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crosstalk between ros homeostasis and secondary metabolism in s. natalensis atcc 27448 modulation of pimaricin production by intracellular ros相声ros体内平衡和次生代谢之间写明atcc 27448 s natalensis调制通过细胞内ros匹马菌素的生产.pdf

发布:2017-09-09约11.58万字共12页下载文档
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Crosstalk between ROS Homeostasis and Secondary Metabolism in S. natalensis ATCC 27448: Modulation of Pimaricin Production by Intracellular ROS 1,2. ´ 1,3. 1 ´ 4 1,3 Tiago Beites , Sılvia D. S. Pires , Catarina L. Santos , Hugo Osorio , Pedro Moradas-Ferreira , Marta V. Mendes1* ˆ 1 IBMC – Instituto de Biologia Molecular e Celular, Universidade do Porto, Porto, Portugal, 2 Departamento de Biologia, Faculdade de Ciencias (FCUP), Universidade do ˆ ´ Porto, Porto, Portugal, 3 ICBAS – Instituto de Ciencias Biomedicas Abel Salazar, Universidade do Porto, Porto, Portugal, 4 IPATIMUP - Institute of Molecular Pathology and Immunology, University of Porto, Porto, Portugal Abstract Streptomyces secondary metabolism is strongly affected by oxygen availability. The increased culture aeration enhances pimaricin production in S. natalensis, however the excess of O2 consumption can lead to an intracellular ROS imbalance that is harmful to the cell. The adaptive physiological response of S. natalensis upon the addition of exogenous H O suggested 2 2 that the modulation of the intracellular ROS levels, through the activation of the H2O2 inducible catalase during the late exponential growth phase, can alter the production of pimaricin. With the construction of defective mutants on the H2O2
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