Membrane Proteins: Structure and Arrangement in the Membrane
The membranes of a cell have the principal function of setting the boundaries between the cell and the environment and between compartments within the cell. These boundaries prevent the movement of all polar solutes from one compartment to another, unless such movement is required for biological activity; under these circumstances, special transport systems are required. Thus membranes can be considered as structures which are selectively permeable. The barrier to movement of polar solutes across the membrane is provided by one of the two major components of the membrane: the lipids. The other major component of the membrane, the proteins, provides the permeability function. Membrane proteins also determine most of the other properties of a membrane: They carry the determinants of specificity which distinguish one cell from another and allow for recognition between cells; they determine the shape and architecture of the membrane; they are the receptors for information about the environment and relay that information to other parts of the cell; and they are enzymes with a precise compartmental localization.
KeywordsHuman Erythrocyte Intrinsic Protein Peptide Group Polar Solute Extrinsic Protein
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