Cholesterol Oxidase (CHO-CE) コレステロールオキシダーゼ(CHO-CE)

  • 臨床診断用酵素

臨床検査において、各種コレステロールの測定に利用されます。

由来 recombinant E. coli
系統名

Cholesterol : oxygen oxidoreductase

EC 番号 1.1.3.6
反応式

Cholesterol + O2 →→→ Cholest-4-en-3-one + H2O2

仕様

Appearance yellow lyophilizate
Activity ≧5 U/mg lyophilizate
Contaminants catalase ≦2.0%
cholesterol esterase ≦1.0×10-2%
Stabilizer trehalose,glutamate, malate, EDTA
Storage below -20℃ protected from light

特性

Molecular weight ca. 58 kDa (gel filtration)
Structure monomer of 55 kDa (SDS-PAGE)
Michaelis constant 3.5×10-4 M (cholesterol)
pH Optimum 7.0
pH Stability 5.0–10.0
Optimum temperature 50℃
Thermal stability below 55℃
Stability (liquid form) stable at 37℃ for at least one week
Stability (powder form) stable at 30℃ for at least one month
Inhibitors ionic detergents, Ag+, Hg2+

アプリケーション

The enzyme is useful for the determination of cholesterol in clinical analysis.

参考文献

  • Shirokane, Y. et al., J. Ferment. Technol., 55, 337–346 (1977).
  • Richmond, W., Clin. Chem., 19, 1350–1356 (1973).
  • Flegg, H. M., Ann. Clin. Biochem., 10, 79–84 (1973).
  • Allain, C. C. et al., Clin. Chem., 20, 470–475 (1973).
  • Tarbutton, P. N. and Gunter, C. R., Clin. Chem., 20, 724–725 (1974).

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