© The Rockefeller University Press,
0021-9525/1997//1835 $5.00
The Journal of Cell Biology, Volume 139, Number 7,
, 1997 1835-1849
Periplakin, a Novel Component of Cornified Envelopes and Desmosomes That Belongs to the Plakin Family and Forms Complexes with Envoplakin
Christiana Ruhrberg*,
M.A. Nasser Hajibagheri
,
David A.D. Parry
, and
Fiona M. Watt*
* Keratinocyte Laboratory,
Electron Microscopy Unit, Imperial Cancer Research Fund, London WC2A 3PX, UK; and
Department of Physics, Massey University, Palmerston North, New Zealand
The cornified envelope is a layer of transglutaminase cross-linked protein that is assembled under the plasma membrane of keratinocytes in the outermost layers of the epidermis. We have determined the cDNA sequence of one of the proteins that becomes incorporated into the cornified envelope of cultured epidermal keratinocytes, a protein with an apparent molecular mass of 195 kD that is encoded by a mRNA with an estimated size of 6.3 kb. The protein is expressed in keratinizing and nonkeratinizing stratified squamous epithelia and in a number of other epithelia. Expression of the protein is upregulated during the terminal differentiation of epidermal keratinocytes in vivo and in culture. Immunogold electron microscopy was used to demonstrate an association of the 195-kD protein with the desmosomal plaque and with keratin filaments in the differentiated layers of the epidermis. Sequence analysis showed that the 195-kD protein is a member of the plakin family of proteins, to which envoplakin, desmoplakin, bullous pemphigoid antigen 1, and plectin belong. Envoplakin and the 195-kD protein coimmunoprecipitate. Analysis of their rod domain sequences suggests that the formation of both homodimers and heterodimers would be energetically favorable. Confocal immunofluorescent microscopy of cultured epidermal keratinocytes revealed that envoplakin and the 195-kD protein form a network radiating from desmosomes, and we speculate that the two proteins may provide a scaffolding onto which the cornified envelope is assembled. We propose to name the 195-kD protein periplakin.
Abbreviations used in this paper: BPAG1, bullous pemphigoid antigen 1; CSK, cytoskeleton extraction.
Address all correspondence to F.M. Watt, Keratinocyte Laboratory, Imperial Cancer Research Fund, 44 Lincoln's Inn Fields, London WC2A 3PX. Tel.: 44-171-269-3528. Fax: 44-171-269-3078.

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