双河洞放线菌多样性和抗菌活性的初步研究——以阴河洞和杉林洞为例

放线菌是微生物中重要的药用菌,其产生的抗生素是20世纪医学皇冠上最耀眼的明珠,但随着抗生素滥用,抗生素耐药现象日趋严重,因此从特殊生态环境中发现新放线菌物种和新抗生素克服耐药是科研人员正在尝试的途径之一,文章初步探究双河洞系统中阴河洞和杉林洞两个支洞的放线菌多样性,并对分离菌株的抗菌活性进行筛选。以纯培养方法获得放线菌,以16SrRNA基因序列比对,分析菌株类别,获得的菌株进行液体发酵,纸片琼脂扩散法测定其发酵产物对真菌和细菌的抗菌活性,同时用PCR技术进行NRPS、PKSI和PKSII抗生素生物合成基因的探测。从两个支洞样品中分离到的放线菌分布于7个科10个属,两个洞共66株放线菌中有32株...

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Published in中国岩溶 Vol. 34; no. 6; pp. 624 - 630
Main Author 戴素娟 郭琳 刘少伟 李静 庹利 周文龙 吴克华 贺卫 李坡 孙承航
Format Journal Article
LanguageChinese
Published 贵州省喀斯特洞穴资源开发利用工程技术研究中心,贵州贵阳550001 2015
中国医学科学院&北京协和医学院医药生物技术研究所,北京,100050%贵州省山地资源研究所,贵州贵阳550001
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ISSN1001-4810
DOI10.11932/karst20150612

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Summary:放线菌是微生物中重要的药用菌,其产生的抗生素是20世纪医学皇冠上最耀眼的明珠,但随着抗生素滥用,抗生素耐药现象日趋严重,因此从特殊生态环境中发现新放线菌物种和新抗生素克服耐药是科研人员正在尝试的途径之一,文章初步探究双河洞系统中阴河洞和杉林洞两个支洞的放线菌多样性,并对分离菌株的抗菌活性进行筛选。以纯培养方法获得放线菌,以16SrRNA基因序列比对,分析菌株类别,获得的菌株进行液体发酵,纸片琼脂扩散法测定其发酵产物对真菌和细菌的抗菌活性,同时用PCR技术进行NRPS、PKSI和PKSII抗生素生物合成基因的探测。从两个支洞样品中分离到的放线菌分布于7个科10个属,两个洞共66株放线菌中有32株的发酵产物在至少一个抗菌活性筛选中显示阳性,总阳性率为48.5%。抗生素生物合成基因的初步探测结果显示,31株菌存在至少一个生物合成基因,NRPS28株,PKS117株,PKSII21株,其中12株同时具有3种生物合成基因。初步显示了双河洞系统蕴含丰富的放线菌资源,值得深入研究。
Bibliography:cave, actinomycetes, pure culture, biosynthetic gene cluster, antibiotics
Actinomycetes are important microorganisms in medicinal fungus, from which antibiotics inmedi- cation has been regarded as the most dazzling pearl in the 20th century. However, with the abuse of antibiot- ics, antibiotic resistance phenomenon has become increasingly serious. It is hence necessary to discover new actinomycete species from special ecological environment to overcome the problem of drug resistance to existing antibiotics. This study aims to analyze the diversity and antimicrobial activity of actinomycetes discovered from Yinhedong and Shanlindong caves, the branches of the Shuanghe cave system, by using cultivation-dependent method to isolate the actinomycetes from the samples collected in the two caves. The diversity was analyzed by comparison of 16S rRNA gene sequences. The antifungal and antimicrobial activity of the fermen- tation products of the isolates were tested by paper disk diffusion method. Screening of PKS I, PK
ISSN:1001-4810
DOI:10.11932/karst20150612