Genetic analysis of benzothiophene biodesulfurization pathway of Gordonia terrae strain C-6.

Genetic analysis of benzothiophene biodesulfurization pathway of Gordonia terrae strain C-6.
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大头茶菌株C-6苯并噻吩生物脱硫途径的遗传分析

DOI:
10.1371/journal.pone.0084386
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发表时间:
2013
期刊:
影响因子:
3.7
通讯作者:
Li G
Li G
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Wang W;Ma T;Lian K;Zhang Y;Tian H;Ji K;Li G

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一些细菌可以在不破坏碳-碳键的情况下从苯并噻吩中脱除硫。然而,到目前为止,还没有关于Bt脱硫的明确机理及其遗传成分的文献报道。在这项研究中,我们使用比较转录组学方法研究了以Bt或硫酸钠为唯一硫源培养的Gordia terrae C-6中基因的差异表达。我们发现,与硫酸钠作为唯一硫源相比,Bt上调了135个基因的表达。这些基因中的许多编码依赖于黄素的单加氧酶、烷基磺酸盐单加氧酶和脱硫酶,它们的功能与二苯并硫苯(DBT)生物脱硫4S途径中的那些相似。其中三个基因被发现位于同一个操纵子中,命名为bdsABC。PET28a-bdsABC的细胞抽提物转化大肠杆菌Rosetta(DE3),将Bt转化为酚类化合物,经鉴定为o-羟基苯乙烯。这些结果促进了我们对Bt生物脱硫途径中涉及的酶的理解。
Sulfur can be removed from benzothiophene (BT) by some bacteria without breaking carbon-carbon bonds. However, a clear mechanism for BT desulfurization and its genetic components have not been reported in literatures so far. In this study, we used comparative transcriptomics to study differential expression of genes in Gordonia terrae C-6 cultured with BT or sodium sulfate as the sole source of sulfur. We found that 135 genes were up-regulated with BT relative to sodium sulfate as the sole sulfur source. Many of these genes encode flavin-dependent monooxygenases, alkane sulfonate monooxygenases and desulfinase, which perform similar functions to those involved in the 4S pathway of dibenzothiophene (DBT) biodesulfurization. Three of the genes were found to be located in the same operon, designated bdsABC. Cell extracts of pET28a-bdsABC transfected E. coli Rosetta (DE3) converted BT to a phenolic compound, identified as o-hydroxystyrene. These results advance our understanding of enzymes involved in the BT biodesulfurization pathway.
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