Unknown,Transcriptomics,Genomics,Proteomics

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RNA expression for ethanologenic E coli strains LY180, EMFR9 and EMFR35 in the absence and presence of 5mM and 15 mM furfural for 15 min

ABSTRACT: The data explore the transcriptional response of strains LY180 and EMFR9 to 5 mM furfural under anaerobic fermentation condition The data explore the transcriptional response of strains LY180 and EMFR35 to 15 mM furfural under anaerobic fermentation condition The expression differences of polyamine transporters in LY180 vs EMFR9 and EMFR35 are further described in RD Geddes,X Wang, LP Yomano, EN Miller, H Zheng, KT Shanmugam, and LO Ingram. 2013. Selected Polyamines and Polyamine Transporters Increase Furfural Tolerance (in preparation for submission to Appl Env Microbiol) Total RNA was prepared from cultures of LY180, EMFR9 and EMFR35 immediately before and 15 min after addition of furfural (5mM and 15 mM). The Nimblegen TI83333 chip measures expression of 4,237 genes, with 5 replicates, and 18 probes average per gene. The complete dataset comprising 8 samples is linked below as a supplementary file.

ORGANISM(S): Escherichia coli B

SUBMITTER: Ryan Geddes

PROVIDER: E-GEOD-46442 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:Anaerobic benzene oxidation coupled to the reduction of Fe(III) was studied in Ferroglobus placidus in order to learn more about how such a stable molecule could be metabolized under strict anaerobic conditions. F. placidus conserved energy to support growth at 85°C in a medium with benzene provided as the sole electron donor and Fe(III) as the sole electron acceptor. The stoichiometry of benzene loss and Fe(III) reduction, as well as the conversion of [14C]-benzene to [14C]-carbon dioxide, was consistent with complete oxidation of benzene to carbon dioxide with electron transfer to Fe(III). Benzoate, but not phenol or toluene, accumulated at low levels during benzene metabolism and [14C]-benzoate was produced from [14C]-benzene. Analysis of gene transcript levels revealed increased expression of genes encoding enzymes for anaerobic benzoate degradation during growth on benzene versus growth on acetate, but genes involved in phenol degradation were not up-regulated during growth on benzene. A gene for a putative carboxylase that was more highly expressed in benzene- versus benzoate-grown cells was identified. These results suggest that benzene is carboxylated to benzoate and that phenol is not an important intermediate in the benzene metabolism of F. placidus. This is the first demonstration of a microorganism in pure culture that can grow on benzene under strict anaerobic conditions and for which there is strong evidence for degradation of benzene via clearly defined anaerobic metabolic pathways. Thus, F. placidus provides a much needed pure culture model for further studies on the anaerobic activation of benzene in microorganisms. A five-chip study using total RNA recovered from three separate cultures of Ferroglobus placidus DSM 10642 grown with 0.5 mM phenol (experimental condition) and two separate cultures of Ferroglobus placidus DSM 10642 grown on 1 mM benzoate (control condition). Each chip measures the expression level of 2,613 genes from Ferroglobus placidus DSM 10642 with nine 45-60-mer probe pairs (PM/MM) per gene, with three-fold technical redundancy.

Project description:Anaerobic benzene oxidation coupled to the reduction of Fe(III) was studied in Ferroglobus placidus in order to learn more about how such a stable molecule could be metabolized under strict anaerobic conditions. F. placidus conserved energy to support growth at 85°C in a medium with benzene provided as the sole electron donor and Fe(III) as the sole electron acceptor. The stoichiometry of benzene loss and Fe(III) reduction, as well as the conversion of [14C]-benzene to [14C]-carbon dioxide, was consistent with complete oxidation of benzene to carbon dioxide with electron transfer to Fe(III). Benzoate, but not phenol or toluene, accumulated at low levels during benzene metabolism and [14C]-benzoate was produced from [14C]-benzene. Analysis of gene transcript levels revealed increased expression of genes encoding enzymes for anaerobic benzoate degradation during growth on benzene versus growth on acetate, but genes involved in phenol degradation were not up-regulated during growth on benzene. A gene for a putative carboxylase that was more highly expressed in benzene- versus benzoate-grown cells was identified. These results suggest that benzene is carboxylated to benzoate and that phenol is not an important intermediate in the benzene metabolism of F. placidus. This is the first demonstration of a microorganism in pure culture that can grow on benzene under strict anaerobic conditions and for which there is strong evidence for degradation of benzene via clearly defined anaerobic metabolic pathways. Thus, F. placidus provides a much needed pure culture model for further studies on the anaerobic activation of benzene in microorganisms. A six-chip study using total RNA recovered from three separate cultures of Ferroglobus placidus DSM 10642 grown with 1 mM benzene (experimental condition) and three separate cultures of Ferroglobus placidus DSM 10642 grown on 0.5 mM phenol (control condition). Each chip measures the expression level of 2,613 genes from Ferroglobus placidus DSM 10642 with nine 45-60-mer probe pairs (PM/MM) per gene, with three-fold technical redundancy.

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Dataset Information

RNA expression for ethanologenic E coli strains LY180, EMFR9 and EMFR35 in the absence and presence of 5mM and 15 mM furfural for 15 min

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