Membranes160-page4 - water channels that facilitate the...

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Membrane Structure and Function - 4 Transport Proteins Transport Proteins function as carriers, which have binding sites that attract specific molecules. When a molecule binds to the carrier protein, the protein changes shape and moves the substance through the membrane. This process often requires energy (ATP), and the ATP complex is a part of the transport protein. When ATP is involved with actively moving molecules through the protein channel the process is called Active Transport. Most of our ions (Ca ++ , Na + , Cl - , K + , etc.), along with amino acids, sugars and other small nutrient molecules are moved through transport proteins. Other transport proteins form channels within the phospholipid bilayer, which allows small water-soluble molecules to pass through. Aquaporins are important
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Unformatted text preview: water channels that facilitate the movement of water through membranes. Some channels are gated. Recognition Proteins Glycoproteins (carbohydrate-protein hybrids) and some glycolipids serve as surface receptors for cell recognition and identification. They are important to the immune system so that immune system cells can distinguish between ones own cells and foreign cells. Recognition proteins are also used to guide cell attachments/adhesions in developmental processes. Enzymatic Proteins Many enzymes are embedded in membranes, which attract reacting molecules to the membrane surface. Enzymes needed for metabolic pathways can be aligned adjacent to each other to act like an assembly line for the reactions....
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This note was uploaded on 12/29/2011 for the course BIO 151 taught by Professor Edwards during the Spring '10 term at SUNY Stony Brook.

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