Purification of the mannitol-i-phosphate dehydrogenase of Escherichia coli

Leiv Klungsøyr
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引用次数: 12

Abstract

  • 1.

    1. Mannitol-i-phosphate dehydrogenase (d-mannitol-i-phosphate: NAD+ oxidoreductase, EC 1.1.1.17) was purified by a simple procedure from mannitol-grown Escherichia coli.

  • 2.

    2. The active protein was apparently homogeneous in the ultracentrifuge, with a molecular weight of 25 000. At pH 9.0 the Km for mannitol i-phosphate was 3.1·10−4M, and the Km for NAD+ was 1.4·10−4M. At pH 7.0 the Km for fructose 6-phosphate was 1.6·10−4M, while that for NADH was 4.2·10−6M. Adenosine phosphates inhibited the enzyme reaction in both directions.

  • 3.

    3. In mannitol-grown E. coli, mannitol-i-phosphate dehydrogenase may account for nearly 2% of the total soluble protein.

大肠杆菌甘露醇-磷酸脱氢酶的纯化
1.1. 甘露醇-磷酸脱氢酶(d-甘露醇-磷酸:NAD+氧化还原酶,EC 1.1.1.17)通过简单的程序从甘露醇培养的大肠杆菌中纯化。活性蛋白在超离心条件下均质,分子量为25 000。pH为9.0时甘露醇i-磷酸的Km为3.1·10−4M, NAD+的Km为1.4·10−4M。pH 7.0时,果糖6-磷酸的Km为1.6·10−4M, NADH的Km为4.2·10−6M。磷酸腺苷在两个方向上都抑制酶的反应。在甘露醇培养的大肠杆菌中,甘露醇-磷酸脱氢酶可能占可溶性蛋白总量的近2%。
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