BIOL 1000 Lecture Notes - Lecture 6: Ovalbumin, Egg White, Peptide
13 May 2017
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Document Summary
= chemical catalysts that speed up chemical reactions in cells. Structural proteins = found in hair and fibres that make up tendons and ligaments . Contractile proteins = found packed inside muscle cells . Receptor proteins = built into cell membranes, transmit signals into cells . Transport proteins e. g. hemoglobin delivers o2 to working muscles & tissues . Signal proteins e. g. hormones and other chemical messengers . Storage proteins e. g. ovalbumin (found in egg white) source of amino acids for developing embryos . Lysosome enzyme found in sweat/tears/saliva, one long polypeptide folded into a globular shape . Most enzymes and other proteins are globular in shape. Structural proteins are typically long and thin, called fibrous proteins . Proteins must bind to other molecules to function . Denaturation = polypeptide chains unravel, losing their specific shape and function . Can be due to changes in salt concentration and ph, excessive heat. A protein"s shape depends on four levels of structure.
