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    • 20. 发明授权
    • Method for identifying mutants secreting high levels of heterologous
proteins
    • 用于鉴定分泌高水平异源蛋白质的突变体的方法
    • US4923808A
    • 1990-05-08
    • US220901
    • 1988-07-18
    • Mark D. Matteucci
    • Mark D. Matteucci
    • C07K14/61C12N9/16C12N15/62C12N15/65
    • C07K14/61C12N15/62C12N15/65C12N9/16C07K2319/00
    • A method is provided for identifying mutants that leads to the enhanced expression and periplasmic secretion of heterologous preproteins from host cells. Mutants in the host cell or in the gene encoding the heterologous preprotein are identified readily by transforming the host cell with a fusion which comprises DNA encoding the heterologous preprotein and a detectable marker protein. A marker protein is chosen that only becomes active in the periplasmic or extracellular environment. Thus, desired mutants are identified by enhanced marker expression and secretion. The ability of the preprotein DNA or host cell mutants to enhance expression and secretion of the heterologous protein-enzyme fusions is found to correlate with similar enhancement of the expression and secretion of the heterologous protein alone and not as a fusion. Screening assays led to the identification of a preprotein silent mutation resulting in high-yield secretion that could not be explained under current theories and which provides a new method for obtaining high-yielding host-vector systems.
    • 提供了用于鉴定导致来自宿主细胞的异源前蛋白的增强的表达和周质分泌的突变体的方法。 通过用包含编码异源前蛋白和可检测标记蛋白的DNA的融合物转化宿主细胞,容易地鉴定宿主细胞中或编码异源前蛋白的基因中的突变体。 选择仅在周质或细胞外环境中变得活跃的标记蛋白。 因此,通过增强的标志物表达和分泌来鉴定所需的突变体。 发现原蛋白DNA或宿主细胞突变体增强异源蛋白质 - 酶融合物的表达和分泌的能力与单独的异源蛋白质的表达和分泌的类似增强相关,而不是融合。 筛选测定导致鉴定导致高产量分泌的蛋白质沉默突变,这在目前的理论中无法解释,并且提供了获得高产量宿主载体系统的新方法。