Steroid degradation and two steroid-inducible enzymes in the marine bacterium H5
文献类型：期刊论文
| 作者 | Sang, Yingying ; Xiong, Guangming ; Maser, Edmund |
| 刊名 | CHEMICO-BIOLOGICAL INTERACTIONS
 |
| 出版日期 | 2011-05-30 |
| 卷号 | 191期号:40911页码:89—94 |
| 中文摘要 | Natural and and synthetic steroid hormones excreted into the environment are potentially threatening the population dynamics of all kinds of animals and public health. We have previously isolated a steroid degrading bacterial strain (H5) from the Baltic Sea. at Kiel, Germany. 16S-rRNA analysis showed that bacterial strain H5 belongs to the genus Vibrio, family Vibrionaceae and class Gamma-Proteobacteria. Bacterial strain H5 can degrade steroids such as testosterone and estrogens, which was shown in this study by determining the (3)H labeled steroid retaining in the bacterial H5 culture medium at incubation times of 5 h and 20 h. Since 3 alpha-hydroxysteroid dehydrogenase/carbonyl reductase (3 alpha-HSD/CR) is a key enzyme in adaptive steroid degradation in Comamonas testosteroni (C. testosteroni), in previous investigations, a meta-genomic system with the 3 alpha-HSD/CR gene as a positive control was established. By this meta-genomic system, two estradiol inducible genes coding 3-ketosteroid-delta-1-dehydrogenase and carboxylesterase, respectively, which are involved in steroid degradation, were found in marine strain H5. In the present work, the 3-ketosteroid-delta-1-dehydrogenase and carboxylesterase genes were subcloned into plasmids pET38-12 and pET24-17, respectively. Overexpression in Escherichia coli (E. coil) strain BL21(DE3)pLysS cells resulted in corresponding proteins with an N-terminal His-tag sequence. After induction with isopropyl-beta-D-thiogalactoside, 3-ketosteroid-delta-1-dehydrogenase and carboxylesterase were purified in one step using nickel-chelate chromatography. After protein determination, 3-ketosteroid-delta-1 -dehydrogenase (0.48 mg/ml) and carboxylesterase (1.28 mg/ml) were used to prepare antibodies to determine steroid binding specificity in future research. In summary, we have shown that the marine strain H5 could metabolize steroids: have isolated two estradiol inducible genes from strain H5 chromosomal DNA, and purified the corresponding proteins for further research. The exact characterization and systematic classification of the marine steroid degrading bacterial strain H5 is envisaged. The strain might be used for the bioremediation of steroid contaminations in seawater. (C) 2011 Elsevier Ireland Ltd. All rights reserved. |
| WOS记录号 | WOS:000291767200016 |
| 公开日期 | 2012-10-18 |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/7058]  |
| 专题 | 生态环境研究中心_城市与区域生态国家重点实验室 |
| 推荐引用方式 GB/T 7714 | Sang, Yingying,Xiong, Guangming,Maser, Edmund. Steroid degradation and two steroid-inducible enzymes in the marine bacterium H5[J]. CHEMICO-BIOLOGICAL INTERACTIONS,2011,191(40911):89—94. |
| APA | Sang, Yingying,Xiong, Guangming,&Maser, Edmund.(2011).Steroid degradation and two steroid-inducible enzymes in the marine bacterium H5.CHEMICO-BIOLOGICAL INTERACTIONS,191(40911),89—94. |
| MLA | Sang, Yingying,et al."Steroid degradation and two steroid-inducible enzymes in the marine bacterium H5".CHEMICO-BIOLOGICAL INTERACTIONS 191.40911(2011):89—94. |
入库方式： OAI收割
来源：生态环境研究中心
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