title: alpha-catenin-independent recruitment of ZO-1 to nectin-based cell-cell adhesion sites through afadin.
abstract: ZO-1 is an actin filament (F-actin)-binding protein that localizes to tight junctions and connects claudin to the actin cytoskeleton in epithelial cells. In nonepithelial cells that have no tight junctions, ZO-1 localizes to adherens junctions (AJs) and may connect cadherin to the actin cytoskeleton indirectly through beta- and alpha-catenins as one of many F-actin-binding proteins. Nectin is an immunoglobulin-like adhesion molecule that localizes to AJs and is associated with the actin cytoskeleton through afadin, an F-actin-binding protein. Ponsin is an afadin- and vinculin-binding protein that also localizes to AJs. The nectin-afadin complex has a potency to recruit the E-cadherin-beta-catenin complex through alpha-catenin in a manner independent of ponsin. By the use of cadherin-deficient L cell lines stably expressing various components of the cadherin-catenin and nectin-afadin systems, and alpha-catenin-deficient F9 cell lines, we examined here whether nectin recruits ZO-1 to nectin-based cell-cell adhesion sites. Nectin showed a potency to recruit not only alpha-catenin but also ZO-1 to nectin-based cell-cell adhesion sites. This recruitment of ZO-1 was dependent on afadin but independent of alpha-catenin and ponsin. These results indicate that ZO-1 localizes to cadherin-based AJs through interactions not only with alpha-catenin but also with the nectin-afadin system.
authors.affiliation: Department of Molecular Biology and Biochemistry, Osaka University Graduate School of Medicine/Faculty of Medicine, Suita 565-0871, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Yokoyama
authors.forename: K
authors.initials: K
authors.lastname: Tachibana
authors.forename: H
authors.initials: H
authors.lastname: Nakanishi
authors.forename: Y
authors.initials: Y
authors.lastname: Yamamoto
authors.forename: K
authors.initials: K
authors.lastname: Irie
authors.forename: K
authors.initials: K
authors.lastname: Mandai
authors.forename: A
authors.initials: A
authors.lastname: Nagafuchi
authors.forename: M
authors.initials: M
authors.lastname: Monden
authors.forename: Y
authors.initials: Y
authors.lastname: Takai
mesh_terms: D000818:Animals; D001665:Binding Sites; D015820:Cadherins / Q000378:metabolism; D002448:Cell Adhesion; D015815:Cell Adhesion Molecules / Q000737:chemistry / Q000378:metabolism; D002460:Cell Line; D002478:Cells, Cultured; D002846:Chromatography, Affinity; D003598:Cytoskeletal Proteins / Q000737:chemistry*; D003599:Cytoskeleton / Q000378:metabolism; D005822:Genetic Vectors; D006801:Humans; D016547:Kinesins; D008565:Membrane Proteins / Q000378:metabolism*; D051379:Mice; D008840:Microfilament Proteins / Q000737:chemistry* / Q000378:metabolism; D008856:Microscopy, Fluorescence; D009218:Myosins; D000075983:Nectins; D010750:Phosphoproteins / Q000378:metabolism*; D011233:Precipitin Tests; D011485:Protein Binding; D017434:Protein Structure, Tertiary; D011993:Recombinant Fusion Proteins / Q000378:metabolism; D013347:Subcellular Fractions; D014162:Transfection; D062826:Zonula Occludens-1 Protein; D051178:alpha Catenin
chemical_list: C095516:AFDN protein, human; C490657:Afdn protein, mouse; C495273:CTNNA1 protein, human; D015820:Cadherins; D015815:Cell Adhesion Molecules; C495272:Ctnna1 protein, mouse; D003598:Cytoskeletal Proteins; D008565:Membrane Proteins; D008840:Microfilament Proteins; D000075983:Nectins; D010750:Phosphoproteins; D011993:Recombinant Fusion Proteins; C569042:TJP1 protein, human; C569043:Tjp1 protein, mouse; D062826:Zonula Occludens-1 Protein; C108835:afadin; D051178:alpha Catenin; C119201:ponsin; D009218:Myosins; D016547:Kinesins