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杂色鲍碱性磷酸酶在DMSO溶液中的活力与构象变化的研究
Authors
廖金花
洪燕飞
陈巧
陈清西
Publication date
30 November 2005
Publisher
Abstract
以二甲亚砜(DMSO)为效应物,研究其对杂色鲍碱性磷酸酶(ALP)活力的影响,结果表明:该酶的剩余活力随着DMSO浓度增大而迅速下降,当DMSO浓度达40%,酶活力几乎完全丧失.说明DMSO对杂色鲍ALP有明显的失活作用.导致酶活力丧失50%的DMSO浓度为17%.在较低DMSO浓度(<20%)的失活是可逆的反应过程.动力学研究表明,该酶的失活过程属于混合型.进一步测定游离酶(E)和酶底物络合物(ES)与DMSO的结合常数(KI和KIS),结果表明KI<KIS,说明底物存在对酶被DMSO的失活作用有一定的保护作用.应用荧光发射光谱研究杂色鲍ALP经DMSO微扰后的分子构象变化情况,随着DMSO浓度增大,荧光强度逐渐增强,但发射峰未发生明显变化现象,说明酶分子中的生色基团残基的微环境发生了一定的变化
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Last time updated on 16/06/2016