Regulation of dndB Gene Expression in Streptomyces lividans.

Regulation of dndB Gene Expression in Streptomyces lividans.
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浅青紫链霉菌中 dndB 基因表达的调控

DOI:
10.3389/fmicb.2018.02387
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发表时间:
2018
影响因子:
5.2
通讯作者:
Tang A
Tang A
中科院分区:
生物学2区
文献类型:
--
作者:
Dai D;Pu T;Liang J;Wang Z;Tang A

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DNA硫修饰是一种发生在DNA糖 - 磷酸骨架上的独特修饰,其中一个非桥连氧原子以序列特异性和Rp立体特异性的方式被硫取代。生物信息学、RNA - seq以及体外转录分析表明,DNA硫修饰可能参与表观遗传调控。然而,支持这一论断的体内证据并不令人信服。在此,我们旨在对变铅青链霉菌dndB启动子区域附近的两个硫修饰位点进行表征。任一位点的单突变对dndB转录均无影响,而两个位点的双突变则显著提高了dndB的表达。这些发现表明DNA硫修饰影响基因表达,并且DNA硫修饰在表观遗传调控中的作用取决于硫修饰位点的数量。我们还鉴定出一个反向重复序列,即R重复序列,并表明该序列参与了dndB基因表达的正调控。
DNA sulfur modification is a unique modification occurring in the sugar-phosphate backbone of DNA, with a nonbridging oxygen atom substituted with sulfur in a sequence-specific and Rp stereo-specific manner. Bioinformatics, RNA-seq, and in vitro transcriptional analyses have shown that DNA sulfur modification may be involved in epigenetic regulation. However, the in vivo evidence supporting this assertion is not convincing. Here, we aimed to characterize two sulfur-modified sites near the dndB promoter region in Streptomyces lividans. Single mutation of either site had no effect on dndB transcription, whereas double mutation of both sites significantly elevated dndB expression. These findings suggested that DNA sulfur modification affected gene expression, and the role of DNA sulfur modification in epigenetic regulation depended on the number of sulfur-modified sites. We also identified an inverted repeat, the R repeat sequence, and showed that this sequence participated in the positive regulation of dndB gene expression.
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