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关于由人类维生素K依赖的碳酸酶对二碳酸介导的碳酸的结构洞察

Ke Wu¹, Zheng Wang¹, Deqiang Yao¹

¹Institute of Aging and Tissue Regeneration, Renji Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China.

Nature communications

|November 25, 2025

概括

研究人员揭示了酶-氨基氧化酶 (GGCX) 的结构,该酶对维生素K依赖 (VKD) 蛋白质成熟至关重要. 这一发现有助于开发新的抗凝剂和二氧化碳捕获方法.

科学领域:

生物化学生物化学
结构生物学结构生物学
分子机制的分子机制

背景情况:

维生素K依赖性 (VKD) 炭化对于蛋白质成熟至关重要,影响血液凝固,骨代谢和血管化.
-氨基氧酶 (GGCX) 是调解这种必不可少的氧化过程的关键酶.

研究的目的:

阐明人类GGCX在自由状态和与基质和抑制剂复合的结构机制.
了解GGCX基质识别,催化机制和维生素K结合的分子基础.
为了揭示由GGCX捕获和利用二氧化碳 (CO2) 的保存机制.

主要方法:

使用冷电子显微镜 (cryo-EM) 来确定人类GGCX的高分辨率结构.
结构分析仅对GGCX进行,并与VKD蛋白,维生素K和抑制剂阿尼辛复合.

主要成果:

详细的结构揭示了GGCX如何通过蛋白质结合和像骨素这样的蛋白质的二次异位体来识别各种VKD基质.
一种保存的二定机制确保了谷氨酸残留物的过程性碳氧化.
体形状的变化促进了维生素K和谷氨酸基质的协调结合.
确定了一种通用的二氧化碳介导的二氧化碳捕获机制,从细菌保存到真核生物.

结论:

这些结构性见解为设计通过抑制GGCX.X的向抗凝药物提供了基础.
这些发现为开发新的二氧化碳固定和利用的酶策略开辟了道路.
这项研究强调了GGCX中二氧化碳介导的二氧化碳捕获机制的古老和普遍性.

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