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首页> 外文期刊>Molecular Microbiology >Extracellular signalling, translational control, two repressors and an activator all contribute to the regulation of methylenomycin production in Streptomyces coelicolor.
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Extracellular signalling, translational control, two repressors and an activator all contribute to the regulation of methylenomycin production in Streptomyces coelicolor.

机译:细胞外信号转导,翻译控制,两个阻遏物和一个激活物都有助于调节天蓝色链霉菌中甲基霉素的产生。

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摘要

Bioinformatic analysis of the plasmid-linked gene cluster associated with biosynthesis of methylenomycin (Mm) suggested that part of the cluster directs synthesis of a gamma-butyrolactone-like autoregulator. Autoregulator activity could be extracted from culture fluids, but differed from gamma-butyrolactones in being alkali resistant. The activity has recently been shown to comprise a series of novel autoregulator molecules, the methylenomycin furans (termed MMF). MMF autoregulator activity is shown to account for the ability of certain Mm non-producing mutants to act as 'secretors' in cosynthesis with other 'convertor' mutants. Three genes implicated in MMF biosynthesis are flanked by two regulatory genes, which are related to genes for gamma-butyrolactone-binding proteins. Genetic evidence suggests that these two genes encode components of a hetero-oligomeric repressor of MMF and Mm biosynthesis. The Mm biosynthetic genes themselves depend on the activator gene mmyB, which appears to be repressed by the putative MmyR/MmfR complex until enough MMF accumulates to release repression. The presence of TTA codons in mmyB and the main MMF biosynthetic gene causes Mm production to be dependent on the pleiotropically acting bldA gene, which encodes the tRNA for the rarely used UUA codon.
机译:与甲基霉素(Mm)的生物合成有关的质粒连锁基因簇的生物信息学分析表明,该簇的一部分指导了类似γ-丁内酯的自动调节剂的合成。可以从培养液中提取自动调节剂的活性,但与γ-丁内酯的不同之处在于具有抗碱性。最近显示该活性包含一系列新的自调节分子,即甲基新霉素呋喃(称为MMF)。 MMF自动调节剂的活性被证明可解释某些Mm非产生突变体与其他“转化子”突变体共合成“分泌物”的能力。与MMF生物合成有关的三个基因的两侧是两个调节基因,它们与γ-丁内酯结合蛋白的基因有关。遗传证据表明,这两个基因编码MMF和Mm生物合成的异源寡聚阻遏物的成分。 Mm生物合成基因本身依赖于激活基因mmyB,该基因似乎被推定的MmyR / MmfR复合物抑制,直到积累足够的MMF释放抑制。 mmyB和主要的MMF生物合成基因中存在TTA密码子,导致Mm的产生取决于多效性作用的bldA基因,该基因编码很少使用的UUA密码子的tRNA。

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