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The C. elegans MAGI-1 protein is a novel component of cell junctions that is required for junctional compartmentalization


Stetak, A; Hajnal, A (2011). The C. elegans MAGI-1 protein is a novel component of cell junctions that is required for junctional compartmentalization. Developmental Biology, 350(1):24-31.

Abstract

Cell junctions are essential to maintain polarity and tissue integrity. Epithelial cell junctions are composed of distinct sub-compartments that together ensure the strong adhesion between neighboring cells. In Caenorhabditis elegans epithelia, the apical junction (CeAJ) forms a single electron-dense structure, but at the molecular level it is composed of two sub-compartments that function redundantly and localize independently as two distinct but adjacent circumferential rings on the lateral plasma membrane. While investigating the role of the multi PDZ-domain containing protein MAGI-1 during C. elegans epidermal morphogenesis, we found that MAGI-1 localizes apical to both the Cadherin/Catenin (CCC) and AJM-1/DLG-1 (DAC) containing sub-domains. Removal of MAGI-1 function causes a loss of junctional compartmentalization along the lateral membrane and reduces the overall robustness of cell-cell adhesion mediated by either type of cell junctions. Our results suggest that MAGI-1 functions as an "organizer" that ensures the correct segregation of different cell adhesion complexes into distinct domains along the lateral plasma membrane. Thus, the formation of stable junctions requires the proper distribution of the CCC and DAC adhesion protein complexes along the lateral plasma membrane.

Cell junctions are essential to maintain polarity and tissue integrity. Epithelial cell junctions are composed of distinct sub-compartments that together ensure the strong adhesion between neighboring cells. In Caenorhabditis elegans epithelia, the apical junction (CeAJ) forms a single electron-dense structure, but at the molecular level it is composed of two sub-compartments that function redundantly and localize independently as two distinct but adjacent circumferential rings on the lateral plasma membrane. While investigating the role of the multi PDZ-domain containing protein MAGI-1 during C. elegans epidermal morphogenesis, we found that MAGI-1 localizes apical to both the Cadherin/Catenin (CCC) and AJM-1/DLG-1 (DAC) containing sub-domains. Removal of MAGI-1 function causes a loss of junctional compartmentalization along the lateral membrane and reduces the overall robustness of cell-cell adhesion mediated by either type of cell junctions. Our results suggest that MAGI-1 functions as an "organizer" that ensures the correct segregation of different cell adhesion complexes into distinct domains along the lateral plasma membrane. Thus, the formation of stable junctions requires the proper distribution of the CCC and DAC adhesion protein complexes along the lateral plasma membrane.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute of Molecular Life Sciences
Dewey Decimal Classification:570 Life sciences; biology
Uncontrolled Keywords:Adhesion C. elegans
Language:English
Date:2011
Deposited On:08 Feb 2011 11:33
Last Modified:05 Apr 2016 14:37
Publisher:Elsevier
ISSN:0012-1606
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1016/j.ydbio.2010.10.026
PubMed ID:21034729
Permanent URL: https://doi.org/10.5167/uzh-43025

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