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Membrane Proteins

Membrane Proteins - transport proteins and receptors...

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Membrane Proteins Although proteins only constitute about 2% of the molecules found in plasma membrane, they are essential for the two major functions of the cellular membrane: sensitivity and selective permeability . There are two major types of proteins associated with the cellular membrane, transmembrane proteins that pass completely through the membrane, and peripheral proteins, that are loosely associated with the lipids or proteins of the cellular membrane. Peripheral proteins often serve as anchors and intracellular signaling molecules. Most transmembrane proteins are glycoproteins with the sugar part extending into the external environment and forming part of the glycocalyx. These proteins form two major classes of membrane proteins:
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Unformatted text preview: transport proteins and receptors . Membrane Protein Functions The proteins in the membrane enable the membrane to perform its functions. Receptors in the membrane receive information from the environment and convert it into signaling molecules inside the cell. Receptors also identify the cell as "self " and enable the cells to adhere to each other or surrounding structures. Other proteins act as "doors" and "windows" in the lipid bilayer to allow solutes to enter or leave the cell. These proteins are called pores , channels , carriers , and pumps ....
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