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德氏假单胞R-8菌脱硫的“硫饥饿”诱导机理
Authors
余志坚
李信
+4 more
李焕杰
李玉光
王海胜
闫艳春
Publication date
1 January 2009
Publisher
Abstract
以专一性脱硫菌德氏假单胞菌(Pseudomonas delafieldii)R-8为出发菌株,构建了含有重组质粒pRT-D的重组菌株R-8-D.在不同硫酸盐浓度条件下,研究了R-8和R-8-D脱硫的"硫饥饿"诱导机理,结果表明,在充足的Na2SO4(>0.023mmolL-1)条件下,R-8菌首先利用硫酸盐生长,脱硫酶的合成受阻遏,DBT不被利用,而R-8菌处于"硫饥饿"状态(Na2SO4浓度≤0.023mmolL-1)时,诱导了脱硫酶的合成,能利用DBT生长;Na2SO4在临界浓度以上时,R-8-D菌阻遏了脱硫基因的报告基因lacZ的表达,低于临界浓度时不抑制lacZ表达.本实验结果从细胞和分子水平上证实了R-8菌脱硫属"硫饥饿"诱导类型,并首次确定了脱硫微生物"硫饥饿"诱导的硫酸盐临界浓度为0.023mmolL-1,为构建高活性的、不受硫酸盐抑制的脱硫工程菌提供了理论依据和技术支持.图10表1参1
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Last time updated on 09/11/2016
Institutional Repository of Institute of Process Engineering, CAS (IPE-IR)
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oai:ir.ipe.ac.cn:122111/45634
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Institutional Repository of Institute of Process Engineering, CAS (IPE-IR)
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oai:ir.ipe.ac.cn:122111/33316
Last time updated on 05/12/2019