Biology 1002B Lecture Notes - Lecture 3: Alpha Helix, Protein Folding, Beta Sheet
26 Jan 2016
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Document Summary
Speed up movement of substances across biological membranes. Bind molecules at cell surface/within cell; some trigger internal cellular responses. Generalized structure of amino acid has a central carbon atom attached to an amino group, a carboxyl group, and a hydrogen atom: remaining bond of central carbon is to 1/20 different side groups represented by r. Proteins are synthesized from 20 different amino acids. Need to know that some amino acids are more polar than others, but do not need to know specific structures. Polypeptide vs. protein: a polypeptide is simply a string of amino acids; a protein is a polypeptide that has folded into a specific 3d shape that is required for most proteins to be functional terminus. Amino end of a polypeptide is the n-terminus, and the carboxyl end is the c- Primary structure: particular/unique sequence of amino acids forming a polypeptide. Secondary structure: the twists and turns of the amino acid chain.
