由PCMTD1 cullin-RING E3 ubiquitin ligase识别L-isoaspartyl含有的蛋白质的结构基础
Eric Z Pang1, Boyu Zhao1, Cameron Flowers1
1Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA 90095, USA.
bioRxiv : the preprint server for biology
|June 6, 2025
概括
随着年龄的增长,由L-isoaspartyl残留产生的蛋白质损伤会累积起来. 这项研究揭示了PCMTD1,一种库林-RING连酶 (CRL),作为维持蛋白质完整性和生物生存的新机制.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 结构生物学 结构生物学
背景情况:
- 随着年龄的增长,自发的蛋白质损伤,以L-异亚斯帕提尔残留物形成为特征,会累积起来.
- 维持蛋白质组的稳定性对于生物的生存至关重要.
- 通过PCMT1介导的甲基化是已知的L-异亚斯巴提尔损伤修复途径.
研究的目的:
- 为了研究超出PCMT1.1的L-isoaspartyl维护的替代机制.
- 阐明PCMTD1,一个库林-RING连酶 (CRL) 在蛋白质损伤修复中的作用.
- 了解PCMTD1CRL复合体的结构和功能方面.
主要方法:
- 低温电子显微镜 (cryo-EM) 是一种电子显微镜.
- 原生质谱学原生质谱学.
- 生物化学测定 生物化学测定
主要成果:
- 组装了PCMTD1 CRL复合体,并对其架构进行了表征.
- 当PCMTD1 CRL复合物与AdoMet结合时,它会特别结合L-isoaspartyl残留物.
- 这确定了一种用于损坏蛋白质降解的新型E3泛基因酶通路.
结论:
- PCMTD1作为E3泛基因酶起作用,为L-isoaspartyl损伤维护提供了替代途径.
- 这一发现扩大了已知的细胞蛋白质稳定和衰老机制.
- 这些发现突显了E3泛素酶在识别和向自发修饰的蛋白质中的作用.
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