Proteomic responses to a methyl viologen-induced oxidative stress in the wild type and FerB mutant strains of Paracoccus denitrificans

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Publikace nespadá pod Ekonomicko-správní fakultu, ale pod Přírodovědeckou fakultu. Oficiální stránka publikace je na webu muni.cz.
Název česky Proteomická odezva na oxidační stres vyvolaný methylviologenem u divokého a FerB-mutentního kmene Paracoccus denitrificans
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PERNIKÁŘOVÁ Vendula SEDLÁČEK Vojtěch POTĚŠIL David PROCHÁZKOVÁ Iva ZDRÁHAL Zbyněk BOUCHAL Pavel KUČERA Igor

Rok publikování 2015
Druh Článek v odborném periodiku
Časopis / Zdroj Journal of Proteomics
Fakulta / Pracoviště MU

Přírodovědecká fakulta

Citace
www http://www.sciencedirect.com/science/article/pii/S1874391915002201
Doi http://dx.doi.org/10.1016/j.jprot.2015.05.002
Obor Biochemie
Klíčová slova Paracoccus denitrificans; methyl viologen; oxidative stress; flavoprotein; flavin reductase; microbial proteomics
Popis FerB is a cytoplasmic flavoprotein from the soil bacterium Paracoccus denitrificans with a putative role in defense against oxidative stress. To further explore this hypothesis, we compared protein variations upon methyl viologen treatment in wild-type and FerB mutant strains by a quantitative proteomic analysis based on iTRAQ-3DLC–MS/MS analysis. The proteins showing the most prominent increase in abundance were assigned to carbon fixation and sulfur assimilatory pathways. By employing these proteins as indirect markers, oxidative stress was found to be 15% less severe in the wild-type than in the FerB-deficient mutant cells. Oxidative stress altered the levels of proteins whose expression is dependent on the transcriptional factor FnrP. The observed down-regulation of the fnrP regulon members, most notably that of nitrous oxide reductase, was tentatively explained by an oxidative degradation of the [4Fe–4S] center of FnrP leading to a protein form which no longer activates transcription. While the level of FerB remained relatively constant, two proteins homologous to FerB accumulated during oxidative stress. When their genes were expressed in Escherichia coli, neither of the protein products contained a bound flavin, whereas they both had a high activity of flavin reductase, one preferentially utilizing NADH and the other NADPH.
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