Dataset Information

Comparative Proteomics Analysis Reveals Unique Early Signaling Response of Saccharomyces cerevisiae to Oxidants with Different Mechanism of Action Prajita Pandey 1,‡, Khadiza Zaman 2, ‡, Laszlo Prokai 2 , and Vladimir Shulaev 1,*

ABSTRACT: The early signaling events involved in oxidant recognition and triggering of oxidant-specific defense mechanisms to counteract oxidative stress still remains largely elusive. Our discovery driven comparative proteomics analysis revealed unique early signaling response of yeast Saccharomyces cerevisiae on proteome level to oxidants with different mechanism of action as early as 3 min after treatment with four oxidants, namely H2O2, cumene hydroperoxide (CHP), menadione and diamide, when protein abundances were compared using label-free quantification relying on a high-resolution mass analyzer (Orbitrap). We identified significant regulation of 196 proteins in response to H2O2, 569 proteins in response to CHP, 369 proteins in response to menadione and 207 proteins in response to diamide. Only 17 proteins were common across all treatments, but several more proteins were shared between two or three oxidants. Pathway analyses revealed that each oxidant triggered unique signaling mechanism associated with cell survival and repair. Signaling pathways mostly regulated by oxidants were Ran, mTOR, Rho, and eIEF2. Furthermore, each oxidant regulated these pathways in a unique way indicating specificity of response to oxidants having different mode of action. We hypothesize that interplay of these signaling pathway may be important in recognizing different oxidants to trigger different downstream MAPK signaling cascades and induce specific responses.

INSTRUMENT(S): LTQ Orbitrap Velos

ORGANISM(S): Saccharomyces Cerevisiae (baker's Yeast)

SUBMITTER: Laszlo Prokai

LAB HEAD: Dr. Vladimir Shulaev

PROVIDER: PXD022685 | Pride | 2021-01-04

REPOSITORIES: Pride

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			Action	DRS
	20200517_Yeast_CDMSO_R1_.msf	Msf
	20200517_Yeast_CDMSO_R1_01a.raw	Raw
	20200517_Yeast_CDMSO_R1_02a.raw	Raw
	20200517_Yeast_CDMSO_R1_03a.raw	Raw
	20200517_Yeast_CDMSO_R1_04a.raw	Raw

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Comparative Proteomics Analysis Reveals Unique Early Signaling Response of Saccharomyces cerevisiae to Oxidants with Different Mechanism of Action.

Pandey Prajita P Zaman Khadiza K Prokai Laszlo L Shulaev Vladimir V

International journal of molecular sciences 20201226 1

The early signaling events involved in oxidant recognition and triggering of oxidant-specific defense mechanisms to counteract oxidative stress still remain largely elusive. Our discovery driven comparative proteomics analysis revealed unique early signaling response of the yeast Saccharomyces cerevisiae on the proteome level to oxidants with a different mechanism of action as early as 3 min after treatment with four oxidants, namely H2O2, cumene hydroperoxide (CHP), ...[more]

PMID: 33375274

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Project description:Background: During gut colonization, the enteric pathogen C. jejuni has to surmount the toxic effects of reactive oxygen species produced by its own metabolism, by the host immune system and by the intestinal microflora. Elucidation of C. jejuni oxidative stress defense mechanisms is critical for understanding Campylobacter pathophysiology. Results: The mechanisms of oxidative stress defenses in Campylobacter jejuni were characterized by transcriptional profiling, genes mutagenesis, and phenotypic analysis. The transcriptome changes, in response to H2O2, cumene hydroperoxide, or menadione exposure, were found to be oxidant specific and revealed the differential expression of genes belonging to a variety of biological pathways, from the classical oxidative stress defense systems, to the heat shock response, DNA repair and metabolism, fatty acid and capsule biosynthesis, and multidrug efflux pumps. To define the peroxide sensing regulator PerR, an isogenic mutant was constructed and its transcriptome profile compared to the wild-type strain. Sixty-six genes were found to belong to the PerR regulon. PerR appear to regulate gene expression both dependently and independently of the presence of iron and/or H2O2. The perR mutant was affected in its motility and attenuated in the chick colonization model. Mutagenic and phenotypic studies of the superoxide disumutase SodB, the alkyl-hydroxyperoxidase AhpC, and the catalase KatA, revealed their role in oxidative stress defenses and chick gut colonization. Conclusion: This study reveals the interplay between PerR, the iron metabolism and the oxidative stress defenses and highlights their role in the colonization and/or survival of C. jejuni in the chick cecum. Keywords: Transcriptional response to 3 oxidants (H2O2, menadione and cumene hydroperoxide) and characterization of the perR regulon (comparison of the transciptomes from the wild-type and perR mutant). To investigate the transcriptional responses of C. jejuni to oxidant exposure, hydrogen peroxide (H2O2), cumene hydroperoxide (CHP), or menadione sodium bisulfite (MND) was added to the 50 ml broth at a final concentration of 1 mM. The same amount of water or DMSO was added to the bacterial culture that served as reference samples for the transcriptional profile study in response to H2O2, MND or CHP. Furthermore, to investigate the transcriptional response of C. jejuni to H2O2 exposure in the presence of excess iron, ferrous sulfate was added to the bacterial culture at a final concentration of 40 µM, 15 min prior to H2O2 exposure. Ten minutes after the addition of the oxidant, total RNA was extracted and processed for microarray hybridization. To identify the PerR regulon, the wild-type strain C. jejuni NCTC 11168 and the perR mutant were grown in 500 ml flasks containing 250 ml of MEMα medium. At mid-log phase, 50 ml of the cultures were transferred to 100 ml flasks and ferrous sulfate and/or H2O2 were added . Ten minutes following the addition of H2O2 the cells were collected and the total RNA extracted.

Dataset Information

Comparative Proteomics Analysis Reveals Unique Early Signaling Response of Saccharomyces cerevisiae to Oxidants with Different Mechanism of Action Prajita Pandey 1,‡, Khadiza Zaman 2, ‡, Laszlo Prokai 2 , and Vladimir Shulaev 1,*

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Publications

Comparative Proteomics Analysis Reveals Unique Early Signaling Response of <i>Saccharomyces cerevisiae</i> to Oxidants with Different Mechanism of Action.

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