抄録
It is established that the both hydrolytic and esterified cholesterol esterase systems exist in the suprarenal bodies of male and female rats. Its nature is as follows;
1. The esterifying activity of the enzyme is stronger than its hydrolytic ractivity.
2. The optimum pH of the enzyme stands between 6.8 and 7.0 (6.9).
3. The enzyme is activated by bile salts.
4. Each activity of both enzyme systems is enhanced in proportion to its concentration and is inhibited in the presence of the products of the reaction in proportion to their concentrations.
The author wishes to express his thanks to Prof. Raijiro Taka hashi for his interest and encouragement. Thanks are also due to Mr. Atsushi Irizawa, Mr. Mr. Takeo Tanaka and Mr. Shigeki Umezane for their able collaborations in the course of these experiments.
And this work has been partly supported by a grant in aid for the Miscellaneous Scientific Research from the Ministry of Education in 1953.
