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验证性筛选PDZ结构域结合配体文库快速研究HtrA2/Omi PDZ结构域的结合特性 被引量:2

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摘要 HtrA2/Omi是一种线粒体丝氨酸蛋白酶,在哺乳动物细胞中具有双重功能,即诱导细胞凋亡和参与维持线粒体活性的动态平衡.PDZ结构域是最重要的蛋白质相互作用结构域之一,参与多种生物学过程,如细胞信号转导、蛋白质降解、细胞骨架组织等.最近研究发现,HtrA2/Omi蛋白的PDZ结构域与配体的相互作用,可以调节HtrA2/Omi蛋白自身的水解酶活性.以HtrA2/Omi PDZ结构域为研究对象,用酵母双杂交系统验证性筛选PDZ结构域结合配体文库,快速研究该结构域的结合特性,并在人类全蛋白质组范围内预测并发现该结构域新的相互作用蛋白,最后分析这些新的相互作用所能够形成的最小相互作用网络来评估其可信度.研究结果揭示了HtrA2/Omi PDZ结构域新的结合特性,即:不仅能够结合已报道的II类PDZ配体而且还可以结合I类和III类PDZ配体,并且配体-3位氨基酸具有一定范围内的可变性.而且,发现了7个新的HtrA2/Omi PDZ结构域相互作用蛋白,为进一步阐明HtrA2/Omi蛋白的生物学功能提供了重要线索.同时证明了验证性筛选目的结构域结合配体文库,这一结构域结合特性研究新策略的实用性和高效性.
出处 《中国科学(C辑)》 CSCD 北大核心 2007年第1期107-116,共10页 Science in China(Series C)
基金 国家重点基础研究发展计划("973"项目)(2004CB520804) 国家高科技研究发展计划("863"项目)(2006AA02Z308) 国家自然科学基金(批准号:30270657 30230150 3037030) 北京市自然科学基金(5072037)
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