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BIOLOGY 1A03 (168)
Chapter 3

Chapter 3 Proteins

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McMaster University
Lovaye Kajiura

Chapter 3 Protein structure and functionthere are 20 types of amino acids all have common structure and amino group NH and carboxyl 3OCO H and an R group functional group The central c has 4 bonds the side chain dictates how reactive the amino acid is and whether it is soluble or not the amino acid has to be reactive to form larger compounds amino acids with sulphur in their side chain often react to produce larger compounds Carbon and hydrogen side chains rarely react therefore dont polymerizemonomeramino acid polymerprotein Formed from peptide bond 2H from NH and O from 3carboxyl acid ionized therefore no H so O hydrothermal vents in the bottom of the ocean have created amino acid polymerizationR group orientation in each amino acid polymer chain the r group extends out perpendicular to the chain restricting them from interacting with one another Flexibility the peptide bonds simulate a double bond structure however the ends of the chain contains single bond structures and can be rotate Function within cellCatalysis enzyme reduces activation energy required for a rxnDefence antibodies are proteins help destroy diseases and bacteriaSignaling proteins are involved in carrying and receiving signals from cell to cell in the body Glucagon
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