基于NRPS基因篩選鑒定產(chǎn)生環(huán)脂肽葡萄附生細(xì)菌的研究
[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(nóng)業(yè)大學(xué)食品科技學(xué)院;
【基金】:2016年農(nóng)產(chǎn)品質(zhì)量安全風(fēng)險評估項目(GJFP201601205)
【分類號】:TS255.1
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