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    • 18. 发明授权
    • Method for stabilizing nitrilase activity and preserving microbial cells with carbamate salts
    • 稳定腈水解酶活性和用氨基甲酸盐保存微生物细胞的方法
    • US06677149B2
    • 2004-01-13
    • US09854498
    • 2001-05-14
    • Robert DicosimoArie Ben-BassatRobert D. Fallon
    • Robert DicosimoArie Ben-BassatRobert D. Fallon
    • C12N104
    • C12N1/04C12N9/78C12N9/96C12N11/04C12N11/08C12N11/10C12P13/00
    • A method for preserving immobilized or unimmobilized microbial cells having nitrilase activity and for stabilizing the nitrilase activity of unimmobilized or immobilized microbial cells has been developed. Aqueous suspensions containing at least 100 mM bicarbonate, carbonate, or carbamate salts limit microbial contamination of the stored enzyme catalyst, as well as stabilize the desired nitrilase activity of the unimmobilized or immobilized cells. Microorganisms which are characterized by an nitrilase activity and are stabilized and preserved by this method include Acidovorax facilis 72-PF-15 (ATCC 55747), Acidovorax facilis 72-PF-17 (ATCC 55745), Acidovorax facilis 72W (ATCC 55746), and transformed microbial cells having nitrilase activity, the host cells transformed with Acidovorax facilis 72W nitrilase activity. Especially preferred is an embodiment using ammonium carbamate as the inorganic salt.
    • 已经开发了用于保存具有腈水解酶活性的固定或未固化的微生物细胞并稳定未固定或固定的微生物细胞的腈水解酶活性的方法。 含有至少100mM碳酸氢盐,碳酸盐或氨基甲酸盐的含水悬浮液限制所储存的酶催化剂的微生物污染物,以及稳定未固化或固定的细胞的所需腈水解酶活性。 其特征在于腈水解酶活性并通过该方法稳定和保存的微生物包括Acidovorax facilis 72-PF-15(ATCC 55747),Acidovorax facilis 72-PF-17(ATCC 55745),Acidovorax facilis 72W(ATCC 55746)和 转化的具有腈水解酶活性的微生物细胞,宿主细胞用Acidovorax facilis 72W腈水解酶活性转化。 特别优选的是使用氨基甲酸铵作为无机盐的实施方案。