NUTR 207 Study Guide - Final Guide: Alpha Helix, Beta Sheet, Isoleucine
20 Oct 2017
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6. 1 chemistry: made of c h o n. Aa have same structure: central c with carboxyl end and amino end, and side chain (distinguishing feature). Wide variation in side groups, proteins much more complex than carbs or fats; made up of many different aa. Proteins in body made up of about 20 diff aa, 9 are essential (can t make): isoleucine, lysine, leucine, valine, tryptophan, threonine, methionine, phenylalanine, histidine. Body can synthesize fast enough to meet needs. Rest are conditionally essential; if not synthesized fast enough, may need in diet. Other amino acids may be in body but are not part of proteins. Proteins: aa linked together in condensation rxn, peptide bond, many make polypeptide. Secondary structure: electrical attractions, h bonding to fold into alpha helix or beta sheet. Tertiary structure: long chains twist and fold into complex shape; hydrophobic parts hide, hydrophilic faces outside. Quaternary structure: some need to form larger complexes with other folded polypeptides.
