BIOL 112 Chapter Notes - Chapter 4.1, 6.5: Amine, Protein Structure, Hydrophile
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BIOL 112 Full Course Notes
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Cooh group becomes -coo- (losing a proton) polar) R-groups of basic and acidic amino acids are also important as they will go on the outside of the protein structure and can interact with water and ions. Proteins serve a very wide variety of functions in the cell which depend on the: primary structure: sequence of amino acids. Proteins have four structures: read from the amino end to the carboxyl end. 3d structure of the protein: structural components, communicators, enzymes (catalysts for reactions) between amino and carbonyl groups in the chains. Secondary structures ((cid:573)-helix or (cid:574)-sheets) are formed because of hydrogen bonds: (cid:573)-helices: coiled, with 3. 6 amino acids per turn, (cid:574)-sheets: amino acids fold back and forth on itself and hydrogen bonds form. Usually 4-10 polypeptide chains are arranged side by side. R-groups project outwards from the helix between carbonyl and amino groups on adjacent chains.
