基于NRPS基因篩選鑒定產生環脂肽葡萄附生細菌的研究
發布時間:2018-11-02 18:39
【摘要】:本研究采用平板稀釋法和斜面分離純化技術,從夏黑葡萄中篩選分離到5株附生細菌,提取菌株的基因組DNA,PCR擴增16S r DNA序列,產物純化后進行克隆測序,利用MEGA 6.0軟件對序列進行同源性比對分析,構建系統進化樹后,將5株附生細菌分別鑒定為克雷伯肺炎桿菌(Klebsiella pneumoniae)、枯草芽孢桿菌(Bacillus subtilis)、克考氏菌(Kocuria marina)、嗜氣芽孢桿菌(Bacillus aerophilus)、類芽孢桿菌(Paenibacillus agaridevorans)。在此基礎上,以非核糖體多肽合成酶基因(non-ribosomal peptide compounds synthetase,NRPS)為靶點,篩選到含有目的條帶的菌株PTWA2,經系統發育樹預測該菌株能夠產生環脂肽類化合物。該菌株發酵產物經有機溶劑萃取、常壓硅膠柱層析、Sephedex LH-20等分離手段純化得到一個單體化合物,采用核磁共振和質譜方法鑒定該化合物為環脂肽Surfactin A。該研究結果為以功能基因定向篩選產生環脂肽化合物的菌株提供了新的研究方法與理論依據。
[Abstract]:In this study, 5 epiphytic bacteria were isolated from summer black grape by plate dilution method and oblique surface purification technique. The 16s r DNA sequence was amplified by genomic DNA,PCR of the isolated strain, and cloned and sequenced after purification. The sequence was analyzed by MEGA 6.0, and phylogenetic tree was constructed. Five strains of epiphytic bacteria were identified as Klebsiella pneumoniae (Klebsiella pneumoniae), Bacillus subtilis (Bacillus subtilis), Kirschner's bacillus (Kocuria marina), respectively. Bacillus aerophilus (Bacillus aerophilus), Bacillus class (Paenibacillus agaridevorans). On this basis, the non-ribosomal polypeptide synthase gene (non-ribosomal peptide compounds synthetase,NRPS) was used as the target, and the strain PTWA2, containing the target band was selected. The phylogenetic tree was used to predict that the strain could produce cyclic peptide compounds. The fermentation product of the strain was extracted by organic solvent, separated by silica gel column chromatography under atmospheric pressure, and purified by Sephedex LH-20. The compound was identified as a cyclic peptide Surfactin A by NMR and MS. The results provide a new method and theoretical basis for the screening of cyclopeptide producing strains by functional gene orientation.
【作者單位】: 南京農業大學食品科技學院;
【基金】:2016年農產品質量安全風險評估項目(GJFP201601205)
【分類號】:TS255.1
本文編號:2306633
[Abstract]:In this study, 5 epiphytic bacteria were isolated from summer black grape by plate dilution method and oblique surface purification technique. The 16s r DNA sequence was amplified by genomic DNA,PCR of the isolated strain, and cloned and sequenced after purification. The sequence was analyzed by MEGA 6.0, and phylogenetic tree was constructed. Five strains of epiphytic bacteria were identified as Klebsiella pneumoniae (Klebsiella pneumoniae), Bacillus subtilis (Bacillus subtilis), Kirschner's bacillus (Kocuria marina), respectively. Bacillus aerophilus (Bacillus aerophilus), Bacillus class (Paenibacillus agaridevorans). On this basis, the non-ribosomal polypeptide synthase gene (non-ribosomal peptide compounds synthetase,NRPS) was used as the target, and the strain PTWA2, containing the target band was selected. The phylogenetic tree was used to predict that the strain could produce cyclic peptide compounds. The fermentation product of the strain was extracted by organic solvent, separated by silica gel column chromatography under atmospheric pressure, and purified by Sephedex LH-20. The compound was identified as a cyclic peptide Surfactin A by NMR and MS. The results provide a new method and theoretical basis for the screening of cyclopeptide producing strains by functional gene orientation.
【作者單位】: 南京農業大學食品科技學院;
【基金】:2016年農產品質量安全風險評估項目(GJFP201601205)
【分類號】:TS255.1
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