Subdecks (1)

    Cards (15)

    • Amino acid structure
    • Amino acid
      • 20 different amino acids that make proteins
      • R group differs for each amino acid
      • 2 bonded amino acids= dipeptide
      • more than 2= polypeptide
    • Dipeptide
      Two amino acids bonded together
    • primary structure
      The specific sequence of amino acids that make up a protein
    • Secondary structure
      Coiling and pleating of parts of the polypeptide molecule
      Alpha helix and beta pleated sheets
    • Alpha helix
      • right hand coil
      • as it coils, hydrogen bonds form
      • stabilises the protein
    • Beta pleated sheets
      • Amino acid chain folds up on itself
      • hydrogen bonds form across sheets
      • stabilises the protein
    • How is the tertiary structure of a protein held together?

      polar interactions, disulphide bonds, Ionic interactions and covalent bonds
    • quatenary structure
      more than one polypeptide chain
    • Disulphide bonds/ bridges/ linkages
      • covalent bonds
      • will bond as soon as two R groups with sulphur are close
    • Ionic interactions
      • Carboxyl and amino groups form charges in solutions
      • Opposite charges come together
    • 3D proteins shapes
      • Fibrous
      • Globular
    • Fibrous
      • Structural functions
      • repetitive amino acid sequences
      • usually insoluble
    • Globular
      • metabolic functions
      • formed through hydrophobic and hydrophilic interactions
      • water soluble