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    • 6. 发明授权
    • Inducible expression system
    • 诱导表达系统
    • US06432705B1
    • 2002-08-13
    • US09566660
    • 2000-05-08
    • Jiing-Kuan YeeTheodore FriedmannShin-Tai Chen
    • Jiing-Kuan YeeTheodore FriedmannShin-Tai Chen
    • C12N500
    • C12N15/86C12N2740/13043C12N2830/002C12N2830/006C12N2840/20C12N2840/203
    • The present invention features compositions and methods for the inducible expression of a polypeptide, especially a polypeptide normally cytotoxic to the eukaryotic host cell in which it is to be expressed. A nucleotide sequence encoding a polypeptide of interest is operably linked to an inducible promoter. Expression from the inducible promoter is regulated by a multi-chimeric transactivating factor, composed of a first ligand-binding domain that negatively regulates transcription, a transcriptional activation domain, and a second ligand-binding domain that positively regulates the transcriptional activation function of the transactivator. Transcription of the nucleotide sequence under control of the inducible promoter is activated by the multi-chimeric transactivator when both the ligand that binds the first ligand-binding domain is absent and the ligand that binds the second ligand-binding domain is present. This inducible expression system is particularly useful in the expression of the cytotoxic protein VSV G for the production of pseudotyped retroviral vectors.
    • 本发明的特征在于可诱导表达多肽的组合物和方法,特别是对待其表达的真核宿主细胞通常具有细胞毒性的多肽。 编码目的多肽的核苷酸序列与诱导型启动子可操作地连接。 来自诱导型启动子的表达由多嵌合反式激活因子调节,所述多嵌合反式激活因子由负调节转录的第一配体结合结构域,转录激活结构域和正调节反式激活因子的转录激活功能的第二配体结合结构域组成 。 当两个结合第一配体结合结构域的配体和不存在结合第二配体结合结构域的配体时,多重嵌合反式激活剂可激活在诱导型启动子控制下的核苷酸序列的转录。 这种诱导表达系统特别可用于细胞毒素蛋白VSV G的表达以产生假型逆转录病毒载体。