biomolecules part 2

• the molecular weight of biomacromolecules are greater than 1000 DA
• biomacromolecules include: proteins, polysaccharides, and nucleic acids
• water: 70 - 90%
• protein: 10 - 15%
• carbohydrates: 3%
• nucleic acids: 1%
• proteins are heteropolymer of amino acids
• what is the most abundat protein in the animal world?

  collagen
• most abundant protein in the biosphere?

  RuBisCo
• meaning of RuBisCo?


  Ribulose bisphosphate carboxylase - oxygenase
• functions of protein:

  • for growth and tissue repair.
  • Transports nutrients across cell membranes
  • Acts as intercellular ground substance
  • Acts as antibodies to fight viruses.
  • Acts as receptors
  • Some are hormones, enzymes, pigments, etc
• primary structure: Describes the sequence of amino acids, the positional info in a protein
• secondary structure:

  • One or more polypeptide chains are folded in the form of a helix
  • It has only right-handed helices
• tertiary structure:

  • Helical polypeptide chain is further folded like a hollow woolen ball.
  • 3d view
  • Necessary for many biological activities of proteins.
• quarternary structure: More than one polypeptide chain from the tertiary structure and each chain functions as subunits of protein