Contributions of cytoplasmic domains of desmosomal cadherins to desmosome assembly and intermediate filament anchorage

Sergey M. Troyanovsky*, Leonid G. Eshkind, Regina B. Troyanovsky, Rudolf E. Leube, Werner W. Franke

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

142 Scopus citations

Abstract

To examine the potential of cytoplasmic portions ("tails") of desmosomal cadherins for assembly of desmosome plaque structures and anchorage of intermediate filaments (IFs), we transfected cultured human A-431 carcinoma cells, abundant in desmosomes and cytokeratin IFs, with constructs encoding chimeric proteins in which the transmembranous region of connexin 32 had been fused with tails of desmocollin (Dsc) or desmoglein (Dsg). The results show that the tail of the long splice form a of Dsc, but not its shorter splice form b, contains sufficient information to recruit desmoplakin and plakoglobin to connexon membrane paracrystals (gap junctions) and to form a novel kind of plaque at which cytokeratin IFs attach. By contrast, chimerase containing a Dsg tail, which accumulated in the plasma membrane, showed a dominant-negative effect: they not only were unable to form gap junction structures and plaques but also led to the disappearance of all endogenous desmosomes and the detachment of IFs from the plasma membrane.

Original languageEnglish (US)
Pages (from-to)561-574
Number of pages14
JournalCell
Volume72
Issue number4
DOIs
StatePublished - Feb 26 1993

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)

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