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Science 3 April 1981:
Vol. 212. no. 4490, pp. 14 - 20
DOI: 10.1126/science.6259730
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Articles

Science, Vol 212, Issue 4490, 14-20
Copyright © 1981 by American Association for the Advancement of Science

articles

Polypeptide-binding membrane receptors: analysis and classification

J Kaplan

Polypeptide receptors on mammalian plasma membranes can be categorized on the basis of function. The binding of ligand by class I receptors results in changes in cell metabolism or behavior. Hormone-receptor interactions typify this group. The binding of ligand by class II receptors in ligand internalization. Although changes in cellular activity may result from metabolism of the internalized ligand, the interaction between ligand and class II receptor does not itself lead to alterations in cell behavior. Class II receptors include those for low-density lipoproteins and for alpha-macroglobulin-protease complexes. Although receptors within each category are chemically disparate, they show striking similarities in behavior. Analysis of the behavioral patterns of receptors in each category reveals insights into receptor physiology and allows for a prospective analysis of receptor characteristics.


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