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Unformatted text preview: -Large protein molecules often contain more than one polypeptide chain-Proteins can assemble into filaments, sheets or spheres-Extra cellular proteins are often stabilized by covalent bonds-Most common is the disulfide bond-Anything that binds to a protein is called a ligand-Antibodies, proteins that recognize antigens-Enzymes are proteins-3 ways an enzyme encourage catalysis: binding to two substrate molecules, binding to a substrate and rearranging the electrons, or straining the bound substrate-Feedback inhabitation is negative regulation, preventing an enzyme from acting-Positive regulation stimulates enzyme activity -Many proteins are allosteric , and can adopt 2 or more slightly different conformations-Another method used to regulate protein activity involves attaching a phosphate group to one of the amino acid side chains: phosphorylation-Addition of phosphate catalyzed by protein kinase-Removal of phosphate catalyzed by protein phosphatase...
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- Fall '10
- Amino Acids, amino acid sequence, -Although protein chains