Proteins
- Created by: pcanavan123
- Created on: 06-06-14 14:47
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- Proteins
- Primary
- sequence of amino acids in the chain
- amino group at one end, carboxyl group at the other
- Secondary
- a-helix
- twisting the chain into a coil held together by H-bonds
- hydrogen bonds
- between peptide links in adjacent parts of the chain
- B-pleated sheet
- regions of the chain lining up - H-bonds
- a-helix
- Tertiary
- polypeptide folds over on itself = 3D shape
- interaction between free R-groups of amino acids
- different interactions
- disulfide bonds (ulfur containing R-groups)
- ionic bonds (ionised R-groups)
- hydrophobic interactions (non-polar R-groups)
- hydrogen bonds (polar R-groups)
- Globular proteins
- Haemoglobin in RBC. consists of: 2 a-chains and 2 B-chains
- polypeptide folds over on itself = 3D shape
- Quaternary
- 2 or more polypeptide chains bonded together
- Fibrous protein
- Collagen - strong fibres in the skin, tendons and ligaments
- 3 identical polypeptides coiled around each other by H-bonds
- Collagen - strong fibres in the skin, tendons and ligaments
- Conjugated proteins
- Glycoprotein
- Lipoprotein
- Nucleoprotein
- Haemoglobin
- Primary
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