BIOL 200 Chapter 3: Chapter 3 - Protein Structure and Function
23 Nov 2013
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Structural: determine shapes of cells, are guide rails. Sca old: bring other proteins together to perform functions. Membrane transport proteins: permit ow of ions and molecules across membranes. Fold into 3d shape, held together by noncovalent interactions. Function comes from 3d structure, 3d structure comes from aa sequence and intramolecular noncovalent interactions. Primary structure is the sequence of aa"s. Aa"s are linked by peptide bond - between amino group of aa #1 and carboxyl group of aa #2. Oligopeptide/peptide: a short, de ned chain of amino acids (20-30 aa long) Dalton: 1 dalton = 1 atomic mass unit. = spatial arrangements of segments of polypeptide chains held together by h bonds. H bonds are between backbone amide and carbonyl groups. Carbonyl"s o hydrogen bonds to amide h atom of aa 4 units down the chain (toward. All h-bond receptors point in the c" end (down)
