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  • Afadin regulates actomyosin organization through αE-catenin at adherens junctions.

Afadin regulates actomyosin organization through αE-catenin at adherens junctions.

The Journal of cell biology (2020-04-01)
Shotaro Sakakibara, Kiyohito Mizutani, Ayumu Sugiura, Ayuko Sakane, Takuya Sasaki, Shigenobu Yonemura, Yoshimi Takai
ABSTRACT

Actomyosin-undercoated adherens junctions are critical for epithelial cell integrity and remodeling. Actomyosin associates with adherens junctions through αE-catenin complexed with β-catenin and E-cadherin in vivo; however, in vitro biochemical studies in solution showed that αE-catenin complexed with β-catenin binds to F-actin less efficiently than αE-catenin that is not complexed with β-catenin. Although a "catch-bond model" partly explains this inconsistency, the mechanism for this inconsistency between the in vivo and in vitro results remains elusive. We herein demonstrate that afadin binds to αE-catenin complexed with β-catenin and enhances its F-actin-binding activity in a novel mechanism, eventually inducing the proper actomyosin organization through αE-catenin complexed with β-catenin and E-cadherin at adherens junctions.

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