpC, clpE and clpP, as well as mcsA and mcsB. Acts as a repressor of these class III stress genes by binding to a directly repeated heptanucleotide operator sequence (A/GGTCAAA NAN A/GGTCAAA). After heat shock, CtsR is degraded by the ClpCP and ClpEP proteolytic systems, ensuring the derepression of clpE, clpP and the clpC operon. CtsR negatively autoregulates its own synthesis.

Thioredoxin; Participates in various redox reactions through the reversible oxidation of its active center dithiol to a disulfide and catalyzes dithiol-disulfide exchange reactions.

Superoxide dismutase; Destroys superoxide anion radicals which are normally produced within the cells and which are toxic to biological systems; Belongs to the iron/manganese superoxide dismutase family.