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Identification of concanavalin A receptors and galactose-binding proteins in purified plasma membranes of Dictyostelium discoideum

West, Christopher M. and McMahon, Daniel (1977) Identification of concanavalin A receptors and galactose-binding proteins in purified plasma membranes of Dictyostelium discoideum. Journal of Cell Biology, 74 (1). pp. 264-273. ISSN 0021-9525. PMCID PMC2109878. doi:10.1083/jcb.74.1.264.

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Two techniques have been modified to provide simple means for the identification of molecules which bind concanavalin A (Con A). Crossed immunoelectrophoresis was altered by replacing antibody with Con A, and receptors were identified by the precipitin arcs which they produced. Con A, tagged with fluorescein isothiocyanate, was also diffused into prefixed sodium dodecyl sulfate (SDS)-polyacrylamide gels, and additional receptors identified by fluorescence. More than 35 molecules in the plasma membranes of the cellular slime mold Dictyostelium discoideum which bind Con A were identified with these techniques. At least 12 of these diminish and 12 increase in importance as receptors during differentiation of the cells from the vegetative to the preculmination stage of development. In the course of these experiments, it was possible to confirm the presence of the galactose-binding protein discoidin, in the plasma membrane, by electrophoresing membrane proteins into an agarose gel. This lectin regains its sugar- binding activity after denaturation and electrophoresis in SDS.

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Additional Information:© 1977 by The Rockefeller University Press Received for publication 6 July 1976, and in revised form 4 January 1977 Dr. W. J. Dreyer, Dr. J. P. Revel, and Mr. Bob Watson kindly permitted us to use some of their facilities. We appreciate a generous gift of discoidin from Mr. D. Lesikar and Dr. S. Barondes. This work was supported by National Institutes of Health grant GM06965. This paper is the third in a series entitled, The Role of The Plasma Membrane in The Development of Dictyostelium discoideum. Paper number two is reference 11.
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PubMed Central ID:PMC2109878
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Deposited On:27 Nov 2006
Last Modified:08 Nov 2021 20:31

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