Proteins

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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
    • 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
    • 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
    • Conjugated proteins
      • Glycoprotein
      • Lipoprotein
      • Nucleoprotein
      • Haemoglobin

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