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    • 5. 发明申请
    • SINGLE PROTEIN PRODUCTION IN LIVING CELLS FACILITATED BY A MESSENGER RNA INTERFERASE
    • 生物细胞中的单蛋白生产由信使RNA干扰素
    • US20100035346A1
    • 2010-02-11
    • US11750314
    • 2007-05-17
    • Masayori InouyeJunjie ZhangMotoo Suzuki
    • Masayori InouyeJunjie ZhangMotoo Suzuki
    • C12N15/74C12N1/21
    • C12N9/22C12N15/67C12N15/74
    • The present invention describes a single-protein production (SPP) system in living E. coli cells that exploits the unique properties of an mRNA interferase, for example, MazF, a bacterial toxin that is a single stranded RNA- and ACA-specific endoribonuclease, which efficiently and selectively degrades all cellular mRNAs in vivo, resulting in a precipitous drop in total protein synthesis. Concomitant expression of MazF and a target gene engineered to encode an ACA-less mRNA results in sustained and high-level (up to 90%) target expression in the virtual absence of background cellular protein synthesis. Remarkably, target synthesis continues for at least 4 days, indicating that cells retain transcriptional and translational competence despite their growth arrest. SPP technology works well for yeast and human proteins, even a bacterial integral membrane protein. This novel system enables unparalleled signal to noise ratios that should dramatically simplify structural and functional studies of previously intractable but biologically important proteins. The present invention also provides an optimized condensed single protein production system.
    • 本发明描述了利用mRNA干扰酶的独特性质的活的大肠杆菌细胞中的单蛋白质生产(SPP)系统,例如MazF,单链RNA-和ACA特异性内切核糖核酸酶的细菌毒素, 其有效和选择性地降解体内所有细胞mRNA,导致总蛋白质合成的急剧下降。 MazF和旨在编码无ACA mRNA的靶基因的伴随表达导致在虚拟无背景细胞蛋白质合成中的持续和高水平(高达90%)的靶表达。 值得注意的是,目标合成持续至少4天,表明细胞保留转录和翻译能力,尽管其生长停滞。 SPP技术适用于酵母和人类蛋白质,甚至细菌整合膜蛋白。 这种新颖的系统能够实现无与伦比的信噪比,这将显着简化以前难以处理但生物重要的蛋白质的结构和功能研究。 本发明还提供优化的冷凝单蛋白生产系统。
    • 9. 发明授权
    • Novel cloning vehicles for polypeptide expression in microbial hosts
    • 用于微生物宿主中多肽表达的新型克隆载体
    • US4643969A
    • 1987-02-17
    • US494040
    • 1983-07-25
    • Masayori InouyeYoshihiro Masui
    • Masayori InouyeYoshihiro Masui
    • C12N15/62C12N15/70C12P21/00C12N1/00C12N15/00
    • C12N15/62C12N15/70Y10S930/30
    • Methods and compositions are provided for regulated expression of polypeptides in transformed bacterial hosts. A novel class of plasmid cloning vehicles includes a DNA sequence coding for the desired polypeptide (on an insertion site therefor) linked for transcriptional expression in reading phase with four functional fragments derived from the lipoprotein gene of E. coli. The plasmids further include a DNA sequence coding for a specific segment of the E. coli lac promoter-operator, which is positioned in the proper orientation for transcriptional expression of the desired polypeptide, as well as a separate functional E. coli lacI gene coding for the associated repressor molecule which can interact with the lac promoter-operator to prevent transcription therefrom. Expression of the desired polypeptide is under the control of both the constitutive promoter and the inducible promoter, although transcription from either promotor is normally blocked by the repressor molecule. However, the repressor can be selectively inactivated by means of an inducer molecule to permit transcriptional expression of the desired polypeptide from both promoter. The methods utilize such plasmids to introduce genetic capability into micro-organisms for the production of proteins, such as medically or commerically useful hormones, enzymes, immunogenic proteins, or intermediates therefor, but only in the presence of an appropriate inducer.
    • 提供了用于在转化的细菌宿主中调节多肽表达的方法和组合物。 一类新颖的质粒克隆载体包括编码与在大肠杆菌的脂蛋白基因中衍生的四个功能片段相连的用于在阅读阶段转录表达的期望多肽(在其插入位点上)的DNA序列。 质粒还包括编码大肠杆菌lac启动子 - 操纵子的特定区段的DNA序列,其定位于所需多肽的转录表达的正确取向,以及编码所述多肽的单独的功能性大肠杆菌lacI基因 可与lac启动子 - 操纵子相互作用以阻止转录的相关阻遏物分子。 所需多肽的表达受组成型启动子和诱导型启动子的控制,尽管来自启动子的转录通常被阻遏物分子阻断。 然而,阻遏物可以通过诱导剂分子选择性地失活以允许来自两个启动子的所需多肽的转录表达。 所述方法利用这种质粒将遗传能力引入微生物以产生蛋白质,例如医学或商业上有用的激素,酶,免疫原性蛋白质或其中间体,但仅在适当的诱导剂存在下。