Concanavalin A binding sites on the plasma membrane of leek stem protoplasts |
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Authors: | Francis A. Williamson |
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Affiliation: | (1) Laboratoire de Biologie Végétale, Cytologie Expérimentale, Ecole Normale Supérieure, 24 rue Lhomond, F-75231 Paris, France;(2) Institute of Biochemistry and Biophysics, University of Tehran, P.O. Box 314-1700, Tehran, Iran;(3) Present address: 540 Reynolds St., 17701 S. Williamsport, PA, USA |
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Abstract: | The binding of concanavalin A (con A) to leek (Allium porrum L.) stem protoplasts has been investigated using sequential treatment with con A and haemocyanin and using con A covalently linked to ferritin. Prefixed protoplasts were evenly labelled. Unfixed protoplasts showed a clustered distribution of label. Low temperature and lanthanum reduced the clustering. Bound con A was lost from unfixed protoplasts incubated for 5 h after treatment, but con A/haemocyanin was not bound to nascent wall materials. Prefixed protoplasts treated with wall-removing enzymes before labelling showed only a small reduction of con A binding. These results indicate that con A is bound to plasma membrane components, but that binding is reduced by competition of nascent wall precursors.Abbreviations con A concanavalin A - con A-H sequential treatment with con A and haemocyanin - con A-F con A covalently linked to ferritin |
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Keywords: | Allium Concanavalin A Fluidity Lanthanum Plasma Membrane Protoplasts |
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