1 proteins

• Proteins


  Macromolecular nitrogen-containing compounds composed of many amino acids linked by peptide bonds
• Proteins are the most abundant organic compounds and constitute a major part of the body dry weight (10-12 kg in adults)
• Functions of proteins


  • Static (structural)
  • Dynamic (enzymes, hormones, clotting factors, receptors)
• Biological importance of proteins

  • Important components of organisms
  • Important biological function
  • Can be oxidized to produce energy
• Proteins are important components of organisms
• Proteins have important biological functions
• Proteins can be oxidized to produce energy
• Distribution of proteins


  • All organs
  • Tissues
  • Each cell
  • Each part of the cell
• Proteins account for 45% of the dry weight of the human body (even 80% in organs and tissues such as spleen, lung, and striated muscle)
• Biological functions of proteins

  • Biological catalyst (enzyme)
  • Regulation on metabolism
  • Immunological protection
  • Transportation and storage of substances
  • Taking part in signal transduction
• A bout half of the body protein (predominantly collagen) is present in the supportive tissue (skeleton and connective) while the other half is intracellular
• Protein turnover


  Protein turnover is the balance between protein synthesis and protein degradation