Journal
JOURNAL OF CELL BIOLOGY
Volume 220, Issue 6, Pages -Publisher
ROCKEFELLER UNIV PRESS
DOI: 10.1083/jcb.202007055
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Funding
- Juan de la Cierva fellowship [FJCI-2015-26175]
- Ministerio de Economia y Competitividad [BFU2014-53633-P, BFU2017-83562-P]
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The study reveals that β-catenin interacts with phosphorylated pro-N-cadherin in the early Golgi transit, promoting the maturation of N-cadherin. It is shown that β-catenin and Dbnl assist in the maturation of pro-N-cadherin, which is crucial for adherens junction formation and apico-basal polarity maintenance.
The neural tube forms when neural stem cells arrange into a pseudostratified, single-cell-layered epithelium, with a marked apico-basal polarity, and in which adherens junctions (AJs) concentrate in the subapical domain. We previously reported that sustained beta-catenin expression promotes the formation of enlarged apical complexes (ACs), enhancing apico-basal polarity, although the mechanism through which this occurs remained unclear. Here, we show that beta-catenin interacts with phosphorylated pro-N-cadherin early in its transit through the Golgi apparatus, promoting propeptide excision and the final maturation of N-cadherin. We describe a new beta-catenin-dependent interaction of N-cadherin with Drebrin-like (Dbnl), an actin-binding protein that is involved in anterograde Golgi trafficking of proteins. Notably, Dbnl knockdown led to pro-N-cadherin accumulation and limited AJ formation. In brief, we demonstrate that Dbnl and beta-catenin assist in the maturation of pro-N-cadherin, which is critical for AJ formation and for the recruitment AC components like aPKC and, consequently, for the maintenance of apico-basal polarity.
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