論文 - 詳細
| RRC ID | 6934 |
|---|---|
| 著者 | Horinouchi T, Tamaoka K, Furusawa C, Ono N, Suzuki S, Hirasawa T, Yomo T, Shimizu H. |
| タイトル | Transcriptome analysis of parallel-evolved Escherichia coli strains under ethanol stress. |
| ジャーナル | BMC Genomics |
| Abstract |
BACKGROUND:Understanding ethanol tolerance in microorganisms is important for the improvement of bioethanol production. Hence, we performed parallel-evolution experiments using Escherichia coli cells under ethanol stress to determine the phenotypic changes necessary for ethanol tolerance. RESULTS:After cultivation of 1,000 generations under 5% ethanol stress, we obtained 6 ethanol-tolerant strains that showed an approximately 2-fold increase in their specific growth rate in comparison with their ancestor. Expression analysis using microarrays revealed that common expression changes occurred during the adaptive evolution to the ethanol stress environment. Biosynthetic pathways of amino acids, including tryptophan, histidine, and branched-chain amino acids, were commonly up-regulated in the tolerant strains, suggesting that activating these pathways is involved in the development of ethanol tolerance. In support of this hypothesis, supplementation of isoleucine, tryptophan, and histidine to the culture medium increased the specific growth rate under ethanol stress. Furthermore, genes related to iron ion metabolism were commonly up-regulated in the tolerant strains, which suggests the change in intracellular redox state during adaptive evolution. CONCLUSIONS:The common phenotypic changes in the ethanol-tolerant strains we identified could provide a fundamental basis for designing ethanol-tolerant strains for industrial purposes. |
| 巻・号 | 11 |
| ページ | 579 |
| 公開日 | 2010-10-19 |
| DOI | 10.1186/1471-2164-11-579 |
| PII | 1471-2164-11-579 |
| PMID | 20955615 |
| PMC | PMC3091726 |
| MeSH | Adaptation, Physiological / drug effects Adaptation, Physiological / genetics Amino Acids / pharmacology Directed Molecular Evolution* Escherichia coli / drug effects* Escherichia coli / genetics* Escherichia coli / growth & development Ethanol / toxicity* Gene Expression Profiling* Gene Expression Regulation, Bacterial / drug effects* Genes, Bacterial / genetics Ions Iron / pharmacology Principal Component Analysis Regulon / genetics Stress, Physiological / drug effects Stress, Physiological / genetics* |
| IF | 3.594 |
| 引用数 | 81 |
| WOS 分野 | BIOTECHNOLOGY & APPLIED MICROBIOLOGY GENETICS & HEREDITY |
| リソース情報 | |
| 原核生物(大腸菌) | W3110 |