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Updated: Jan 10, 2026

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Detection of Protein Ubiquitination
Published on: August 19, 2009
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通过促进乌比基参与,Faf1加速了p97介导的蛋白质展开
Zengwei Liao1,2,3, Connor Arkinson1,2,3, Andreas Martin1,2,3,4
1California Institute for Quantitative Biosciences, University of California at Berkeley, Berkeley, CA 94720, USA.
bioRxiv : the preprint server for biology
|November 24, 2025
概括
蛋白质展开酶p97/VCP,与辅因子Faf1,通过增强初始的泛素展开和运动参与,加速泛素链处理. Faf1稳定了Ufd1-Npl4辅因子,揭示了p97基质选择的复杂调节.
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:
- P97/VCP (含瓦洛辛蛋白) 是一个关键的AAA+ ATPase unfoldase,参与DNA复制和蛋白质降解.
- 像Ufd1-Npl4这样的辅因子调解了p97/VCP在加工无素基质中的功能.
- 已知Faf1在增强p97 / VCP活动中的作用,特别是在复杂体分解中,但其机制尚不清楚.
研究的目的:
- 阐明Faf1增强p97/VCP介导的乌比奎丁展开的分子机制.
- 为了研究Faf1在Ufd1-Npl4辅因子和无处不在的蛋白质基质中扮演的角色.
- 了解Faf1的辅因子稳定和基质处理功能的结构基础.
主要方法:
- 使用人类成分进行体外生化复制.
- 突变分析以确定关键的残留物和域.
- 基于Förster共振能量转移 (FRET) 的测试来监测展开的动态.
- 电子显微镜 (cryo-EM) 用于结构的确定.
主要成果:
- 一般来说,Faf1通过促进初始的ubiquitin展开和ATPase运动参与,加速了依赖于ubiquitin的基质加工.
- Faf1利用其UBX域稳定一个螺旋,支Ufd1的UT3域,从而稳定了Ufd1-Npl4辅因子.
- 这种稳定有助于由p97/VCP复合体展开无处不在的基质.
结论:
- Faf1充当了p97/VCP的泛基增强剂的作用.
- Faf1的机制涉及稳定Ufd1-Npl4辅因子,从而实现高效的基质加工.
- 这些发现强调了与酵母Cdc48.48.相比,p97/VCP基质选择的复杂调节机制.
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