对与疾病相关的内解体外核酶PLD3和PLD4的结构和机制见解
Meng Yuan1, Linghang Peng2, Deli Huang2
1Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, CA 92037, USA.
Structure (London, England : 1993)
|March 27, 2024
概括
脂酶D3和D4 (PLD3/4) 是与自身免疫性疾病相关的内酶. 结构和生物化学研究揭示了它们的催化机制以及突变如何影响酶功能,为治疗设计提供了洞察力.
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:
- 内分泌体外核酶脂酶D3 (PLD3) 和脂酶D4 (PLD4) 与自身炎症和自身免疫性疾病有关.
- 了解PLD3和PLD4的结构和功能对于阐明它们在疾病发病过程中的作用至关重要.
研究的目的:
- 为了确定PLD3和PLD4的高分辨率结构.
- 阐明它们的催化活性背后的分子机制.
- 研究疾病相关突变对酶功能的影响.
主要方法:
- 使用X射线晶体学捕获PLD3和PLD4.4的apo,中间和产物状态.
- 进行生物化学测试以评估酶活性,包括ssDNA/ssRNA消化和酸酶活性.
- 对野生类型和突变酶进行了结构分析.
主要成果:
- 这些结构揭示了具有基本活性位点的链内二元体,PLD超级家族常见的催化动机 (HxKxxxxD/E),以及5o3'外核酶在ssDNA和ssRNA上的活性,由5 extquotesingle-phosphorylation抑制.
- 确定了两步"链接和释放"的催化机制,以及通过共价3-氏丁中间体的意想不到的酸酶活性.
- PLD4 具有疏水性,影响基质结合和产品释放;与疾病相关的突变体表现出减少的活性或稳定性.
结论:
- 该研究为PLD3和PLD4功能提供了详细的结构和机制见解.
- 这些发现阐明了PLD3/4与自身免疫性疾病相关的分子基础.
- 这些结果为开发针对PLD3/4相关疾病的向治疗提供了基础.
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