联系我们 加入收藏
 
年期检索 高级检索
33
2025年8月13日 星期三
  2016, Vol. 24 Issue (3): 454-460    
  研究资源与技术改进 本期目录 | 过刊浏览 | 高级检索 |
bkdFGH和aveD基因缺失多拉菌素工程菌株的构建
刘振1,潘媛媛2,杨在清2,雷霆3
1. 华中农业大学
2.
3. 南阳师范学院
Construction of bkdFGH and aveD-deleted Doramectin-producing Strains
Zhen Liu1,Yuanyuan Pan1,Zaiqing Yang1,Ting Lei
全文: PDF (1509 KB)   HTML (1 KB) 
输出: BibTeX | EndNote (RIS)      
摘要 多拉菌素(doramectin)是一种新型大环内酯类抗寄生虫药物,为阿维菌素的衍生物,可由基因重组阿维链霉菌(Streptomyces avermitilis)发酵产生,在畜牧业生产中应用广泛。为获得可用于生产的能够稳定制造多拉菌素的阿维链霉菌工业菌株,本研究以阿维菌素高产菌株SAV939为基础,通过对阿维菌素生物合成基因簇进行遗传改造,构建获得阿维链霉菌突变株S. avermitilis LZ-01和LZ-02。LZ-01是通过同源双交换法构建的支链α-酮酸脱氢酶基因簇 (branched-chain alpha-keto acid dehydrogenase gene cluster, bkdFGH)缺失突变株,自身无法合成多拉菌素,当在发酵过程中添加环己甲酸时即可产生多拉菌素(CHC-B1)。LZ-01缺失avermectin D(aveD)基因即获得突变株LZ-02,对其发酵仍可获得多拉菌素,但不再产生无效的CHC-A组分,为分离纯化提供了便利。突变菌株LZ-01和LZ-02的构建为进一步优化发酵条件,提高多拉菌素产率奠定了基础。
服务
把本文推荐给朋友
加入我的书架
加入引用管理器
E-mail Alert
RSS
作者相关文章
刘振
潘媛媛
杨在清
雷霆
关键词 阿维链霉菌多拉菌素支链α-酮酸脱氢酶基因簇(bkdFGH)Avermectin D(aveD)    
Abstract:Doramectin is a novel macrolide antibiotics derived from avermectin and widely used as an anti-parasitic drug in animal husbandry. Doramectin can be produced by genetically modified Streptomyces avermitilis with altered avermectin synthesis pathways. Disruption of branched-chain alpha-keto acid dehydrogenase gene cluster (bkdFGH), which encodes the components of the branched-chain alpha-keto acid dehydrogenase(BCDH) complex multi-enzyme system, can direct S. avermitilis to produce effective doramectin (CHC-B1), along with other undesired analogues such as CHC-A1 and -A2, when cyclohexanecarboxylic acid (CHC) is added to the fermentation medium as a precursor. aveD, which encodes avermectin B 5-O-methyltransferase, is reported to be responsible for transforming avermectin "B" component to "A". Deletion of aveD may reduce the amount of CHC-A component in doramectin produced by bkdFGH-deleted S. avermitilis. Here we reported the construction of 2 mutant S. avermitilis strains capable of doramectin biosynthesis. S. avermitilis strain SAV939, an avermectin high-producing strain, was deleted for bkdFGH gene by homologous double crossover to generate mutant strain LZ-01. High performance liquid chromatography (HPLC) analysis demonstrated that LZ-01 could produce effective doramectin (CHC-B1) when CHC was added as a precursor in the fermentation process. Based on that, we further deleted avermectin D(aveD) in LZ-01 and obtained mutant strain LZ-02. Like LZ-01, LZ-02 could also produce CHC-B1 through fermentation, but without the ineffective component CHC-A. This work provides 2 novel doramectin producer mutants from an avermectin-overproducing industrial strain of S. avermitilis, which could potentially become industrial doramectin-producing strains after further improvement.
Key wordsStreptomyces avermitilis    Doramectin    Branched-chain alpha-keto acid dehydrogenase gene cluster(bkdFGH)    Avermectin D(aveD)
收稿日期: 2015-08-19      出版日期: 2016-02-05
基金资助:国家科技重大专项(转基因生物新品种培育专项)
通讯作者: 雷霆     E-mail: leiting@mail.hzau.edu.cn
引用本文:   
刘振 潘媛媛 杨在清 雷霆. bkdFGH和aveD基因缺失多拉菌素工程菌株的构建[J]. , 2016, 24(3): 454-460.
Zhen Liu Yuanyuan Pan Zaiqing Yang Ting Lei. Construction of bkdFGH and aveD-deleted Doramectin-producing Strains. , 2016, 24(3): 454-460.
链接本文:  
http://journal05.magtech.org.cn/Jwk_ny/CN/     或     http://journal05.magtech.org.cn/Jwk_ny/CN/Y2016/V24/I3/454
 
版权所有 © 2014 《农业生物技术学报》编辑部   京ICP备11035905号-3
地址:北京市海淀区圆明园西路2号中国农业大学生命科学楼1053室 邮编:100193
电话:010-62733684 传真:010-62731615 E-mail: nsjxb@cau.edu.cn