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© The Rockefeller University Press, 0021-9525/1998//209 $5.00
The Journal of Cell Biology, Volume 141, Number 1, , 1998 209-225


Regular Articles

Linking Integrin {alpha}6β4-based Cell Adhesion to the Intermediate Filament Cytoskeleton: Direct Interaction between the β4 Subunit and Plectin at Multiple Molecular Sites



Günther A. Rezniczek, José M. de Pereda, Siegfried Reipert, and Gerhard Wiche

Institute of Biochemistry and Molecular Cell Biology, Vienna Biocenter, 1030 Vienna, Austria

Recent studies with patients suffering from epidermolysis bullosa simplex associated with muscular dystrophy and the targeted gene disruption in mice suggested that plectin, a versatile cytoskeletal linker and intermediate filament-binding protein, may play an essential role in hemidesmosome integrity and stabilization. To define plectin's interactions with hemidesmosomal proteins on the molecular level, we studied its interaction with the uniquely long cytoplasmic tail domain of the β4 subunit of the basement membrane laminin receptor integrin {alpha}6β4 that has been implicated in connecting the transmembrane integrin complex with hemidesmosome-anchored cytokeratin filaments. In vitro binding and in vivo cotransfection assays, using recombinant mutant forms of both proteins, revealed their direct interaction via multiple molecular domains. Furthermore, we show in vitro self-interaction of integrin β4 cytoplasmic domains, as well as disruption of intermediate filament network arrays and dislocation of hemidesmosome-associated endogenous plectin upon ectopic overexpression of this domain in PtK2 and/or 804G cells. The close association of plectin molecules with hemidesmosomal structures and their apparent random orientation was indicated by gold immunoelectron microscopy using domain-specific antibodies. Our data support a model in which plectin stabilizes hemidesmosomes, via directly interlinking integrin β4 subunits and cytokeratin filaments.


Abbreviations used in this paper: EBS-MD, epidermolysis bullosa simplex combined with muscular dystrophy; FNIII, fibronectin type III repeat; GFP, green fluorescent protein; IF, intermediate filament.

J.M. de Pereda and S. Reipert were recipients of postdoctoral fellowships from the European Community Human Capital and Mobility Program, and the Wellcome Trust, U.K., respectively. This work was supported by grants from the Austrian Science Research Fund.

Address all correspondence to Gerhard Wiche, Vienna Biocenter, Institute of Biochemistry and Molecular Cell Biology, University of Vienna, Dr. Bohr-Gasse 9, 1030 Vienna, Austria. Tel.: 43 (1) 79515-5119. Fax: 43 (1) 79515-5121. E-mail: wiche{at}abc.univie.ac.at



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