DAPLE orchestrates apical actomyosin assembly from junctional polarity complexes.

DAPLE orchestrates apical actomyosin assembly from junctional polarity complexes.
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DOI:
10.1083/jcb.202111002
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发表时间:
2022-05-02
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Garcia-Marcos M
Garcia-Marcos M
中科院分区:
其他
文献类型:
--
作者:
Marivin A;Ho RX;Garcia-Marcos M

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Marivin等人展示了蛋白质DAPLE与细胞-细胞连接处的PAR极性复合物的缔合如何通过同时激活异源三聚体G蛋白和募集肌动蛋白稳定蛋白CD 2AP来维持上皮细胞中的顶端细胞骨架网络。顶基极性的建立和细胞骨架的组织必须协调运作,以确保适当的上皮细胞的形状和功能。然而,极性复合物直接指导细胞骨架机制以确定细胞形状的精确分子机制知之甚少。在这里,我们定义了一种机制,通过这种机制,PAR极性复合物(PAR 3-PAR 6-aPKC)在顶端细胞连接导致有效的组装顶端肌动球蛋白网络,以维持上皮细胞形态。我们发现,PAR极性复合物招募蛋白质DAPLE顶端细胞连接,这反过来又触发了一个双管齐下的机制,收敛后,顶端肌动球蛋白组装。更具体地说,DAPLE直接招募肌动蛋白稳定蛋白CD 2AP到顶端连接,并伴随地以GPCR非依赖性方式激活异源三聚体G蛋白信号传导,以促进RhoA-肌球蛋白激活。这些观察结果确立了DAPLE作为连接极性复合物和支持上皮细胞形状的顶端细胞骨架组装体形成之间的直接分子联系。
Marivin et al. show how association of the protein DAPLE with PAR polarity complexes at cell–cell junctions maintains an apical cytoskeletal network in epithelial cells by simultaneously activating heterotrimeric G proteins and recruiting the actin-stabilizing protein CD2AP. Establishment of apicobasal polarity and the organization of the cytoskeleton must operate coordinately to ensure proper epithelial cell shape and function. However, the precise molecular mechanisms by which polarity complexes directly instruct the cytoskeletal machinery to determine cell shape are poorly understood. Here, we define a mechanism by which the PAR polarity complex (PAR3–PAR6–aPKC) at apical cell junctions leads to efficient assembly of the apical actomyosin network to maintain epithelial cell morphology. We found that the PAR polarity complex recruits the protein DAPLE to apical cell junctions, which in turn triggers a two-pronged mechanism that converges upon assembly of apical actomyosin. More specifically, DAPLE directly recruits the actin-stabilizing protein CD2AP to apical junctions and, concomitantly, activates heterotrimeric G protein signaling in a GPCR-independent manner to favor RhoA-myosin activation. These observations establish DAPLE as a direct molecular link between junctional polarity complexes and the formation of apical cytoskeletal assemblies that support epithelial cell shape.
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