BIO206H5 Chapter Notes - Chapter 2: Protein Folding, Antifreeze Protein, Covalent Bond
Document Summary
5/30/2010 4:30:00 pm: proteins are the building blocks from which cells are assembled; they constitute most of the cell"s dry mass, proteins also execute nearly all its myriad functions. Panel 4-1 (a few examples of some general protein functions) Enzymes": catalyze covalent bond breakage or formation, e. g. Pepsin" degrades dietary proteins in the stomach, dna polymerase- copies dna. Structural protein": provides mechanical support to cells and tissues, e. g. outside cells, collagen" & elastic" are common constituents of extracellular matrix and form fibers in tendons and ligaments. Transport protein": carries small molecules or ions, e. g. Motor protein": generates movement in cells and tissues, e. g. Kinesin" interacts with microtubules to move organelles around the cell. Storage protein": stores small molecules or ions, e. g. Iron is store in the liver by binding to the small protein ferritin". Signal protein": carries signals from cell to cell, e. g. Receptor protein": detects signals and transmits them to the cell"s response machinery, e. g.
