Membranes160-page3

Membranes160-page3 - Communication Proteins Communication...

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Membrane Structure and Function - 3 Membrane Proteins The membrane proteins have a number of functions. Some are embedded in the phospholipid layers; others move (literally) throughout the membrane layers. Other membrane proteins are complexed to carbohydrate molecules, forming glycoproteins. Generally, there are a number of different membrane proteins. Cell Adhesion (Intercellular Joining) Proteins. Some proteins are responsible for the cell junctions such as tight junctions that permit cells to adhere to each other. Some adhesion proteins attach to the cytoskeleton or extracellular matrix to help maintain cell shape (particularly for animal cells) and fix into position some membrane proteins. Collagen is an important glycoprotein of the extracellular matrix.
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Unformatted text preview: Communication Proteins Communication proteins are responsible for the cell gap junctions that permit cells to communicate with each other. Gap junctions are common in heart muscle cells so that the contraction can be coordinated. Receptor Proteins Receptor proteins serve as binding or attachment sites, especially for hormones or other molecular messengers. Once activated, they trigger certain cell responses, often using signal transduction pathways. Some receptors work in conjunction with carrier proteins, opening gated channels for ion movement. Other receptors are sensitive to nutrient levels, affect metabolic rate or even affect cell division....
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