Structure and formation of Proteins

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  • Created by: Tre
  • Created on: 24-10-12 18:18
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  • Haemoglobin: structure and formation of proteins.
    • Haemoglobin is a protein.
      • Haemoglobin is a polymer.
        • Monomers are amino acids.
    • Amino acids = a carboxylic acid group and an amino group.
      • 20 different amino acids. Each has a different R group.
    • There are 4 structures to proteins
      • Primary Structure - the number and sequence of amino acids in polypeptide chain.
        • Secondary - chain becomes so long it coils into a ALPHA-HELIX or folded into a BETA-PLEATED SHEET. Weak hydrogen bonds to hold the shape. R groups not involved.
          • Tertiary - polypeptide chain is folded/coiled again into a specific shape held by bonds between the R groups of amino acids in chain.
            • Quaternary - contains more than one polypeptide chain.
    • Hydrogen, Ionic and Disulfide bridge are 3 main bonds
      • Hydrogen and Ionic bonds are weak.
      • Disulfide bond is strong - only amino acid, CYSTEINE, would form this bond.
  • Haemoglobin is a polymer.
    • Monomers are amino acids.
  • 4 bond that stablise this structure: Hydrogen, Hydrophobic/hydrophilic interactions, ionic and disulfide

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