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Science 21 June 1974:
Vol. 184. no. 4143, pp. 1294 - 1296
DOI: 10.1126/science.184.4143.1294
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Articles

Mobility and the Restriction of Mobility of Plasma Membrane Lectin-Binding Components

Garth L. Nicolson 1 and Ryuzo Yanagimachi 2

1 Cancer Council and Electron Microscopy Laboratories, Salk Institute for Biological Studies, San Diego, California 92112
2 Department of Anatomy and Reproductive Biology, University of Hawaii School of Medicine, Honolulu 96822

Labeling by ferritin-conjugated agglutinins from Ricinus communis was used to demonstrate the relative mobilities of the agglutinin receptors located in specific regions on plasma membranes of rabbit spermatozoa. The relative mobility of lectin receptors was higher on postacrosomal regions of sperm than on acrosomal and tail regions. Lectin-induced clustering could not be demonstrated in the acrosomal and tail regions, an indication of the existence of localized restraints on the mobilities of lectin receptors. A system of transmembrane restraints may maintain the segregation of plasma membrane components into membrane domains on certain highly differentiated cells.


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Science. ISSN 0036-8075 (print), 1095-9203 (online)