Parallels in Cell to Cell Junctions in Plants and Animals by R. Dermietzel, T. K. Hwang (auth.), A. W. Robards, W. J.

By R. Dermietzel, T. K. Hwang (auth.), A. W. Robards, W. J. Lucas, J. D. Pitts, H. J. Jongsma, D. C. Spray (eds.)

Intracellular junctions offer routes for direct cell-to-cell signalling in either vegetation and animals. the current quantity treats the parallels and alterations among such junctions in animals and crops and discusses the latest tools of reading the physiological services and rules of intracellular verbal exchange. powerful facts of either molecular in addition to sensible simi§ larities among plasmodesmata and hole junctions is expanding. much more fascinating is the invention that animal hole junction proteins cross-react immunologically with a few proteins in plant cells. hence the molecular building and serve as of those crucially very important ultrastructural cellphone parts is now open to a concerted learn attempt to appreciate how cells, either plant and animal, facilitate and keep watch over intercellular transport.

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1987) have revealed that plakoglobin is a component of the filamentous sub-plasmalemma coat of lens cells. This protein characterizes the intramembrane adhering junction in close connection with other cytoskeletal proteins. Another amphitropic protein, vinculin, has also been revealed by fluorescence and immunogold labeling techniques both on intact lens cryostat sections and in lens fiber ghosts (Fig. 4A and B). , 1988), we demonstrate, by immunogold labeling experiments, that vinculin appears not to be directly associated to the inner cytoplasmic surface of the junctional domain.

It is likely that individual intramembranous particles visualized on the fracture faces of reconstituted proteoliposomes contain more than one copy of MP26. If we consider MP26 as the only protein component of the reconstituted liposomes then each individual 8 nm intramembranous particle would contain no more than four copies of the polypeptide. One may expect that MP22 displaying the same transmembrane segments will also form tetrameric oligomers (Fig. 3C). , 1987). There has been controversy about whether highly charged amphipatic helices or uncharged ones provide the lining.

It is possible that expression of different connexins is regulated according to the needs of different functions of gap junction channels. This leads to the prediction that the level of connexin transcripts may be differently controlled. Alternatively translational control or posttranslational modifications of connexins could also lead to functional regulation of gap junction channels. We have investigated the level of connexin transcripts in several cell types. Six newly established, independent cell lines from hepatocytes of 18 days old mouse embryos in serum free medium express similar levels of cx32 and cx26 transcripts as found in embryonic liver.

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