Significant rewiring of the transcriptome and proteome of an Escherichia coli strain harboring a tailored exogenous global regulator IrrE

• Published in: PloS one Vol. 7; no. 7; p. e37126
• Main Authors: Chen, Tingjian, Wang, Jianqing, Zeng, Lingli, Li, Rizong, Li, Jicong, Chen, Yilu, Lin, Zhanglin
• Format: Journal Article
• Language: English
• Published: United States Public Library of Science 05.07.2012; Public Library of Science (PLoS)
• Subjects: Bacteria; Bacterial Proteins - genetics; Bacterial Proteins - metabolism; Biodiesel fuels; Biological Transport; Biology; Biosynthesis; Catalysis; Cell walls; Chemical engineering; Clostridium; Comparative analysis; Complexity; Deoxyribonucleic acid; DNA; DNA binding proteins; DNA repair; DNA-directed RNA polymerase; E coli; Escherichia coli; Escherichia coli - drug effects; Escherichia coli - genetics; Escherichia coli - metabolism; Ethanol; Fluidity; Gene expression; Gene Expression Profiling; Gene Expression Regulation, Bacterial; Genes; Genetic aspects; Genomes; Glycerol - pharmacology; Industrial strains; Ion Transport; Mass spectrometry; Membrane fluidity; Metabolism; Metabolites; Microorganisms; Mutants; Nitrates - metabolism; Nitric oxide; Nitric Oxide - metabolism; Nitrites - metabolism; Oxidation-Reduction; Phosphorylation; Proteins; Proteome; Proteomics; Radiation; Radiation tolerance; Reactive Oxygen Species - metabolism; Regulators; Ribonucleic acid; Ribosomes - metabolism; RNA; RNA polymerase; Scientific imaging; Signal Transduction; Strains (organisms); Stress, Physiological; Systems analysis; Temperature; Temperature tolerance; Tolerances; Transcription (Genetics); Transcription factors; Transcriptome; Tryptophan - metabolism; Beijing China; United States > US; China; Massachusetts
• ISSN: 1932-6203; 1932-6203
• DOI: 10.1371/journal.pone.0037126

Cell reprogramming for microorganisms via engineered or artificial transcription factors and RNA polymerase mutants has presented a powerful tool for eliciting complex traits that are practically useful particularly for industrial strains, and for understanding at the global level the regulatory network of gene transcription. We previously further showed that an exogenous global regulator IrrE (derived from the extreme radiation-resistant bacterium Deinococcus radiodurans) can be tailored to confer Escherichia coli (E. coli) with significantly enhanced tolerances to different stresses. In this work, based on comparative transcriptomic and proteomic analyses of the representative strains E1 and E0, harboring the ethanol-tolerant IrrE mutant E1 and the ethanol-intolerant wild type IrrE, respectively, we found that the transcriptome and proteome of E. coli were extensively rewired by the tailored IrrE protein. Overall, 1196 genes (or approximately 27% of E. coli genes) were significantly altered at the transcriptomic level, including notably genes in the nitrate-nitrite-nitric oxide (NO) pathway, and genes for non-coding RNAs. The proteomic profile revealed significant up- or downregulation of several proteins associated with syntheses of the cell membrane and cell wall. Analyses of the intracellular NO level and cell growth under reduced temperature supported a close correlation between NO and ethanol tolerance, and also suggests a role for membrane fluidity. The significantly different omic profiles of strain E1 indicate that IrrE functions as a global regulator in E. coli, and that IrrE may be evolved for other cellular tolerances. In this sense, it will provide synthetic biology with a practical and evolvable regulatory "part" that operates at a higher level of complexity than local regulators. This work also suggests a possibility of introducing and engineering other exogenous global regulators to rewire the genomes of microorganism cells.