Abstract
The membrane skeleton, a network of structural proteins attached to the cytoplasmic surface of the plasma membrane, hinders lateral diffusion of integral proteins. 1. 2. In some types of cells, such as epithelial cells and nerve cells, the obstruction of lateral diffusion by the membrane skeleton is one of the mechanisms by which proteins are localized to domains on the cell surface. 2. 3. The effect of the membrane skeleton on lateral diffusion may involve steric hindrance, transient binding or both. Three plctures of the effect are reviewed, the discrete barrier model, the continuous barrier model and the transient binding model. 3. 4. Experiments to distinguish the models are discussed.
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