Protein Structure: Globular Haemoglobin

Explains:

  • What is haemoglobin made from?
  • Why is it soluble?
  • How much oxygen it can carry
  • Globular structure
  • What is the prosthetic group?
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  • Created by: lucy~
  • Created on: 04-10-13 18:50
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  • Haemoglobin
    • A reddish purple, oxygen-carrying pigment found in red blood cells
    • Made from 4 polypeptide chains
      • Two identical Alpha chains and two identical Beta chains
      • Each polypeptide chain contains a Haem group
        • A Haem group is a prosthetic group (an important part of a protein molecule which is not made from amino acids
    • Globular Protein
      • Hydrophobic side chain (R group) points inwards to escape water
        • Soluble in water
          • Hydrophilic side chain (R group) points outwards to maintain solubility
      • Hydrophilic side chain (R group) points outwards to maintain solubility
    • Haemoglobin is a conjugated protein
      • Meaning it contains amino acids and some other type of chemical molecule
        • In this case haemoglobin contains four globular polypeptide.each of which containing a porphyrin ring which contains an iron ion Fe^2+
          • The iron molecule combines with oxygen at high oxygen concentrations and releases it at low oxygen concentrations
            • Because haemoglobin contains 4 iron ions, it can bind with 4 oxygen molecules
          • Because haemoglobin contains 4 iron ions, it can bind with 4 oxygen molecules

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