机构地区: 南京农业大学食品科技学院
出 处: 《分子催化》 2007年第6期556-560,共5页
摘 要: 通过不同阳离子和不同阴离子对唾液链球菌嗜热亚种(Streptococcus salivariussub sp.thermophilus)谷氨酸脱羧酶活性的影响以及NaNO3对不同蛋白质浓度的谷氨酸脱羧酶活性的影响进行考察,结果表明:中性盐对谷氨酸脱羧酶活性的影响不是由于增加蛋白质亚基间的疏水作用引起的,而可能是由中性盐对谷氨酸脱羧酶活性的弱抑制作用与中性盐增加了谷氨酸脱羧酶的胶体体系稳定性共同作用所致,同时还可能与中性盐降低了反应体系CO2的溶解度有关. The mechanism of the effects of neutral salts on the activity of Streptococcus salivarius subsp, thermophilus glutamate decarboxylase (GAD) was discussed. Through the investigations of various cations and anions on GAD ac that the tivity, and the effects of NaNO3 on GAD activity at various protein concentrations respectively, it was found activation of neutral salts on GAD activity was the results of co-actions of weak inhibition and increasing the colloidal system's stability of GAD rather than the increase of hydrophobic interaction between subunits of GAD. Beides, the activation of neutral salts on GAD activity, to a degree, might be owed to the reduction of CO2 solubility by salts.
关 键 词: 谷氨酸脱羧酶 唾液链球菌嗜热亚种 盐 机制 疏水作用
领 域: [理学]