Tropomodulin protects α-catenin-dependent junctional-actin networks under stress during epithelial morphogenesis.

Tropomodulin protects α-catenin-dependent junctional-actin networks under stress during epithelial morphogenesis.
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DOI:
10.1016/j.cub.2012.06.025
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发表时间:
2012-08-21
期刊:
影响因子:
9.2
通讯作者:
Hardin, Jeff
Hardin, Jeff
中科院分区:
生物学1区
文献类型:
--
作者:
Cox-Paulson, Elisabeth A.;Walck-Shannon, Elise;Lynch, Allison M.;Yamashiro, Sawako;Zaidel-Bar, Ronen;Eno, Celeste C.;Ono, Shoichiro;Hardin, Jeff

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α-catenin is central to recruitment of actin networks to the cadherin-catenin complex (CCC), but how such networks are subsequently stabilized against applied stress during morphogenesis is poorly understood. To identify proteins that functionally interact with α-catenin in this process, we performed enhancer screening using a weak allele of the C. elegans α-catenin, hmp-1, and identified UNC-94/tropomodulin. Tropomodulins (Tmods) cap the minus ends of F-actin in sarcomeres. They also regulate lamellipodia, can promote actin nucleation, and are required for normal cardiovascular development and neuronal growth cone morphology. Tmods regulate the morphology of cultured epithelial cells, but their role in epithelia in vivo remains unexplored. We find that UNC-94 is enriched within a HMP-1-dependent junctional actin network at epidermal adherens junctions subject to stress during morphogenesis. Loss of UNC-94 leads to discontinuity of this network, and high-speed filming of hmp-1(fe4);unc-94(RNAi) embryos reveals large junctional displacements that depend on the Rho pathway. In vitro, UNC-94 acts in combination with HMP-1, leading to longer actin bundles than with HMP-1 alone. Our data suggest Tmods protect actin filaments recruited by α-catenin from minus-end subunit loss, enabling them to withstand the stresses of morphogenesis.
秀丽隐杆线虫P120 Catenin同源物,JAC-1,在表皮形态发生过程中调节钙粘蛋白 - 钙蛋白的功能。
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