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Quantitative proteome of Shewanella oneidensis MR-1

ABSTRACT: We investigated the anode-specific responses of Shewanella oneidensis MR-1, an exoelectroactive ammaproteobacterium, using for the first time iTRAQ and 2D-LC MS/MS driven membrane proteomics to compare protein abundances in S. oneidensis when generating power in MFCs, and growing in a continuous culture.

INSTRUMENT(S): QSTAR

ORGANISM(S): Shewanella Oneidensis (strain Mr-1)

TISSUE(S): Electrically Active Cell

SUBMITTER: Trong Khoa Pham

LAB HEAD: Trong Khoa Pham

PROVIDER: PXD004090 | Pride | 2016-12-08

REPOSITORIES: Pride

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An iTRAQ characterisation of the role of TolC during electron transfer from Shewanella oneidensis MR-1.

Fowler Gregory J S GJ Pereira-Medrano Ana G AG Jaffe Stephen S Pasternak Grzegorz G Pham Trong Khoa TK Ledezma Pablo P Hall Simon T E ST Ieropoulos Ioannis A IA Wright Phillip C PC

Proteomics 20161018 21

Anodophilic bacteria have the ability to generate electricity in microbial fuel cells (MFCs) by extracellular electron transfer to the anode. We investigated the anode-specific responses of Shewanella oneidensis MR-1, an exoelectroactive Gammaproteobacterium, using for the first time iTRAQ and 2D-LC MS/MS driven membrane proteomics to compare protein abundances in S. oneidensis when generating power in MFCs, and growing in a continuous culture. The regulated dataset produced was enriched in memb ...[more]

PMID: 27599463

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Comparison of gene expression and mutant fitness in Shewanella oneidensis MR-1

Project description:Comparison of gene expression and mutant fitness in Shewanella oneidensis MR-1 Expression data for 15 growth conditions in mid-exponential phase and expression data across growth phases for 3 of those conditions

2012-07-18 | E-GEOD-39462 | biostudies-arrayexpress

Expression data from Shewanella oneidensis MR-1 in time series experiment

Project description:The sumitted data compares gene expression profile of Shewnaella oneidensis MR-1 on two different sets of media conditions (nutritionally rich LB medium and Lactate minimal medium) To explore the effect of various growth phases in Shewanella oneidensis MR-1, the genome-wide transcriptome profiles growth in two sets media was compared to each other. Strain was grown in chemostat at 20% O2 in batch culture. Samples were collected in duplicate from both experiments.

2012-04-30 | E-GEOD-25821 | biostudies-arrayexpress

Comparison of gene expression and mutant fitness in Shewanella oneidensis MR-1

Project description:Comparison of gene expression and mutant fitness in Shewanella oneidensis MR-1

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dRNA-seq of Shewanella oneidensis MR-1

Project description:We combined high-resolution tiling microarrays and 5'-end RNA sequencing to obtain a genome-wide map of transcription start sites (TSSs) for Shewanella oneidensis MR-1. To test the reliability of these TSSs, we compared our result to those from differential RNA sequencing (dRNA-seq), which discriminates primary and processed ends of transcripts. We found that our identified TSSs tend to have significantly more mapped reads in the TEX(+) sample than the TEX(-) sample. Overall, the dRNA-seq results support the validity of our predictions for TSS. S. oneidensis MR-1 was grown to mid-log phase in Luria-Bertani broth (LB) or defined lactate minimal medium, and total RNA was isolated and used for differential RNA-sequencing (dRNA-seq) by next-generation sequencing, which is used to verify genome-wide transcription start sites. For dRNA-seq, total RNA was partially treated with Terminator Exonuclease (TEX) to digest processed RNA and thereby enrich for primary transcript ends.

2014-06-12 | E-GEOD-58292 | biostudies-arrayexpress

Comparative transcriptome analysis of Shewanella MR-1 under oxic vs. suboxic conditions

Project description:To understand how cell physiological state affects mRNA translation, we used the bacterium Shewanella oneidensis MR-1 grown under steady state conditions at either 20% or 8.5% O2. Using a combination of quantitative proteomics and RNA-Seq, we generated high-confidence data on >1000 mRNA and protein pairs. By using a steady state model, we found that differences in protein–mRNA ratios were primarily due to differences in the translational efficiency of specific genes. When oxygen levels were lowered, 28% of the proteins showed at least a 2-fold change in expression. Transcription levels were significantly altered for 26% of the protein changes; translational efficiency was significantly altered for 46% and a combination of both was responsible for the remaining 28%. Changes in translational efficiency were significantly correlated with the codon usage pattern of the genes and measurable tRNA pools changed in response to altered O2 levels. Our results suggest that changes in the translational efficiency of proteins, in part due to altered tRNA pools, is a major determinant of regulated alterations in protein expression levels in bacteria. For further details, see the resulting publication and its supplemental material: Taylor, R. C. et al., "Changes in translational efficiency is a dominant regulatory mechanism in the environmental response of bacteria", Integrative Biology, 2013, 5, 1393. DOI: 10.1039/c3ib40120k mRNA profiles of Shewanella MR-1 were generated by sequencing on SOLID sequencers under high (20%) or low (8.5%) oxygen, with primary sample comparison pair in triplicate, other samples in duplicate.

2015-01-16 | E-GEOD-65062 | biostudies-arrayexpress

Shewanella oneidensis MR-1 etrA deletion mutant strain expression profiling determines fine-tuning regulatory role in anaerobic metabolism

Project description:Comparisson of expression profiling of a etrA deletion mutant strain (experimental sample) with that of the wild type Shewanella oneidensis MR-1 strain to assess global direct/indirect genetic regulation EtrA in Shewanella oneidensis MR-1 shares 73.6% and 50.8% amino acid sequence identity with the oxygen-sensing regulator Fnr in E. coli and Anr in Pseudomonas aeruginosa, respectively; however, its regulatory role of anaerobic metabolism in Shewanella spp. is complex and not well understood. Whole-genome expression profiling using a etrA gene deletion mutant as the experimental sample and the wild type strain as the reference, determine that EtrA fine-tunes the expression of genes involved in various anaerobic metabolic pathways, including nitrate, fumarate and dimethyl sulfoxide reduction. Moreover, genes involved in prophage activation and and genes implicated in aerobic metabolism were also differentially expressed. In contrast to previous studies that attributed a minor regulatory role to EtrA in Shewanella spp., this study demonstrates that EtrA acts as a global transcriptional regulator and cofers physiological advantages to the strain under certain growth conditions.

2011-01-29 | GSE26935 | GEO

Expression analysis of Shewanellla oneidensis MR-1 to Fe nanoparticle decorated anodes in microbial electrolysis cells

Project description:Investigation of whole genome gene expression level changes in a Shewanella oneidensis MR-1 to Fe nanoparticle decorated anodes, compared to the carbon plate anodes in microbial electrolysis cells. Whole genome microarray analysis of the gene expression showed that the encoding biofilm formation genes were significantly up-regulated as response to nanoparticle decorated anodes which indicated thickness improvements contributed to enhance current density. The increased expression genes related to nanowire, flavins and c-type cytochromes also have partially contributed to enhance current density by Fe nanoparticle decorated anode. The majority of additional differentially expressed genes associated with electron transport, anaerobic metabolism in response to the nanostructured anodes possibly play roles in current density enhancement. A six chip study using total RNA recovered from three separate replicates of biofilm on Fe Nanoparticle decorated anode of Shewanella oneidensis MR-1 and three separate replicates of carbon plate control. Each chip measures the expression level of 4,295 genes .

2011-08-19 | E-GEOD-31535 | biostudies-arrayexpress

Transcriptional targets of Shewanella oneidensis HnoC (SO_2540)

Project description:To identify the transcriptional targets of the DNA-binding response regulator HnoC (SO_2540), mRNA transcript levels in Shewanella oneidensis were measured using whole genome microarray analysis. Transcript levels were compared between WT Shewanella oneidensis and a hnoC deletion strain.

2013-11-01 | GSE44689 | GEO

Transcriptome profiling of cells initially attached to different surfaces

Project description:Initial attachment to a surface marks the onset of a bacterial life style switch from planktonic to biofilm mode of growth. Among dissimilatory iron reducing bacteria, S. oneidensis MR-1 is notable due to its extensive respiratory versatility. It has been hypothesized that direct interaction of Shewanella cells with, or close proximity to, an appropriate surface facilitates the deposition of electrons. In fact, Shewanella species have been demonstrated to adhere to various surfaces and form biofilms. Global transcriptome profiling was performed on cells in the transition to surface-associated growth using different surfaces and conditions to understand molecular mechanisms underlying the initiation of microbe-surface interactions and the switch from planktonic to sessile life style. In the study presented, expression profiles of two independent replicates of Shewanella oneidensis MR-1 wild type cells attached to glass for 0.25 h and 1 h, respectively, under hydrodynamic conditions were compared to two independent replicates of planktonic grown Shewanella oneidensis MR-1 wild type cells. Furthermore, expression profiles of two independent replicates of Shewanella oneidensis MR-1 wild type cells attached for 1 h to iron surface under hydrodynamic conditions were compared to two independent replicates of Shewanella oneidensis MR-1 wild type cells attached to glass for 1 h. All samples were obtained from aerobically grown cells in LM.

2010-12-07 | E-GEOD-25865 | biostudies-arrayexpress

Use of SWATH mass spectrometry for quantitative proteomic investigation of Shewanella oneidensis MR-1 biofilms grown on graphite cloth electrodes

Project description:. In this study we show successful use of SWATH-MS for quantitative proteomic analysis of a microbial electrochemically active biofilm. Shewanella oneidensis MR-1 was grown on carbon cloth electrodes under continuous anodic electrochemical polarizations in a bioelectrochemical system. Using lactate as the electron donor, anodes serving as terminal microbial electron acceptors were operated at three different electrode potentials (+0.71V, +0.21V & -0.19V vs. SHE) and the development of catalytic activity was monitored by measuring the current traces over time. Once maximum current was reached (usually within 21-29 hours) the electrochemical systems were shut off and biofilm proteins were extracted from the electrodes for proteomic assessment.

2016-08-10 | PXD001472 | Pride

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