protein structure

    Cards (8)

    • tertiary structure :
      3D structure formed by further folding of polypeptide
      • disulfide bridges
      • ionic bonds
      • hydrogen bonds
    • Primary structure of a protein is the order and number of amino acids in a protein. Initial sequence of amino acids and will determine proteins functions.
    • Secondary structures is the shape that the chain of amino acid makes , either alpha helix or beta pleated sheets bonded by weak hydrogen bonds
    • Tertiary structure of proteins is the 3D shape of the protein and is formed from further twisting and folding .
      Contains :
      Disulfide bridges
      Ionic bonds
      hydrogen bonds
    • Disulfide bridges - strong bonds between sulfur and R group
    • Ionic bonds form between the carboxyl group and amino groups that are not in the peptide bond, weaker than disulfide bridges and easily broken by pH
    • Hydrogen bonds - numerous and easily broken
    • The Quaternary structure of a protein is the precise 3D structure held together by the same types of bond as tertiary structure. May involve addition of prosthetic groups e.g metal ions or phosphate groups