Proteins can be divided into two types;
Fibrous
- Have a secondary structure
- Long parallel polypeptide chains of amino acids joined by peptide bonds twisted into an alpha helix or beta pleated sheet and held in position by hydrogen bonds
- Several long polypeptide chains twist together to form long, rope like fibres
- Fibrous proteins are insoluble, so cannot dissolve
They have a structural function. Examples include;
- Collagen - The main component of connective tissue found in ligaments, tendons and cartilage
- Keratin - The main component of hard structures such as hair, nails, hooves and claws. Also a resistant protein in skin cells which helps prevent entry of pathogens
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