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    • 7. 发明授权
    • Bacillus thuringiensis apr and npr genes, apr and npr B.t. strains, and
method of use
    • 苏云金芽孢杆菌apr和npr基因,apr和npr B.t. 菌株和使用方法
    • US5759538A
    • 1998-06-02
    • US415823
    • 1995-03-31
    • William P. DonovanYuping Tan
    • William P. DonovanYuping Tan
    • A01N63/00C07K14/325C12N1/21C12N9/54C12N15/57C12N1/20
    • C07K14/325A01N63/00C12N9/54
    • The present invention is based on the discovery, isolation, sequencing and characterization of two protease genes present in Bacillus thuringiensis (B.t.). One is an alkaline protease gene generally designated "apr. " The other is a neutral protease gene generally designated "npr." The invention also includes genetically disabling the apr and the npr genes to reduce proteolytic activity of the proteases encoded by the genes, and using the disabled genes in insecticidal B.t. constructs along with one or more B.t. protein toxin genes. These resulting B.t. constructs are useful for the enhanced production of B.t. toxin protein. The B.t. toxin protein recovered from the fermentation production of these B.t. constructs also exhibits improved stability with respect to its insecticidal activity.
    • 本发明基于存在于苏云金芽孢杆菌(B.t.)中的两种蛋白酶基因的发现,分离,测序和表征。 一种是通常称为“apr”的碱性蛋白酶基因。另一种是通常称为“npr”的中性蛋白酶基因。 本发明还包括遗传地使apr和npr基因失活以降低由该基因编码的蛋白酶的蛋白水解活性,并且在杀虫剂B.t.中使用残基的基因。 与一个或多个B.t.一起构建。 蛋白毒素基因。 这些结果 构建体可用于增强生产B.t. 毒素蛋白。 B.t. 从这些B.t.的发酵生产中回收的毒素蛋白质。 相对于其杀虫活性,构建体还表现出改进的稳定性。