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Journal of Cell Science, Vol 111, Issue 15 2109-2120, Copyright © 1998 by Company of Biologists
JOURNAL ARTICLES |
I Dunia, M Recouvreur, P Nicolas, N Kumar, H Bloemendal and EL Benedetti
Institut J. Monod CNRS, Universite Paris VII, France. dunia@ijm.jussieu.fr
The SDS-fracture immunolabeling technique, unlike conventional freeze-fracture, provides direct evidence for the biochemical nature of membrane constituents. SDS-fracture immunolabeling shows that during differentiation of lens fiber cells the onset of junctional assembly is characterized by the presence of small clusters and linear arrays comprising connexins alpha3 and alpha8. At this initial stage MP26, a major fiber membrane constituent, appears to be colocalized with these two connexins. The application of double-immunogold labeling reveals that when large junctional plaques are assembled MP26 becomes mainly associated with the periphery of the junctional domains. This type of distribution suggests that MP26 may play a role in the clustering and gathering of connexons. In aged nuclear fiber membranes connexins, MP26 and their proteolytic derivatives form an orthogonal lattice of repeating subunits.
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