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    • 3. 发明授权
    • Methods and compositions for quantitating L-homocysteine and/or
l-methionine in a solution
    • 在溶液中定量L-高半胱氨酸和/或1-甲硫氨酸的方法和组合物
    • US5885767A
    • 1999-03-23
    • US83459
    • 1998-05-22
    • J. David Rozzell, Jr.
    • J. David Rozzell, Jr.
    • C12Q1/25C12Q1/48C12Q1/527G01N33/68C12Q1/00C12Q1/37C12Q1/54
    • C12Q1/25C12Q1/48C12Q1/527G01N33/6815
    • A method for quantitating L-homocysteine and/or L-methionine in a solution involves contacting a solution containing L-homocysteine and/or L-methionine with a reagent comprising methionine gamma-lyase and a cofactor capable of forming a Schiff base with the L-methionine and/or L-homocysteine for a time sufficient to catalyze the conversion of L-homocysteine and/or L-methionine to 2-ketobutyrate. The amount of 2-ketobutyrate formed is determined, and the amount of L-homocysteine and/or L-methionine present in the original solution can be determined based on the amount of 2-ketobutyrate formed. A composition for measuring the amount of L-homocysteine and/or L-methionine in a solution comprises methionine gamma-lyase, a cofactor capable of forming a Schiff base with the L-methionine and/or L-homocysteine and at least one 2-ketobutyrate detecting agent, but is substantially free of L-methionine, L-homocysteine, 2-ketobutyrate, pyruvate and mercury.
    • 在溶液中定量L-高半胱氨酸和/或L-甲硫氨酸的方法包括将含有L-高半胱氨酸和/或L-甲硫氨酸的溶液与含有甲硫氨酸γ-裂合酶的试剂和能够与L形成席夫碱的辅因子接触 - 甲硫氨酸和/或L-高半胱氨酸的时间足以催化L-高半胱氨酸和/或L-甲硫氨酸向2-酮丁酸转化。 确定形成的2-酮基丁酸酯的量,并且可以基于形成的2-酮基丁酸酯的量来确定原始溶液中存在的L-高半胱氨酸和/或L-甲硫氨酸的量。 用于测量溶液中L-高半胱氨酸和/或L-甲硫氨酸的量的组合物包含甲硫氨酸γ-裂解酶,能够与L-甲硫氨酸和/或L-高半胱氨酸形成希夫碱的辅因子和至少一种2- 酮基丁酸酯检测剂,但基本上不含L-甲硫氨酸,L-高半胱氨酸,2-酮丁酸酯,丙酮酸和汞。