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?
- 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
- Soluble in water
- Hydrophilic side chain (R group) points outwards to maintain solubility
- Hydrophobic side chain (R group) points inwards to escape water
- 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
- The iron molecule combines with oxygen at high oxygen concentrations and releases it at low oxygen concentrations
- In this case haemoglobin contains four globular polypeptide.each of which containing a porphyrin ring which contains an iron ion Fe^2+
- Meaning it contains amino acids and some other type of chemical molecule
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