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通过BAG3和HSP70引导的与actin结合蛋白的共同聚合,形成了TDP-43骨状的内含物
Shan Lu1,2, Sitao Zhang3, Spencer Oung3
1Department of Cellular and Molecular Medicine, University of California, San Diego, San Diego, CA, USA. ms.shanlu@gmail.com.
Nature cell biology
|November 1, 2025
概括
RNA结合蛋白TDP-43在神经退行性疾病中形成不同的聚合物. 它的自我氧化和与菲拉胺和BAG3等蛋白质的相互作用影响聚合物的类型和毒性.
科学领域:
- 神经科学是一个神经科学.
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- 在神经退行性疾病中,TDP-43形成了独特的细胞质聚合物.
- 这些聚合物的形态不同,包括骨状,颗粒状和球形的包裹.
研究的目的:
- 研究驱动不同TDP-43聚合物形态的形成的分子机制.
- 确定调节TDP-43聚合和相关毒性的细胞因子和途径.
主要方法:
- 近距离标记-质谱测量以识别细胞应激下TDP-43相互作用蛋白.
- 在Drosophila中进行RNA干扰 (RNAi),以评估已识别的相互作用体的体内作用.
- 生物化学试验研究TDP-43的自我氧化和与伴侣的相互作用.
主要成果:
- TDP-43 N端的自我寡合化调节了脱成细胞质液滴的过程,并在抑制后促进了骨状的内含.
- 细胞应激会通过BAG3和BAG2.2诱导TDP-43与actin结合蛋白 (filamins,α-actinin) 的结合.
- 菲拉胺-TDP-43的相互作用增强了细胞毒性,而其在Drosophila中的减少改善了细胞损失.
- BAG3 调节了活性蛋白结合蛋白的蛋白质稳定,而 BAG2 则促进了小的,圆形的 TDP-43 入.
结论:
- TDP-43的自我寡合化及其与伴侣蛋白 (HSP70,BAG2,BAG3) 和活性蛋白结合蛋白的相互作用共同推动了多种TDP-43含量的形成.
- 针对这些相互作用可能为TDP-43蛋白病变提供治疗策略.
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