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互动组查表明,BAG6是ALS-痴呆症中UBQLN2错折的抑制剂

Sang Hwa Kim, Claire E Boos, Mark Scalf

bioRxiv : the preprint server for biology

|November 24, 2025

概括

与ALS/FTD相关的乌比基林-2 (UBQLN2) 突变破坏了蛋白质的功能. 研究人员确定BAG6是UBQLN2保持酶,对蛋白质溶解性和循环至关重要,影响疾病病理学.

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
遗传学遗传学是一个

背景情况:

乌比基林-2 (UBQLN2) 是一种泛基素结合蛋白,在突变时涉及肌缩侧面硬化症 (ALS) 和前性痴呆症 (FTD).
UBQLN2中的突变可以通过功能丧失和功能获取机制导致蛋白质错误折叠,聚合和细胞功能障碍.

研究的目的:

研究ALS相关突变如何影响UBQLN2的相互作用和细胞作用.
识别与野生型和突变UBQLN2相互作用的蛋白质,特别是在细胞应激的背景下.

主要方法:

基于定量质谱的互动组分析对来自诱导多能干细胞 (iPSC) 和诱导运动神经元 (iMN) 的亲和度净化UBQLN2进行了分析.
细胞表达野生型UBQLN2 (UBQLN2WT),临床突变 (UBQLN2P497H) 或四重突变等位基因 (UBQLN24XALS).
对于BAG6和UBQLN2,采用了淘汰和淘汰策略,以评估它们在蛋白质循环和可溶性中的作用.

主要成果:

与ALS突变UBQLN2相关性增加的蛋白质包括PEG10和BAG6.
BAG6的淘汰破坏了热应激后UBQLN2的可溶性恢复,将BAG6确定为UBQLN2保持酶.
BAG6和UBQLN2参与了PEG10的转化,而UBQLN24XALS突变显示了增加的PEG10结合和延迟的转化.

结论:

BAG6 作为UBQLN2 的酶起作用,有助于在压力下保持蛋白质溶解性.
由于UBQLN2突变,与PEG10和BAG6等蛋白质的改变相互作用可能有助于UBQLN2相关的ALS/FTD的发病.
这些发现提供了对UBQLN2相关神经退行性疾病背后的分子机制的见解.

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