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载体pMal-c4X

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  • ¥800 - 1380
  • HZbscience
  • 中国/美国/德国
  • HZ0507
  • 2025年07月11日
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    • 详细信息
    • 文献和实验
    • 技术资料
    • 保存条件

      -20℃

    • 保质期

      半年

    • 英文名

      pMal-c4X

    • 库存

      200

    • 供应商

      沪震生物

    • 规格

      5ug

    pMal-c4X

    产品信息

    产品货号 产品名称 产品规格 优惠价
    HZ0507 pMal-c4X

    20μl

    ¥请询价

    使用说明

    沪震质粒平台的各批次质粒菌株发货前均经过严格的多重验证,如存在质量问题,请在收到产品的三个月内通知我司。收到质粒后请短暂离心,取2μl转化至对应感受态中,挑取单克隆重新提取质粒后使用。

    基本信息

    启动子: Tac
    复制子: ColE1 ori
    终止子: rrnB T1 terminator
    质粒分类: 大肠杆菌载体;pMal系列表达质粒
    质粒大小: 6645bp
    质粒标签: N-MBP, N-Factor Xa
    原核抗性: 氨苄青霉素Amp
    克隆菌株: DH5α
    培养条件: 37℃,有氧,LB
    表达宿主: BL21(DE3)
    诱导方式: IPTG或乳糖及其类似物
    5'测序引物: MalE引物: 5-GGTCGTCAGACTGTCGATGAAGCC-3;MBP-F: 5-gatgaagccctgaaagacgcgcag-3
    3'测序引物: pBad-5 5-gatttaatctgtatcagg-3; M13-F: 5-TGTAAAACGACGGCCAGT-3

    质粒简介

    The pMAL™-4 vectors (Figure 1) provide a method for expressing and purifying a protein produced from a cloned gene or open reading frame. The cloned gene is inserted downstream from the malE gene of E. coli, which encodes maltose-binding protein (MBP), resulting in the expression of an MBP fusion protein (1,2). The MBP in these vectors has been engineered for tighter binding to amylose. The method uses the strong “tac” promoter and the malE translation initiation signals to give high-level expression of the cloned sequences (3,4), and a one-step purification of the fusion protein using MBP’s affinity for maltose (5). The vectors express the malE gene (with or without its signal sequence) fused to the lacZα gene. Restriction sites between malE and lacZα are available for inserting the coding sequence of interest. Insertion inactivates the β-galactosidase α-fragment activity of the malE-lacZα fusion, which results in a blue to white color change on Xgal plates when the construction is transformed into an α-complementing host such as TB1, JM107 or NEB 5-alpha Competent E. coli (6,7). When present, the signal peptide on pre-MBP directs fusion proteins to the periplasm. For fusion proteins that can be successfully exported, this allows folding and disulfide bond formation to take place in the periplasm of E. coli, as well as allowing purification of the protein from the periplasm (8). The vectors carry the lacIq gene, which codes for the Lac repressor. This keeps expression from Ptac low in the absence of IPTG induction. The pMAL-4 vectors also contain the sequence coding for the recognition site of a specific protease, located just 5´ to the polylinker insertion sites. This allows MBP to be cleaved from the protein of interest after purification. The pMAL-c4X and pMAL-p4X vectors that are included in the system encode the site for Factor Xa (9, 10). Factor Xa cleaves after its four amino acid recognition sequence, so that few or no vector-derived residues are attached to the protein of interest, depending on the site used for cloning. pMAL vectors containing sites for alternative proteases are also available (Figure 1). The vectors pMAL-c4G and pMAL-p4G encode the site for Genenase™I , which cleaves following the sequence His-Tyr. The vectors pMAL-c4E and pMAL-p4E encode the site for Enterokinase , which cleaves following the sequence Asp-Asp-Asp-Asp-Lys.
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    图标文献和实验
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      的工业化前景. IMPACT-TWIN系统包括两个大肠杆菌表达载体――pTWIN1,pTWIN2.之所以叫做Twin,原因在于pTWIN的设计在多克隆位点两端都各有一段intein和CBD,排列如下:几丁质结合蛋白域―intein1―MCS―Intein2―几丁质结合蛋白.这个巧妙的设计有3重便利:N-端,C-端或者N-端和C-端同时融合短的内含肽序列.想做N端融合,你可以将目的基因替换MCS―Intein2―几丁质结合蛋白,如果想做C 端融合表达,就可以将目的基因替换MCS前面的几丁质

    • 去Tag不留痕――NEB原核表达系列

      如下:几丁质结合蛋白域―intein1―MCS―Intein2―几丁质结合蛋白。这个巧妙的设计有3重便利:N-端,C-端或者N-端和C-端同时融合短的内含肽序列。想做N端融合,你可以将目的基因替换MCS―Intein2―几丁质结合蛋白,如果想做C端融合表达,就可以将目的基因替换MCS前面的几丁质结合蛋白域―intein1―MCS,不用分2个载体;而且做过克隆的人会很有体会:很多时候双酶切载体,由于2个酶切位点都多克隆位点上,没有小片断切下来,所以是否成功双酶切就不好判断,如果用Twin载体就会切下一个片断

    • 【原创】绝版分子生物学实用技术分享:

      绝版分子生物学实用技术分享: I: 20 种用于各种DNA marker 制备的PLASMID: P1: 2k+1.5k+1k+800+700+600+500+400+300+200X2+100X4 (100BP ladder) P2: 3k+1.5k+1k+900+700+500+300X2 (200BP ladder 奇数) P3: 3k+2k+1.4k+1k+800+600+4X2 (200BP ladder 偶数) (P3\P4\P5 组合, 可拓展为1KB ladder

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