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    • 2. 发明授权
    • Periplasmic protease mutants of Escherichia coli
    • 大肠杆菌的周质蛋白酶突变体
    • US4946783A
    • 1990-08-07
    • US85402
    • 1987-08-14
    • Jonathan R. BeckwithKathryn L. Strauch
    • Jonathan R. BeckwithKathryn L. Strauch
    • C12N1/21C12N9/16C12N9/52C12N15/57C12N15/70
    • C12R1/19C12N15/70C12N9/16C12N9/52C07K2319/00C07K2319/034C07K2319/036C07K2319/61Y10S435/849
    • This invention features a method of isolating a mutant strain of Escherichia coli, having a defective periplasmic protease, the method comprising the steps of: mutagenizing an E. coli cell, wherein the cell comprises: (a) an inner and an outer membrane, (b) a periplasmic space between the membranes, (c) a protein which in a first state is mobile, being able to move through the outer membrane and enter medium surrounding the cells, the protein in the first state being detectable in the medium, and in a second state is not mobile, remaining inside the cell, and (d) a periplasmic protease which converts the protein from the second state to the first state in the cell, and selecting a mutant cell which produces a reduced level of the detectable protein in the medium compared to the E. coli cell, wherein the mutant cell comprises the defective periplasmic protease.This invention also features mutant strains of E. coli having a defective periplasmic protease.
    • 本发明的特征在于分离具有缺陷周质蛋白酶的大肠杆菌突变菌株的方法,所述方法包括以下步骤:诱变大肠杆菌细胞,其中所述细胞包含:(a)内膜和外膜, b)膜之间的周质空间,(c)蛋白质,其在第一状态下是可移动的,能够移动通过外膜并进入细胞周围的介质,第一状态中的蛋白质可在培养基中检测,以及 在第二状态下不能移动,保留在细胞内,和(d)将蛋白质从细胞中的第二种状态转化为第一状态的周质蛋白酶,并且选择产生可检测蛋白质水平降低的突变细胞 在所述培养基中与大肠杆菌细胞相比,其中所述突变细胞包含有缺陷的周质蛋白酶。 本发明还涉及具有缺陷周质蛋白酶的大肠杆菌突变菌株。