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Published 19 December 2005. doi:10.1083/jcb.200510038
The Rockefeller University Press, 0021-9525 $8.00
JCB, Volume 171, Number 6, 1045-1059
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Article

Desmoplakin assembly dynamics in four dimensions

: multiple phases differentially regulated by intermediate filaments and actin



Lisa M. Godsel1, Sherry N. Hsieh1, Evangeline V. Amargo1, Amanda E. Bass1, Lauren T. Pascoe-McGillicuddy1,4, Arthur C. Huen1, Meghan E. Thorne1, Claire A. Gaudry1, Jung K. Park1, Kyunghee Myung3, Robert D. Goldman3,4, Teng-Leong Chew3, and Kathleen J. Green1,2

1 Department of Pathology, Northwestern University Feinberg School of Medicine, Chicago, IL 60611
2 Department of Dermatology, Northwestern University Feinberg School of Medicine, Chicago, IL 60611
3 Department of Cell and Molecular Biology, Northwestern University Feinberg School of Medicine, Chicago, IL 60611
4 The R.H. Lurie Cancer Center, Northwestern University Feinberg School of Medicine, Chicago, IL 60611

Correspondence to Kathleen J. Green: kgreen{at}northwestern.edu

The intermediate filament (IF)–binding protein desmoplakin (DP) is essential for desmosome function and tissue integrity, but its role in junction assembly is poorly understood. Using time-lapse imaging, we show that cell–cell contact triggers three temporally overlapping phases of DP-GFP dynamics: (1) the de novo appearance of punctate fluorescence at new contact zones after as little as 3 min; (2) the coalescence of DP and the armadillo protein plakophilin 2 into discrete cytoplasmic particles after as little as 15 min; and (3) the cytochalasin-sensitive translocation of cytoplasmic particles to maturing borders, with kinetics ranging from 0.002 to 0.04 µm/s. DP mutants that abrogate or enhance association with IFs exhibit delayed incorporation into junctions, altering particle trajectory or increasing particle pause times, respectively. Our data are consistent with the idea that DP assembles into nascent junctions from both diffusible and particulate pools in a temporally overlapping series of events triggered by cell–cell contact and regulated by actin and DP–IF interactions.

Sherry N. Hsieh and Evangeline V. Amargo contributed equally to this paper.

Abbreviations used in this paper: ASMDW, application solution multidimensional workstation; DOX, doxycycline; DP, desmoplakin; DPgly, desmoplakin containing a glycine substitution at Ser2849; DPNTP, desmoplakin NH2-terminal peptide; Dsc, desmocollin; Dsg, desmoglein; IF, intermediate filament; Pg, plakoglobin; PKP, plakophilin.


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