MBG 2040 Lecture 25: Lectures 25-27 PDF
4 Dec 2016
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Amino acids o o o o o o. Proteins are 15% of wet weight of cells (most abundant after water) Amino acids are the building blocks of proteins as nucleotides are for nucleic acids. A polypeptide is a long chain of amino acid residues comprising 20 different kinds of amino acids. Amino acids have three parts: a free amino group, a free carboxyl group, and a side group designated as r. Properties of amino acids are determined by their side chains. Amino acid residues are joined by peptide bonds. The carboxyl group of one amino acid is covalently linked to the amino group of the next amino acid. By convention, a polypeptide chain goes from the n (amino) to the c (carboxyl) terminus. Polypeptide = long chain a. a. (i. e. insulin - 51 a. a. ; silk protein fibroin - 100 a. a. ) # of diff a. a. sequences that can occur in a polypeptide = 2a. a. o.
