Promotion of row 1-specific tip complex condensates by Gpsm2-Gαi provides insights into row identity of the tallest stereocilia.

Promotion of row 1-specific tip complex condensates by Gpsm2-Gαi provides insights into row identity of the tallest stereocilia.
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Gpsm2-Gαi 对第 1 行特定尖端复合物冷凝物的促进提供了对最高静纤毛的行身份的见解

DOI:
10.1126/sciadv.abn4556
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发表时间:
2022-06-10
期刊:
影响因子:
13.6
通讯作者:
--
中科院分区:
综合性期刊1区
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--
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毛细胞中的机械感觉静纤毛被组织成不同高度的行,这是听觉感知的关键特性。最高静纤毛尖端的 Gpsm2-Gαi-Whirlin-Myo15-Eps8 复合物被提议用来定义发束行身份,尽管潜在的机制仍然难以捉摸。在这里,我们发现 Gpsm2 可以发生相分离。此外,第 1 行特异性 Gpsm2-Gαi 复合物显着促进五组分尖端复合物密度 (5xTCD) 凝聚物的形成。 5xTCD 凝聚物显示出比没有 Gpsm2-Gαi 的凝聚物更强的肌动蛋白捆绑能力,这可能为 Gpsm2-Gαi 如何指定最高的静纤毛提供重要的见解。耳聋相关的 Gpsm2 突变导致 5xTCD 凝聚体的形成受损,从而减少肌动蛋白成束,这为查德利-麦卡洛综合征患者听力损失的病因学提供了可能的线索。第 1 行——特异性 Gpsm2-Gαi 介导的冷凝物丰富了肌动蛋白动态调节因子,提供了对发束行身份的见解。
The mechanosensory stereocilia in hair cells are organized into rows of graded height, a property crucial for auditory perception. Gpsm2-Gαi-Whirlin-Myo15-Eps8 complex at tips of the tallest stereocilia is proposed to define hair bundle row identity, although the underlying mechanism remains elusive. Here, we find that Gpsm2 could undergo phase separation. Moreover, row 1–specific Gpsm2-Gαi complex significantly promotes the formation of the five-component tip complex density (5xTCD) condensates. The 5xTCD condensates display much stronger actin-bundling ability than those without Gpsm2-Gαi, which may provide critical insights into how Gpsm2-Gαi specifies the tallest stereocilia. A deafness-associated mutation of Gpsm2 leads to impaired formation of the 5xTCD condensates and consequently reduced actin bundling, providing possible clues for etiology of hearing loss in patients with Chudley-McCullough syndrome. Row 1–specific Gpsm2-Gαi–mediated condensates enrich actin dynamic regulators, providing insights into hair bundle row identity.
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