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首页> 外文期刊>Journal of bacteriology >Menaquinone (Vitamin K2) Biosynthesis: Localization and Characterization of the menA Gene fromEscherichia coli
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Menaquinone (Vitamin K2) Biosynthesis: Localization and Characterization of the menA Gene fromEscherichia coli

机译:甲萘醌(维生素K2)的生物合成:大肠杆菌menA基因的定位和表征

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A key reaction in the biosynthesis of menaquinone involves the conversion of the soluble bicyclic naphthalenoid compound 1,4-dihydroxy-2-naphthoic acid (DHNA) to the membrane-bound demethylmenaquinone. The enzyme catalyzing this reaction, DHNA-octaprenyltransferase, attaches a 40-carbon side chain to DHNA. The menA gene encoding this enzyme has been cloned and localized to a 2.0-kb region of the Escherichia coli genome between cytR and glpK. DNA sequence analysis of the cloned insert revealed a 308-codon open reading frame (ORF), which by deletion analyses was shown to restore anaerobic growth of amenA mutant. Reverse-phase high-performance liquid chromatography analysis of quinones extracted from theorf-complemented cells independently confirmed the restoration of menaquinone biosynthesis, and similarly, analyses of isolated cell membranes for DHNA octaprenyltransferase activity confirmed the introduction of the menA product into theorf-complemented menA mutant. The validity of an ORF-associated putative promoter sequence was confirmed by primer extension analyses.
机译:甲萘醌生物合成中的关键反应包括将可溶性双环萘化合物1,4-二羟基-2-萘甲酸(DHNA)转化为与膜结合的脱甲基甲萘醌。催化该反应的酶DHNA-辛烯基转移酶将40个碳的侧链连接到DHNA。已经克隆了编码该酶的 menA 基因,并将其定位在 cytR glpK之间的大肠杆菌基因组的2.0 kb区。 。克隆插入物的DNA序列分析揭示了一个308密码子开放阅读框(ORF),通过缺失分析显示该恢复框可恢复a menA 突变体的厌氧生长。从 orf 补体细胞中提取的醌的反相高效液相色谱分析独立地证实了甲萘醌生物合成的恢复,并且类似地,对分离的细胞膜进行DHNA八烯丙基转移酶活性的分析也证实了该方法的引入。将 menA 产物转化为 orf 互补的 menA 突变体。通过引物延伸分析证实了ORF相关推定启动子序列的有效性。

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