Proteins examples
- Created by: Jasmin
- Created on: 19-10-13 18:28
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- Globular Protein Haemoglobin
- Fibrous Protein Collagen
- Rope shaped, tough
- Form long chains which run parallel to one another
- Chains linked by cross bridges
- So form very stable molecules
- Chains linked by cross bridges
- Made up of 3 polypeptide chains, tightly coiled in a strong triple helix
- Chains are interlocked by covalent bonds
- Point where one collagen molecule ends and the next begins are spread throughout the fibre rather than all being in the same position along it
- If all occurred at the same point - major weak point where fibre might break
- Collagen found in tendons - join muscles to bones
- Minerals can bind to triple helix to increase its strength
- Tend to be found in connective tissues e.g. tendons
- Round
- Carries out metabolic functions
- Structure is curled up so hydrophilic side chains face outwards and hydrophilic inwards
- Makes haemoglobin soluble therefore good for transport in blood
- a.k.a conjugated protein - has non protein group in it called prosthetic group
- Each polypeptide chain in haemoglobin molecule contains a haem group
- Each haem group can associate with one molecule of oxygen
- So 1 haemoglobin molecule can bind 4 molecules of oxygen
- Each haem group can associate with one molecule of oxygen
- Compact and easily soluble so they can be transported in fluid
- Fibrous Protein Collagen
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