德氏假单胞R-8菌脱硫的"硫饥饿"诱导机理
Sulfur-starvation-induced Desulfurization Mechanism of Pseudomonas delafieldii R-8
查看参考文献14篇
文摘
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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Na_2SO_4(>0.023 mmol L~(-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(Na_2SO_4浓度≤0.023 mmol L~(-1))时,诱导了脱硫酶的合成,能利用DBT生长;Na_2SO_4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0.023 mmol L~(-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1参14 |
其他语种文摘
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Pseudomonas delafieldii R-8 can convert dibenzothiophene into 2-hydroxybiphenyl and sulfate. The desulfurization operon of strain R-8 was cloned into expressing plasmid (pPR9TT), and then reintroduced into strain R-8-0 to obtain engineering strain R-8-D. Strains R-8 and R-8-D were cultured in BSM medium with 0.2 mmol L~(-1) DBT and different concentrations of sulfate, and sulfur-starvation-induced desulfurization mechanism of R-8 was studied. The results showed that strain R-8 cultured in sufficient Na_2SO_4 (> 0.023 mmol L~(-1)) could grow and Na_2SO_4 be firstly used, but the synthesis of Dsz was repressed and DBT could not be used. On the contrary, DBT could be used and the synthesis of Dsz was induced at sulfur starvation (Na_2SO_4 concentration ≤ 0.023 mmol L~(-1)). The expression of dsz reporter gene lacZ in R-8-D was inhibited above the critical concentration of Na_2SO_4, but it was not below the critical concentration. The results verified the sulfur-starvation-induced mechanism of desulfurization by strain R-8 at the cellular and molecular levels, and for the first time identified biodesulfurization sulfur-starvation induced by the critical concentration of sulfate was 0.023 mmol L~(-1). These results are theoretically and technically helpful for the construction of highly active and reliable desulphurization engineering strains that will not be inhibited by sulfate. Fig 10, Tab 1, Ref 14 |
来源
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应用与环境生物学报
,2009,15(2):235-239 【核心库】
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DOI
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10.3724/sp.j.1145.2009.00235
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关键词
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德氏假单胞菌
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硫酸盐
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DBT
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"硫饥饿"诱导
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pPR9TT
;
脱硫基因
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地址
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1.
中国农业科学院研究生院生物化学与分子生物学实验室, 北京, 100081
2.
中国科学院过程工程研究所, 中国科学院绿色过程与工程重点实验室, 北京, 100080
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语种
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中文 |
文献类型
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研究性论文 |
ISSN
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1006-687X |
学科
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行业污染、废物处理与综合利用 |
基金
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国家高技术研究发展计划(863计划)
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文献收藏号
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CSCD:3737334
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参考文献 共
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共1页
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