Classification of Proteins

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  • Classification of Proteins
    • Fibrous Proteins
      • They perform a structural role
      • They form long chains which run parallel to one another
      • The chains are linked by cross-bridges to form stable molecules that form fibres
      • For example, collagen found in tendons, the walls of blood vessels, bone and ligaments is made up of three polypeptide chains wound around each other like a rope.
      • For example, keratin found in hair. It's the strongest thing known to man for the thickness.
      • Fibrous proteins are insoluble in water, strong and tough. They provide tensile strength.
      • Primary structure is a repeated sequence of amino acids.
    • Globular Proteins
      • Over 90% of all proteins are in this specific class.
      • They have irregular amino acid sequences of amino acids
      • They form compact, spherical structures like a ball of string
      • They have relatively unstable structures
      • They are soluble.
        • For example, enzymes, antibodies, plasma proteins and hormones.
      • Haemoglobin is made up of 4 folded polypeptides chains at the centre of which is an iron-containing group called haem.


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