PMID: 7011395Mar 6, 1981Paper

Biochemical studies of the excitable membrane of Paramecium tetraurelia. V. Effects of proteases on the ciliary membrane

Biochimica Et Biophysica Acta
R RamanathanR R Dute

Abstract

The swimming behavior of Paramecium is regulated by an excitable membrane that covers the body and cilia of the protozoan. In order to obtain information on the topology and function of ciliary membrane proteins, Paramecia were treated with trypsin, chymotrypsin or pronase and the effects of these proteases were analyzed using electron microscopy, gel electrophoresis of ciliary fractions and behavioral tests. At the concentrations used, trypsin and chymotrypsin had little or no effect on the cells while pronase removed the cell surface coat, visible as fuzzy material covering the cell membrane. The same pronase treatment caused the specific removal of a high molecular weight protein (250 000), as judged by sodium dodecyl sulfate polyacrylamide gel electrophoresis. This protein, the 'immobilization antigen', constitutes the major protein of the ciliary membrane. Although the immobilization antigen was removed (or markedly decreased), no marked and reproducible difference was observed in the swimming behavior of the treated cells. We also determined the effects of proteases on isolated ciliary fractions to explore the sidedness of ciliary membrane proteins. A set of proteins relatively resistant to protease digestion was identifi...Continue Reading

References

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Citations

Apr 1, 1982·The Journal of Cell Biology·R A Bloodgood, G S May
Nov 1, 1983·The Journal of Cell Biology·R RamanathanC Kung
Jul 15, 2005·The Journal of Eukaryotic Microbiology·Martin C Simon, Helmut J Schmidt
Feb 16, 2007·The Journal of Eukaryotic Microbiology·Martin C Simon, Helmut J Schmidt
Oct 15, 1983·Experimental Cell Research·A AdoutteC Kung

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