| 摘要 |
A creatine amidinohydrolase with the following physicochemical properties is prepared: (a) action: hydrolysis of 1 mole of creatine to form 1 mole of sarcosine and 1 mole of urea; (b) substrate specificity: specific for a creatine substrate; (c) optimum pH: 7-9; (d) optimum temperature: around 35 DEG -45 DEG C.; (e) pH stability: stable in the range of pH 5.0-10.5 at 25 DEG C. for 17 hours; (f) thermal stability: stable at a temperature up to about 45 DEG C. at pH 7.5 for 30 min.; (g) inhibitors: AgNO3, HgCl2, CuSO4, etc.; and (h) molecular weight: about 80,000+/-5000 as determined by gel filtration. The creatine amidinohydrolase is stable in high pH range and possesses a small Km value, so that it can be purified in high pH range resulting in more easy and simple production than the conventional enzyme, and the lower Km value enables reduction in the period of time and in the amount of the enzyme for each measurement. The creatine amidinohydrolase is obtained by culturing Alkaligenes sp. KS-85 FERM BP-4487. |
