pGADT7-Rec2酵母单杂交质粒

pGADT7-Rec2酵母单杂交质粒

基本信息

启动子: T7,ADH1

复制子: pUC ori

质粒分类: 酵母系列，酵母单杂交载体

质粒大小: 7.6kb

原核抗性: Amp

筛选标记: LEU2

克隆菌株: DH5α

培养条件: 37℃，有氧 LB

表达宿主: 酵母细胞

5'测序引物: T7:TAATACGACTCACTATAGGG

3'测序引物: 根据序列设计引物

质粒简介

     pGADT7-Rec2 is a cloning vector that can be used in yeast to express a protein of interest as a GAL4 activation domain (GAL4 AD) fusion. Transcription starts with the constitutive ADH1 promoter (PADH1) and ends with the ADH1 termination signal (TADH1). The GAL4 AD sequence includes the SV40 nuclear localization signal (SV40 NLS; 1) so that fusions translocate to the yeast nucleus. GAL4 AD fusions also contain a hemagglutinin (HA) epitope tag. The T7 promoter in pGADT7-Rec2 can be used for in vitro transcription and translation of the HA-tagged fusion protein. It also provides a binding site for sequencing with the T7 Promoter Sequencing Primer.

     pGADT7-Rec2 is a shuttle vector; it can be maintained in both yeast and bacteria. It contains an autonomous replication sequence (ARS4) and a LEU2 nutritional marker for replication and selection in yeast (2, 3). A centromeric sequence (CEN6) is included to ensure proper segregation of the plasmid during cell division (2, 3). For propagation and selection in E. coli, the vector contains a pUC origin of replication (pUC ori) and an ampicillin resistance gene (Ampr).

     pGADT7-Rec2 is derived from pGADT7-Rec, a cloning vector used in the Matchmaker (Two-Hybrid) Library Construction & Screening Kit (Cat. No. 630445). It was constructed by replacing the 2μ ori in pGADT7-Rec with the ARS4 and CEN6 elements. The ARS and CEN elements ensure stable, low-copy propagation of the vector. Unlike pGADT7-Rec, which is able to replicate multiple times during the yeast cell cycle, pGADT7-Rec2, with its ARS and CEN elements, can replicate only once during the cell cycle, so its copy number is restricted. Low-copy plasmids such as pGADT7-Rec2 are preferred for one-hybrid screening because they generate fewer false positives. In the original Matchmaker One-Hybrid System, copy number was restricted not by using low-copy, autonomously replicating plasmids, but by integrating the reporter construct into the yeast genome. With the development of pGADT7-Rec2 (and pHIS2, a low-copy reporter vector), integration is no longer necessary because each plasmid, with its CEN and ARS elements, now behaves like a minichromosome, both mitotically and meiotically.

质粒图谱

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。