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    • 1. 发明公开
    • 절단형 글루타메이트 디카르복실라아제 변이체
    • 截断谷氨酸脱羧酶突变体
    • KR1020070014867A
    • 2007-02-01
    • KR1020050069849
    • 2005-07-29
    • (주)바이오벤변유량
    • 김하나변유량이상재홍영호이동우최은아김성보조은아조석철국무창최찬익김도윤
    • C12N15/60
    • Truncated glutamate decarboxylase mutants are provided to produce a large quantity of GABA(gamma-aminobutyric acid) through cell immobilization due to having active function at wider range of pH. The truncated glutamate decarboxylase mutant comprises a part of the amino acid sequence of SEQ ID NO:2, wherein the C-terminal of SEQ ID NO:2 is partially deleted in order to inhibit formation of a loop in the C-terminal at neutral pH and the number of amino acid residues deleted from the C-terminal is 1-25. The truncated glutamate decarboxylase mutant is characterized in that it is acid-independent, and shows activity in the range of pH 4.0-9.0. The GABA is produced by contacting the truncated glutamate decarboxylase mutant with glutamate or glutamate salt as a substrate.
    • 提供截短的谷氨酸脱羧酶突变体以通过细胞固定产生大量的GABA(γ-氨基丁酸),这是由于在较宽的pH范围内具有活性的功能。 截短的谷氨酸脱羧酶突变体包含SEQ ID NO:2的氨基酸序列的一部分,其中SEQ ID NO:2的C末端被部分缺失以抑制在中性pH下C-末端中的环的形成 并且从C末端缺失的氨基酸残基的数目为1-25。 截短的谷氨酸脱羧酶突变体的特征在于其与酸无关,并且在pH 4.0-9.0的范围内显示出活性。 通过使截短的谷氨酸脱羧酶突变体与谷氨酸盐或谷氨酸盐作为底物接触来产生GABA。
    • 6. 发明公开
    • 글루타메이트 디카르복실라아제를 이용한 생물전환공정에의한 GABA의 제조방법
    • 通过使用谷氨酸脱羧酶生物反应制备GABA的方法
    • KR1020070014858A
    • 2007-02-01
    • KR1020050069838
    • 2005-07-29
    • (주)바이오벤변유량
    • 김하나변유량이상재홍영호이동우이동윤김성보조석철국무창강민수최찬익
    • C12P13/04
    • A method for preparing GABA(gamma-aminobutyric acid) through bioconversion by using glutamate decarboxylase is provided to increase production quantity of GABA(gamma-aminobutyric acid) and reduce preparation costs with glutamate decarboxylase produced from microorganisms. The GABA(gamma-aminobutyric acid) is prepared by contacting glutamate decarboxylase isolated and purified from a microorganism with glutamate or glutamate salt as a substrate, wherein the microorganism is Escherichia coli, Lactobacillus, Listeria, yeast, Bacteroides, Debaryomyces, Mycobacterium, Aspergillus, Lactococcus or Candida; the glutamate decarboxylase comprises the total or part of the amino acid sequence of SEQ ID NO:2; the glutamate decarboxylase comprising a part of the amino acid sequence of SEQ ID NO:2 contains the partially deleted C-terminal in order to inhibit formation of a loop in the C-terminal at neutral pH; the reaction temperature is 35-60 deg.C and reaction pH is 4.0-5.0; the substrate of glutamate decarboxylase is MSG(monosodium glutamate); and the glutamate decarboxylase is immobilized into a solid support.
    • 提供通过使用谷氨酸脱羧酶通过生物转化制备GABA(γ-氨基丁酸)的方法,以增加由微生物产生的谷氨酸脱羧酶的GABA(γ-氨基丁酸)的产生量并降低制备成本。 通过将从微生物分离和纯化的谷氨酸脱羧酶与谷氨酸盐或谷氨酸盐作为底物接触来制备GABA(γ-氨基丁酸),其中微生物是大肠杆菌,乳杆菌属,李斯特菌属,酵母菌,拟杆菌属,德巴利酵母属,分枝杆菌属,曲霉属, 乳球菌或念珠菌; 谷氨酸脱羧酶包含SEQ ID NO:2的氨基酸序列的全部或部分; 包含SEQ ID NO:2的氨基酸序列的一部分的谷氨酸脱羧酶含有部分缺失的C-末端,以便在中性pH下抑制C-末端环的形成; 反应温度为35-60℃,反应pH为4.0-5.0; 谷氨酸脱羧酶底物为MSG(谷氨酸钠); 并将谷氨酸脱羧酶固定在固体支持物中。
    • 7. 发明公开
    • 호열성 및 호산성 아라비노스 이성화효소 및 그를 이용한 타가토스의 제조방법
    • 可疑和酸性阿拉伯糖异构体及其制备标签的方法
    • KR1020040058544A
    • 2004-07-05
    • KR1020020084822
    • 2002-12-27
    • 변유량
    • 이상재이동우김병찬최은아홍영호김성보변유량
    • C12N9/90
    • C12N9/90C12N15/70C12P19/02C12Y503/01003
    • PURPOSE: Thermostable and acidophilic arabinose isomerase and a process for preparing tagatose using the same are provided, which recombinant arabinose isomerase has improved acid and heat resistance, prepares tagatose in higher yield under acid condition, and minimize preparation of by-products when tagatose is prepared under acid condition. CONSTITUTION: The thermostable and acidophilic arabinose isomerase has the following properties: (i) optimal temperature of 50 to 80 deg.C, (ii) optimal pH of 5.0 o 7.0, (iii) molecular weight of 56 kDa, and (iv) 50% or more activity at pH 5, wherein the arabinose isomerase is isolated from Alicyclobacillus acidocaldarius. The process for preparing tagatose comprises the steps of: constructing a vector containing the nucleotide sequence set forth in SEQ ID NO: 1 encoding the arabinose isomerase having the amino acid sequence set forth in SEQ ID NO: 2; transforming a host cell with the vector to produce a transformant; culturing the transformant to produce arabinose isomerase; and contacting the arabinose isomerase with galactose at pH 4.0 to 7.0 and 40 to 85 deg.C.
    • 目的:提供热稳定性和嗜酸性阿拉伯糖异构酶和使用其制备塔格糖的方法,该重组阿拉伯糖异构酶具有改善的耐酸和耐热性,在酸性条件下以更高的产率制备塔格糖,并且在制备塔格糖时最小化副产物的制备 在酸性条件下。 构成:热稳定和耐酸性的阿拉伯糖异构酶具有以下性质:(i)最佳温度为50至80摄氏度,(ii)最佳pH为5.0至7.0,(iii)分子量为56kDa,(iv)为50 在pH5下具有%或更多的活性,其中阿拉伯糖异构酶从酸性脂环酸杆菌中分离出来。 制备塔格糖的方法包括以下步骤:构建含有编码具有SEQ ID NO:2所示氨基酸序列的阿拉伯糖异构酶的SEQ ID NO:1所示的核苷酸序列的载体; 用载体转化宿主细胞以产生转化体; 培养转化体以产生阿拉伯糖异构酶; 并将阿拉伯糖异构酶与pH 4.0至7.0和40至85℃的半乳糖接触。