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首页> 外文期刊>Molecular Microbiology >Characterization of the multiple molecular mechanisms underlying RsaL control of phenazine-1-carboxylic acid biosynthesis in the rhizosphere bacterium Pseudomonas aeruginosa PA1201
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Characterization of the multiple molecular mechanisms underlying RsaL control of phenazine-1-carboxylic acid biosynthesis in the rhizosphere bacterium Pseudomonas aeruginosa PA1201

机译:根际菌苯吡吡吡吡吡吡吡吡吡喃酮铜酮铜酮铜酮铜酮铜酮铜酮类铜绿素铜绿假单胞菌PA1201的表征

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摘要

Phenazines are important secondary metabolites that have been found to affect a broad spectrum of organisms. Two almost identical gene clusters phz1 and phz2 are responsible for phenazines biosynthesis inthe rhizobacterium Pseudomonas aeruginosa PA1201. Here, we show that the transcriptional regulator RsaL is a potent repressor of phenazine-1-carboxylic acid (PCA) biosynthesis. RsaL negatively regulates phz1 expression and positively regulates phz2 expression via multiple mechanisms. First, RsaL binds to a 25-bp DNA region within the phz1 promoter to directly repress phz1 expression. Second, RsaL indirectly regulates the expression of both phz clusters by decreasing the activity of the las and pqs quorum sensing (QS) systems, and by promoting the rhl QS system. Finally, RsaL represses phz1 expression through the downstream transcriptional regulator CdpR. RsaL directly binds to the promoter region of cdpR to positively regulate its expression, and subsequently CdpR regulates phz1 expression in a negative manner. We also show that RsaL represents a new mechanism for the turnover of the QS signal molecule N-3-oxododecanoyl-homoserine lactone (3-oxo-C12-HSL). Overall, this study elucidates RsaL control of phenazines biosynthesis and indicates that a PA1201 strain harboring deletions in both the rsaL and cdpR genes could be used to improve the industrial production of PCA.
机译:发现的是已经发现影响广谱的生物体的重要次生代谢产物。两个几乎相同的基因簇pHz1和phz2是对苯嗪生物合成的负责性,铜绿假单胞菌铜绿假单胞菌PA1201。在这里,我们表明转录调节器RSAL是苯吡啶-1-羧酸(PCA)生物合成的有效阻遏物。 RSAL负调节PHZ1表达,并通过多种机制呈正调节PHZ2表达。首先,RSAL与PHZ1启动子内的25-BP DNA区域结合,直接抑制PHZ1表达。其次,RSAL通过降低LAS和PQS Quorum感测(QS)系统的活动,并通过促进RHL QS系统来间接调节两种PHZ簇的表达。最后,RSAL通过下游转录调节器CDPR压制PHZ1表达。 RSAL直接与CDPR的启动子区域结合,以积极调节其表达,随后CDPR以负面方式调节PHZ1表达。我们还表明RSAL表示QS信号分子N-3-氧代二甲酰基 - 甲酰胺内酯(3-氧代-C12-HSL)的成交量的新机制。总体而言,本研究阐明了苯酶生物合成的RSAL控制,并表明可以使用在RSAL和CDPR基因中缺失缺失的PA1201菌株来改善PCA的工业生产。

著录项

  • 来源
    《Molecular Microbiology》 |2017年第6期|共17页
  • 作者单位

    Shanghai Jiao Tong Univ Sch Life Sci &

    Biotechnol State Key Lab Microbial Metab Shanghai 200240;

    Shanghai Jiao Tong Univ Sch Life Sci &

    Biotechnol State Key Lab Microbial Metab Shanghai 200240;

    Shanghai Jiao Tong Univ Sch Life Sci &

    Biotechnol State Key Lab Microbial Metab Shanghai 200240;

    Shanghai Jiao Tong Univ Sch Life Sci &

    Biotechnol State Key Lab Microbial Metab Shanghai 200240;

    Shanghai Jiao Tong Univ Sch Life Sci &

    Biotechnol State Key Lab Microbial Metab Shanghai 200240;

    King Mongkuts Inst Technol Ladkrabang Fac Sci Dept Biol Bangkok Thailand;

    Univ Roma Tre Dept Sci Rome Italy;

    Shanghai Jiao Tong Univ Sch Life Sci &

    Biotechnol State Key Lab Microbial Metab Shanghai 200240;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 细胞生物学;
  • 关键词

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