Lecture Notes: Enzymes and Their Functions

Introduction to Enzymes

• Enzymes are proteins that act as catalysts in biochemical reactions.
• They speed up reactions that could happen on their own, making processes effective for life.
• Enzymes are specific to substrates due to their unique active sites.

Enzyme-Substrate Interaction

• Enzymes have active sites where substrates bind.
• Binding is specific: only certain substrates fit the enzyme's active site.
• Induced Fit Model:
  • The active site changes shape to bind substrates perfectly.
  • Enzymes can either build up or break down substrates into products.

Example: Lactase

• Lactase is an enzyme that breaks down lactose into digestible components.
• Lactose: A disaccharide sugar that many cannot digest efficiently without lactase.
• People lacking lactase enzyme are lactose intolerant.

Characteristics of Enzymes

• Enzymes are not used up in reactions; they act as catalysts.
• Examples in the digestive system:
  • Lipase: Breaks down lipids (fats).
  • Amylase: Breaks down starch.
  • Protease: Breaks down proteins.

Enzyme Helpers

• Cofactors and Coenzymes:
  • Assist enzymes by binding to substrates or active sites.
  • Essential for enzyme functionality.

Enzymes and Environmental Conditions

• Enzymes have ideal pH and temperature ranges for optimal function.
• Denaturation:
  • Occurs when enzymes are exposed to non-ideal conditions, altering their shape.
  • Denatured enzymes cannot bind substrates or function properly.

Relevance of Enzymes in Medicine

• Enzyme activity is crucial in regulating body processes.
• Many diseases are linked to enzyme production issues.

Conclusion

• Enzymes are integral to life processes and medical research.
• Stay curious about the roles and functions of enzymes in biology.