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IRSp53 controls plasma membrane shape and polarized transport at the nascent lumen in epithelial tubules.

Abstract：

:It is unclear whether the establishment of apical-basal cell polarity during the generation of epithelial lumens requires molecules acting at the plasma membrane/actin interface. Here, we show that the I-BAR-containing IRSp53 protein controls lumen formation and the positioning of the polarity determinants aPKC and podocalyxin. Molecularly, IRSp53 acts by regulating the localization and activity of the small GTPase RAB35, and by interacting with the actin capping protein EPS8. Using correlative light and electron microscopy, we further show that IRSp53 ensures the shape and continuity of the opposing plasma membrane of two daughter cells, leading to the formation of a single apical lumen. Genetic removal of IRSp53 results in abnormal renal tubulogenesis, with altered tubular polarity and architectural organization. Thus, IRSp53 acts as a membrane curvature-sensing platform for the assembly of multi-protein complexes that control the trafficking of apical determinants and the integrity of the luminal plasma membrane.

journal_name

Nat Commun

journal_title

Nature communications

authors

Bisi S,Marchesi S,Rizvi A,Carra D,Beznoussenko GV,Ferrara I,Deflorian G,Mironov A,Bertalot G,Pisati F,Oldani A,Cattaneo A,Saberamoli G,Pece S,Viale G,Bachi A,Tripodo C,Scita G,Disanza A

doi

10.1038/s41467-020-17091-x

subject

Has Abstract

pub_date

2020-07-14 00:00:00

pages

3516

issue

1

issn

2041-1723

pii

10.1038/s41467-020-17091-x

journal_volume

11

pub_type

杂志文章

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