Chemical modification studies showed that the sulfhydryl, guanido, amino, carboxyl and indolyl groups may participate in the active center of the enzyme.
化学修饰实验发现：巯基、胍基、氨基、羧基和吲哚基可能参与酶活性中心的组成。
Modification of histidine residue did not change the activity of enzyme and its fluorescence emission peak intensity.
组氨酸残基被修饰后酶活力基本不变，酶的荧光强度也不改变。
Modification of histidine residue did not change the activity of the enzyme and its fluorescence emission peak intensity.
组氨酸残基被修饰后酶活力基本不变，酶的荧光强度也不改变。
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