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首页> 外文期刊>Journal of bacteriology >An ATP-Grasp Ligase Involved in the Last Biosynthetic Step of the Iminomycosporine Shinorine in Nostoc punctiforme ATCC 29133
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An ATP-Grasp Ligase Involved in the Last Biosynthetic Step of the Iminomycosporine Shinorine in Nostoc punctiforme ATCC 29133

机译:一个ATP抓紧的连接酶参与点孢菌ATCC 29133中的小孢菌素丝氨酸的最后生物合成步骤。

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摘要

We investigated the genetic basis for mycosporine sunscreen biosynthesis by the cyanobacterium Nostoc punctiforme ATCC 29133. Heterologous expression in Escherichia coli of three contiguous N. punctiforme genes (NpR5600, NpR5599, and NpR5598, here named mysA, mysB, and mysC, respectively) led to the production of mycosporine-glycine, an oxomycosporine. Additional expression of gene NpF5597 (mysD) led to the conversion of mycosporine-glycine into iminomycosporines (preferentially shinorine but also others like mycosporine-2-glycine and porphyra-334). This represents a new mode of enzymatic synthesis for iminomycosporines, one that differs in genetic origin, mechanism, and apparent substrate specificity from that known in Anabaena variabilis ATCC 29413. These results add to the emerging profile of the protein family of ATP-dependent ligases, to which the mysC product belongs, as important condensation enzymes in microbial secondary metabolism.
机译:我们调查了蓝藻Nostoc punctiforme ATCC 29133霉菌素防晒剂生物合成的遗传基础。三个连续点状N.punctiforme基因(NpR5600,NpR5599和NpR5598在大​​肠杆菌中的异源表达,在这里称为 mys A mys B mys C )导致了霉菌素的产生,甘氨酸,一种草霉素。基因NpF5597( mys D )的额外表达导致霉菌素-甘氨酸转化为亚胺基香豆素(优选地为shinorine,但也像霉菌素-2-甘氨酸和porphyra-334) 。这代表了一种亚胺基香菜碱酶合成的新模式,这种模式在遗传起源,机制和明显的底物特异性上与鱼腥藻ATCC 29413中已知的不同。这些结果增加了ATP依赖性连接酶蛋白家族的新形象, mys C 产物属于微生物二次代谢中的重要缩合酶。

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