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中国生物工程杂志

CHINA BIOTECHNOLOGY
中国生物工程杂志  2013, Vol. 33 Issue (12): 86-91    
技术与方法     
5’非翻译区序列改建提高抗菌肽PR39表达
明飞平1,2, 杨军1, 朱进美1, 邝哲师3, 李华周4, 夏枫耿2, 叶明强3, 王候光4, 赵祥杰3, 黄志丰1, 蔡海明1, 施巨清1, 马苗鹏1, 张玲华1
1. 华南农业大学生命科学学院 广东省农业生物蛋白质功能与调控重点实验室 广州 510642;
2. 广州市微生物研究所 广州 510663;
3. 广东省农科院农业生物技术研究所 广州 510642;
4. 广州市良种猪场 广州 510540
Modification of 5’UTR Sequences of pPIC9K Increases Expression of Antimicrobial Peptide PR39
MING Fei-ping1,2, YANG Jun1, ZHU Jin-mei1, KUANG Zhe-shi3, LI Hua-zhou4, XIA Feng-geng2, YE Ming-qiang3, WANG Hou-guang4, ZHAO Xiang-jie3, HUANG Zhi-feng1, MA Miao-peng1, SHI Ju-qing1, CAI Hai-ming1, ZHANG Ling-hua1
1. College of Life Science, South China Agricultural University, Guangdong Provincial Key Laboratory of Protein Function and Regulation in Agricultural Organisms, Guangzhou 510642, China;
2. Guangzhou Institute of Microbiology, Guangzhou 510663, China;
3. Bio-Tech Research Institute, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China;
4. Guangzhou Fine Breed Swine Farm, Guangzhou 510540, China
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摘要: 目的:在毕赤酵母SMD1168中高效表达抗菌肽PR39,并检测其抗菌活性。方法:根据毕赤酵母密码子偏爱性,人工合成4条寡核苷酸片段,通过重叠PCR获得PR39核苷酸序列,将其插入酵母表达载体pPIC9K,重组表达质粒pPIC9K-PR39经PCR敲除PR39 5’端多余的长度为24bp的核苷酸序列得到pPIC9K-PR39-D,再经PCR、酶切连接构建5’UTR已删除8个核苷酸GGATCCAA的新型毕赤酵母表达载体pPIC9K-PR39-D-E;pPIC9K-PR39-D-E转化到毕赤酵母SMD1168,经PCR鉴定及G418筛选,用0.5%的甲醇诱导表达,Tricine-SDS-PAGE分析,再利用琼脂糖扩散法测定发酵上清的抗菌活性,表达产物经反相层析及SP-Sepharose层析柱纯化测定其表达量。结果:经Tricine-SDS-PAGE检测,在4.7kDa左右处可见目的蛋白表达条带,纯化后测定蛋白浓度表达量约为175.6mg/L。获得的抗菌肽PR39对E.coli DH5α,有明显抑菌活性。结论:经改建后新型毕赤酵母表达载体pPIC9K-PR39-D-E在毕赤酵母中可高效表达抗菌肽PR39,为以后深入研究毕赤酵母高效表达抗菌肽奠定了基础。
关键词: 抗菌肽PR39, pPIC9K5’UTR分泌表达抗菌活性    
Abstract: Objective: To express antibacterial peptide PR39 in Pichia pastoris and determine the activity of product.Methods: Four oligonucleotide fragments were synthesized according to the codon bias of Pichia pastoris,and complete coding sequence was obtained by overlapping PCR, then the sequence was cloned to expression vector pPIC9K. The sequence by Kex2 to the first nucleotide of PR39 was knocked out on the recombinant plasmid pPIC9K-PR39, then the sequence of GGATCCAA in 5'UTR was also deleted by PCR-Restriction Enzyme ligation method, finally a new expression vector named pPIC9K-PR39-D-E was obtained. The vector pPIC9K-PR39-D-E was transformed to Pichia pastoris SMD1168, and clones were identified by PCR and than screened with G418 for expression under induction of 0.5% methanol. The expressed product was identified by Tricine-SDS-PAGE, and determined for antibacterial activity by agarose diffusion test,purified by reversed phase chromatography and ion-exchange column chromatography. Results: PR39 with 4.7kDa and reached 175.6mg/L after purification. It showed antibacterial activity to E.coli DH5α. Conclusion: PR39 was successfully expressed in Pichia pastoris, which laid a foundation of further study on antibacterial peptide.
Key words: Antibacterial peptide    PR39    pPIC9K    5’-untranslated regions    Secretory expression    Antibacterial activity
收稿日期: 2013-08-19 出版日期: 2013-12-25
ZTFLH:  Q786  
基金资助: 广东省产学研项目(2011B090300020);广东省战略性新兴产业核心技术攻关专项资金(2013B);广州市科技攻关项目(201300000040)资助项目
通讯作者: 张玲华,E-mail:lhzhang@scau.edu.cn     E-mail: lhzhang@scau.edu.cn
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引用本文:

明飞平, 杨军, 朱进美, 邝哲师, 李华周, 夏枫耿, 叶明强, 王候光, 赵祥杰, 黄志丰, 蔡海明, 施巨清, 马苗鹏, 张玲华. 5’非翻译区序列改建提高抗菌肽PR39表达[J]. 中国生物工程杂志, 2013, 33(12): 86-91.

MING Fei-ping, YANG Jun, ZHU Jin-mei, KUANG Zhe-shi, LI Hua-zhou, XIA Feng-geng, YE Ming-qiang, WANG Hou-guang, ZHAO Xiang-jie, HUANG Zhi-feng, MA Miao-peng, SHI Ju-qing, CAI Hai-ming, ZHANG Ling-hua. Modification of 5’UTR Sequences of pPIC9K Increases Expression of Antimicrobial Peptide PR39. China Biotechnology, 2013, 33(12): 86-91.

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https://manu60.magtech.com.cn/biotech/CN/        https://manu60.magtech.com.cn/biotech/CN/Y2013/V33/I12/86

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