来自Coffea arabica的尿素5'-单酸盐合成酶的结构和功能特性
Alexis Hinojosa-Cruz1, Ángel G Díaz-Sánchez2, Adelaida Díaz-Vilchis3
1Departamento de Bioquímica, Facultad de Química, Universidad Nacional Autónoma de México, Ciudad de México 04510, Mexico.
International journal of biological macromolecules
|January 6, 2024
概括
研究人员鉴定了阿拉伯咖啡中的双功能UMP合成酶 (UMPS),揭示了其丁-5'-单酸脱碳酶 (ODCase) 域的结构. 这项研究增强了对植物中pyrimidine生物合成的理解.
科学领域:
- 生物化学 生物化学
- 结构生物学 结构生物学
- 植物新陈代谢 植物新陈代谢
背景情况:
- 尿素5'-单酸盐 (UMP) 合成在真核生物和植物中至关重要,涉及双功能UMP合成酶 (UMPS).
- 在植物中,UMPS包括N端的酸酸转移酶 (OPRTase) 和C端的酸丁-5'-单酸脱碳酶 (ODCase) 域.
- 了解植物UMPS的结构和功能是理解pyrimidine de novo生物合成的关键.
研究的目的:
- 从阿拉伯咖啡 (CaUMPS) 获得和描述完全功能性的重组UMPS.
- 研究CaUMPS的结构-功能关系,重点关注其两个酶域.
- 为了呈现植物ODCase域的第一个晶体结构.
主要方法:
- 全长度重组CaUMPS的生产和净化.
- 生物化学测试以确定CaOPRTase和CaODCase域的动力参数.
- 在1.4 Å分辨率下测定CaODCase域的3D结构的X射线晶体学.
主要成果:
- 成功测量了CaOPRTase和CaODCase的动力参数,并发现与现有数据可比.
- 晶体结构揭示了CaODCase形成二次体,并与其他已知的ODCase酶共享保存折叠.
- 将1 - 脱氧 - 利博5'-酸盐与CaODCase活性部位的结合诱导了一个封闭的形状.
结论:
- 这项研究为工厂UMPS的结构和功能提供了重要的见解,特别是ODCase领域.
- 这些发现有助于对植物中金胺生物合成途径的基本知识.
- 结构数据为与植物新陈代谢相关的潜在未来应用开辟了道路.
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