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Cytolinker cross-talk : periplakin n-terminus interacts with plectin to regulate keratin organisation and epithelial migration.

Boczonadi, V. and McInroy, L. and Maatta, A. (2007) 'Cytolinker cross-talk : periplakin n-terminus interacts with plectin to regulate keratin organisation and epithelial migration.', Experimental cell research., 313 (16). pp. 3579-3591.


Periplakin is a cytoskeletal linker protein that participates in the assembly of epidermal cell cornified envelope and regulates keratin organisation in simple epithelial cells. We have generated a stably transfected MCF-7 subclone expressing HA-tagged periplakin N-terminus to identify molecular interactions of periplakin. Co-immunoprecipitation with anti-HA antibodies and mass spectrometry identified a 500-kDa periplakin-interacting protein as plectin, another plakin family member. Plectin–periplakin interaction was confirmed by immunoblotting of complexes immunoprecipitated by either anti-HA or anti-plectin antibodies. Transient transfections of periplakin deletion constructs indicated that first 133 amino acid residues of the N-terminus are sufficient for co-localisation with plectin at MCF-7 cell borders. Immunofluorescence analysis demonstrated that periplakin and plectin isoforms 1, 1f and 1k co-localise at cell borders of MCF-7 epithelia and that plectin-1f and 1k co-localise with periplakin in suprabasal epidermis. Ablation of plectin by siRNA in HaCaT keratinocytes resulted in aggregation of periplakin to small clusters. Scratch-wounded MCF-7 epithelia expressing periplakin N-terminus showed accelerated keratin re-organisation that was inhibited by siRNA knock-down of plectin. Finally, ablation of either periplakin or plectin, or both proteins simultaneously, impaired migration of MCF-7 epithelial sheets. Thus, we have identified a novel functional co-localisation between two plakin cytolinker proteins.

Item Type:Article
Keywords:Plectin, Periplakin, Epithelial migration, Intermediate filaments.
Full text:Full text not available from this repository.
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Date accepted:No date available
Date deposited:No date available
Date of first online publication:October 2007
Date first made open access:No date available

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