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疣孢菌的生物勘探、分离与鉴定
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摘要
分子生物学、生物信息学技术及各种组学技术的发展与应用,不仅为微生物资源研究提供了新的技术方法,也为微生物资源研究提供了新的策略与思路。因此,本课题以具有天然产物合成潜力的疣孢菌(Verrucosispora)属放线菌为目标,应用“生物勘探-多样性分析-选择性分离”的策略,获取疣孢菌菌株,为挖掘疣孢菌资源,研究其生态作用奠定基础。
     根据疣孢菌属16S rRNA基因的序列特征设计了一对疣孢菌属特异性引物(S-G-Verr-0195-a-S-20和S-G-Verr-1152-a-A-19)。序列水平、模式菌株纯培养物水平的评价显示该引物与疣孢菌属所有种的代表菌株匹配,而与小单孢菌科的其它属模式种都不能匹配,具有属特异性。利用该引物对来自红树林、海洋沉积物的20个样品进行PCR扩增,发现除3个深海沉积物样品外,其余17个样品都有扩增产物。挑选其中的5个阳性样品构建16S rRNA基因文库,进行序列聚类分析,发现所有序列均落在疣孢菌属,超过40%的克隆子可能属于疣孢菌属新种。不但进一步验证了疣孢菌属引物特异性,而且也揭示出这些环境中蕴藏着多样性丰富的疣孢菌。
     用9种选择性培养基对PCR检测阳性的10个样品和3个阴性样品进行选择性分离,获得794株放线菌。经疣孢菌特异性PCR快速鉴定,有21株属于疣孢菌属(18株来自MG,3株来自WC)。其中5株具有抗金黄色葡萄球菌活性,3株具有抗耐甲氧西林的金黄色葡萄球菌(MRSA)活性,菌株2603PH03对这两种病原菌生长的抑制率性都很强,分别为91.87%和74.78%。经PKS基因和NRPS基因检测,发现菌株2603PH03与已报道的疣孢菌菌株基因类型不同,显示该菌株具有进一步开发的潜力。
     通过多相分类鉴定,菌株234402和菌株2603PH03是分别邻近V.lutea和V.gifhornensis的两个新种,而菌株232076和菌株234606是属于V.sediminis种的不同菌株。
Development and application of molecular biology, bioinformatics and "omics" technologies provides not only new technologies but also new strategies for exploring microbial resources. The primary aim of this study was to isolate members of the genus Verrucosispora that has been proved to be a rich resource of new bioactive compounds, using the strategy of'bioprospecting-biodiversity-selective isolation', highlighting the biotechnological potential and ecological significance of the members of this taxon.
     A set of genus-specific oligonucleotide primers was generated based on signatural nucleotides sequences of the16S rRNA genes of Verrucosispora strains deposited in GenBank. In silico and pure culture studies showed that the primers matched perfectly with target sequences of16S rRNA gene of representatives of the genus Verrucosispora. The primers, designated S-G-Verr-0195-a-S-20and S-G-Verr-1152-a-A-18, amplified an≈960bp stretch of16S rRNA genes of Verrucosispora strains, but not those of representatives of other genera classified in the family Micromonosporaceae. Genus-specific amplicons were detected in17out of20community DNA samples prepared from diverse marine sediments and coastal soils. Phylogenetic analysis of over40%of clones derived from5of the samples belonged to novel Verrucosispora species. The primers were also used to confirm the identity of794Verrucosispora-like strains isolated from10positive samples and3negative samples using9selective media. Twenty one isolates,18from the Megas Gialos sediment and3from the Wenchang mangrove sample, were provisionally assigned to the genus Verrucosispora on the basis of colony morphology gave the genus-specific amplification product with primers S-G-Verr-0195-a-S-20and S-G-Verr-1152-a-A-19.
     Metabolites of5Verrucosispora strains inhibited Staphylococcus aureus strain SO14, and3out of5strains inhibited MRSA (Methicillin Resistant Staphylococcus aureus) strain9551. The novel candidate species2603PH03was found significant active against these two pathogen strains with inhibition ratio of91.87%and74.78%, respectively. Moreover, this strain was different from other members of the genus Verrucosispora on patterns of PKSs and NRPSs genes, which showed a potential for further research on drug discovery against MRSA.
     Polyphasic taxonomic study of strain234402and strain2603PH03gave result in two novel candidate species, near to V. lutea and V. gifhornensis, respectively. Strain232076and strain234606were assigned to the species V. sediminis.
引文
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