强迫诱导的脱化激活了cochaperone BAG3,以协调蛋白质稳态和膜流量
Judith Ottensmeyer1, Alessandra Esch1, Henrique Baeta2
1Institute for Cell Biology, University of Bonn, Ulrich-Haberland-Str. 61a, 53121 Bonn, Germany.
Current biology : CB
|August 24, 2024
概括
机械应力使BAG3蛋白脱,调节伴侣辅助选择性自 (CASA) 和肌肉蛋白质组的维护. 这个过程涉及RAB GTPases,对于肌肉健康和某些神经病变至关重要.
科学领域:
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
- 肌肉生理学 肌肉生理学
背景情况:
- 骨和心脏肌肉中的蛋白质组维护依赖于伴侣调节蛋白BAG3.
- 降低BAG3活性与肌肉衰弱和心力衰竭有关.
- 在此之前,依赖力 BAG3 调节的分子机制尚不清楚.
研究的目的:
- 阐明BAG3.3的依赖力调节.
- 为了确定参与BAG3介导的伴侣辅助选择性自 (CASA) 的分子参与者.
- 研究BAG3及其相互作用因子在肌肉健康和疾病中的作用.
主要方法:
- 在人体肌肉和孤立细胞上施加机械应力.
- 基蛋白分析以确定酸化位点.
- 差异蛋白质组学来发现BAG3相互作用体.
- 功能性测试以评估CASA活性和线粒细胞衰变.
主要成果:
- 机械应力通过力调节的光开关诱导BAG3脱化.
- RAB GTPases,特别是RAB7A和RAB11B,是脱酸化依赖的相互作用体,对骨肌肉中的CASA至关重要.
- BAG3脱化和RAB7A合作参与受损线粒体的线粒体衰变.
- BAG3和RAB7A还在非肌肉细胞中合作,这对夏科特-玛丽-图斯神经病变有影响.
结论:
- 机械应力通过脱化调节BAG3活动,控制CASA.
- RAB GTPases是BAG3在肌肉蛋白质稳定和线粒细胞衰变中的关键作用者.
- 涉及BAG3和RABA7A的失调CASA可能会导致Charcot-Marie-Tooth疾病的神经退行.
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