【关键字】医学, 抗病毒肽 抗病毒肽 抗病毒肽 抗病毒肽
【摘要】 目的: 克隆和表达Alloferon1基因2串联体. 方法: 利用同尾酶法基因同向串联方案,在人工合成Alloferon1全基因的基础上,将Alloferon1基因由单体连接成2串联体,继而将获得的正确Alloferon1基因2串联体插入pGEX4T1表达载体诱导表达. 结果: 构建的Alloferon1基因2串联体经酶切和DNA测序分析,结果表明该基因串联体的序列与设计的序列完全相同. Alloferon1基因2串联体插入pGEX4T1载体后,重组菌经37℃诱导4 h,SDSPAGE分析结果显示,该串联体得到较高水平的表达. 结论: Alloferon1基因2串联体的构建与表达均获得了成功.
【关键词】 抗病毒肽;基因,Alloferon1;同尾酶;同向串联;大肠杆菌
【Abstract】 AIM: To clone and express a tandem of repeated gene recombinant plasmid pGEX4T1(Alloferon1)2.METHODS: Whole Alloferon1 gene was synthesized and inserted into pUC18 cloning vector. Double repeats of Alloferon1 gene were obtained with isoschizomer construction method. Then the correct tandem of gene repeats was inserted into EcoRI and SalI sites of pGEX4T1 expression vector. RESULTS: The sequencing and restriction enzyme digestion analysis showed that 2repeat tandem of Alloferon1 gene was connected correctly and cloned into pUC18 vector. After the recombinant bacteria was induced at 37℃ for 4 h, a new anticipated protein band with relative molecule mass of 32×103 was found on SDSPAGE gel. CONCLUSION: The correct tandem of 2 repeats of Alloferon1 gene is constructed and expressed in E.coli successfully.
【Keywords】 antiviral peptide; genes, Alloferon1; isoschizomer; tandem; Escherichia coli
0 引言 Alloferon1是俄国科学家Chernysh等[1]于2002年从人工干预热灭活大肠杆菌和金黄色葡萄球菌丽蝇幼虫血淋巴中分离得到的一种抗病毒和抗肿瘤的小肽,是由13个氨基酸残基组成的阳离子肽,其一级结构与昆虫防御素,天蚕素,富含脯氨酸的抗菌肽相似.研究表明Alloferon1对甲型乙型流感病毒、肝炎病毒和慢性髓性白血病K562细胞均有抑制作用,是一个具有潜在应用价值的小活性肽. 由于其分子质量较小,克隆、表达、纯化、检测都会有一定难度,本实验拟采用同尾酶法基因同向串联的方法[2],将Alloferon1基因串联起来,构建该基因的2串联体后表达该串联体,以增加其稳定性和表达量,为进一步的纯化和生物活性测定奠定基础.
1 材料和方法
1.1 材料 大肠杆菌DH5α,质粒pGEX4T1均为本室保存;质粒pUC18,T4 PNK,限制酶,Xgal,DNA maker,IPTG均购自TaKaRa公司,UNIQ10柱式DNA胶回收试剂盒,小量质粒提取试剂盒均购自天根公司,其它试剂均为国产分析纯,基因由上海生工合成.
1.2 方法
[1] [2] 下一页 |