Method for stabilizing nitrilase activity and preserving microbial cells
    31.
    发明授权
    Method for stabilizing nitrilase activity and preserving microbial cells 有权
    稳定腈水解酶活性和保存微生物细胞的方法

    公开(公告)号:US06368804B1

    公开(公告)日:2002-04-09

    申请号:US09614914

    申请日:2000-07-12

    IPC分类号: C12N120

    摘要: 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. The unimmobilized or immobilized microbial cells are stored in an aqueous solution containing from about 0.10 M to the saturation concentration of an inorganic salt of bicarbonate or carbonate, including ammonium, sodium and potassium salts of bicarbonate or carbonate. Aqueous suspensions containing at least 100 mM bicarbonate or carbonate limit microbial contamination of the stored enzyme catalyst, as well as stabilize the desired nitrilase activity of the uninmmobilized 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, preferably E. coli SS1001 (ATCC PTA-1177) which is transformed with Acidovorax facilis 72W nitrilase activity.

    摘要翻译: 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。 将未固定或固定的微生物细胞储存在含有约0.10M的水溶液中,使饱和浓度为碳酸氢盐或碳酸盐的无机盐,包括碳酸氢盐或碳酸盐的铵,钠和钾盐。 含有至少100mM碳酸氢盐或碳酸氢盐的水性悬浮液限制所储存的酶催化剂的微生物污染物,以及稳定未固定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,优选用Acidovorax facilis 72W腈水解酶活性转化的大肠杆菌SS1001(ATCC PTA-1177)。

    Method for preparing para-hydroxystyrene by biocatalytic decarboxylation of para-hydroxycinnamic acid in a biphasic reaction medium
    37.
    发明授权
    Method for preparing para-hydroxystyrene by biocatalytic decarboxylation of para-hydroxycinnamic acid in a biphasic reaction medium 失效
    在双相反应介质中通过对羟基肉桂酸的生物催化脱羧制备对羟基苯乙烯的方法

    公开(公告)号:US07378261B2

    公开(公告)日:2008-05-27

    申请号:US10824581

    申请日:2004-04-14

    CPC分类号: C12P7/22 C12P7/42

    摘要: A biocatalytic method for preparing para-hydroxystyrene from para-hydroxycinnamic acid is described. The method uses an enzyme source having para-hydroxycinnamic acid decarboxylase activity to catalyze the decarboxylation of para-hydroxycinnamic acid in a biphasic reaction medium to produce para-hydroxystyrene, which is extracted into the organic phase of the biphasic reaction medium. The method results in a high yield of para-hydroxystyrene due to the decreased exposure of the enzyme source to the inhibitory product. The product is readily recovered from the extractant, or may be chemically derivatized directly in the extractant before recovery.

    摘要翻译: 描述了由对羟基肉桂酸制备对羟基苯乙烯的生物催化方法。 该方法使用具有对羟基肉桂酸脱羧酶活性的酶源来催化双相反应介质中对羟基肉桂酸的脱羧作用,产生对羟基苯乙烯,将其提取到双相反应介质的有机相中。 该方法由于酶源暴露于抑制产物而导致对羟基苯乙烯的高产率。 该产物容易从萃取剂中回收,或者可以在回收之前在萃取剂中直接化学衍生化。

    Methods for the preparation of para-hydroxycinnamic acid and cinnamic acid at alkaline PH
    38.
    发明申请
    Methods for the preparation of para-hydroxycinnamic acid and cinnamic acid at alkaline PH 有权
    在碱性PH下制备对羟基肉桂酸和肉桂酸的方法

    公开(公告)号:US20050260724A1

    公开(公告)日:2005-11-24

    申请号:US11105259

    申请日:2005-04-13

    CPC分类号: C12P7/42 C12P7/40

    摘要: Methods for the microbial production of para-hydroxycinnamic acid (pHCA) and cinnamic acid (CA) are provided. Microbes producing either tyrosine or phenylalanine are grown in the presence of either tyrosine ammonium lyase or phenylalanine ammonium lyase respectively where some part of the fermentation is accomplished at alkaline pH. The process results in greater yields and higher rates of para-hydroxycinnamic acid (pHCA) and cinnamic acid (CA) production as compared with fermentation exclusively at physiological pH.

    摘要翻译: 提供了对羟基肉桂酸(pHCA)和肉桂酸(CA)的微生物生产方法。 生产酪氨酸或苯丙氨酸的微生物分别在酪氨酸裂解酶或苯丙氨酸铵裂解酶的存在下生长,其中部分发酵在碱性pH下完成。 与仅在生理pH下的发酵相比,该方法产生较高的产率和较高的对羟基肉桂酸(PHCA)和肉桂酸(CA)产率。

    Methods for production of p-hydroxybenzoate in bacteria
    39.
    发明授权
    Methods for production of p-hydroxybenzoate in bacteria 失效
    在细菌中生产对羟基苯甲酸酯的方法

    公开(公告)号:US07348421B1

    公开(公告)日:2008-03-25

    申请号:US10754648

    申请日:2004-01-12

    IPC分类号: C07H21/04 C12N1/21 C12N9/00

    CPC分类号: C07K14/21 C12N15/52 C12P7/42

    摘要: This invention relates to the isolation of a novel tonB operon from Pseudomonas putida. These genes are useful to render the cells more sensitive to antibiotics, toluene, pHBA, aromatic compounds, parabenes, and aromatic amino acids after inactivation with specific mutant allels or more tolerant to these compounds after overexpression with appropriate expression vector. These findings are important in the field of medicine and biotechnology and biocatalysis. In addition a screen to identify pHBA tolerant genes is provided and strains with significant tolerance to pHBA were identified. These strains are important for pHBA production.

    摘要翻译: 本发明涉及从恶臭假单胞菌中分离出一种新的tonB操纵子。 在用适当的表达载体过表达后,这些基因可用于使细胞在特异性突变体等位基因失活后对抗生素,甲苯,pHBA,芳香族化合物,对羟基苯甲酸和芳香族氨基酸更敏感或更耐受这些化合物。 这些发现在医学和生物技术和生物催化领域是重要的。 另外还提​​供了一个识别pHBA耐受基因的筛选条件,并鉴定出对pHBA具有显着耐受性的菌株。 这些菌株对pHBA生产很重要。