双重特异性的蛋白质酸酶VHR的晶体结构
J Yuvaniyama1, J M Denu, J E Dixon
1Biophysics Research Division and Department of Biological Chemistry, University of Michigan, Ann Arbor 48109-1055, USA.
概括
人类双特异性酸酶VHR的晶体结构揭示了一个浅处的活性部位,使广泛的基质水解成为可能. 这个结构提供了对保存的支架和DSP和PTP之间的特异性差异的见解.
科学领域:
- 生物化学 生物化学
- 结构生物学 结构生物学
- 分子生物学分子生物学
背景情况:
- 双特异性蛋白酸酶 (DSP) 是细胞信号通路的关键调节者,包括线粒发生和细胞周期进展.
- 了解DSP活动的结构基础对于阐明它们在正常生理学和疾病中的作用至关重要.
研究的目的:
- 确定人类疫苗H1相关酸酶 (VHR) 的高分辨率晶体结构,这是一个关键的DSP.
- 阐明控制VHR基底特异性的结构特征,并将其与蛋白质氨酸酸酶 (PTP) 进行比较.
主要方法:
- 采用X射线晶体学,以2.1安格斯特罗姆分辨率确定人类VHR的三维结构.
- 结构分析侧重于活跃站点架构和周围区域,以推断基质结合和催化机制.
主要成果:
- 晶体结构揭示了VHR中浅处的活性位点口袋,促进了氨酸,氨酸和氨酸酸化残留物的水解.
- 相比之下,蛋白质氨酸酸酶 (PTPs) 具有更深的活性位点,限制它们的特异性到氨酸.
- 在VHR活性部位附近的带正电荷的裂表明它在结合具有多个酸化部位的基质方面发挥了作用.
结论:
- VHR结构建立了一个由DSP和PTP共享的保存结构支架.
- 建议在VHR中建立一个不同的"识别区域",以调解DSP和PTP之间的基质特异性差异.
- 这些结构信息为了解酸酶在细胞调节中的多样性功能提供了基础.
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