pTrcHis2A大肠表达质粒
基本信息
启动子: Trc/lac promoter
复制子: PBR322 ori
终止子: rrnB TT
质粒大小: 4406bp
质粒标签: C-Myc,C-6xHis
原核抗性: 氨苄青霉素Amp
克隆菌株: 大肠杆菌DH5α
培养条件: 37℃,有氧,LB
表达宿主: 大肠杆菌
培养条件: 37℃,有氧,LB
诱导方式: IPTG或乳糖及其类似物
5'测序引物: pTrcHis-F: GAGGTATATATTAATGTATCG
3'测序引物: pTrcHis-F: GAGGTATATATTAATGTATCG
备注: pTrc表达质粒
质粒简介
pTrcHis2A质粒是一个大肠杆菌蛋白表达载体,Trc启动子驱动目的基因的表达。The pTrcHis2 plasmids are pBR322-derived expression vectors designed for efficient recombinant protein expression and purification in E. coli. High levels of expression are possible using the trc (trp-lac) promoter (Egon et al., 1983) and the rrnB anti-termination region (Li et al., 1984). The trc promoter contains the –35 region of the trp promoter together with the –10 region of the lac promoter (Brosius et al., 1985; Egon et al., 1983; Mulligan et al., 1985). To regulate expression, the gene encoding Lac repressor (lacIq) is provided in the pTrcHis2 vectors, allowing regulation of the trc promoter regardless of whether the host strain contains a gene encoding the Lac repressor. Isopropyl-Beta-D-thiogalactopyranoside (IPTG) is used to induce expression of your gene. Translation is enhanced by the bacteriophage T7 gene 10 translation enhancer and a minicistron that provides highly efficient translational restart into the open reading frame of the multiple cloning site. DNA inserts are positioned downstream and in frame with the initiation ATG and a C-terminal fusion peptide. The C-terminal peptide encodes the myc epitope and six histidine residues that function as a metal binding site in the expressed protein.
质粒图谱
![](http://shqshengbio.com/uploads/allimg/200928/1-20092R045149C.gif)
![](http://shqshengbio.com/uploads/allimg/200928/1-20092R04526256.gif)
扩增流程
收到产品后,请先根据产品管壁标签来判断产品形式,并在扩增前准确查找该质粒的抗性、感受态和培养温度。
1、质粒干粉(请务必转化挑单克隆重提后使用)
①收到质粒干粉后请先5000rpm离心1min,再加入20μl 无菌水溶解质粒;
②取2μl质粒加至100μl 感受态中,冰浴30min后,42℃热激60s,不要搅动,再冰浴2min;
(从第二步开始均要在超净工作台中无菌操作)
③加入500μl无抗的LB液体培养基,180rpm震荡培养45min;
④取10μl、100μl复苏液,并分别涂布至目标质粒抗性的LB平板上;
(可使用本平台的平板涂布专用玻璃珠进行涂布,可以比传统涂布方法获得更多转化子)
⑤将平板正向培养1h,再倒置37度培养16h。如果要求是30度则培养20h;
(如果菌落过多,请将质粒稀释后再转化。如果无菌落,请加入10μl质粒离心全涂转化)
⑥挑取单菌落至LB液体培养基中,加入对应抗生素,220rpm震荡培养14h,根据实验需要和质粒提取试剂盒说明书提取质粒。
2、甘油菌:四区划线后挑单菌落培养,酵母菌需要先液体复苏再四区划线,再挑单菌落液体培养。
3、穿刺菌:穿刺接种,液体培养后四区划线,再挑单菌落液体培养。
4、平板:直接挑取单菌落至液体培养基中。
5、液体质粒:单独提取的液体质粒收到后可直接使用。