Digestion:
* Amylase: Breaks down starch into simpler sugars like maltose. Found in saliva and pancreatic juice.
* Pepsin: Breaks down proteins into smaller peptides. Found in the stomach.
* Lipase: Breaks down fats into fatty acids and glycerol. Found in the pancreas and small intestine.
* Lactase: Breaks down lactose (milk sugar) into glucose and galactose. Found in the small intestine.
Metabolism:
* Catalase: Breaks down hydrogen peroxide (a toxic byproduct of metabolism) into water and oxygen. Found in almost all living organisms.
* Alcohol dehydrogenase: Converts ethanol (alcohol) into acetaldehyde, a step in the detoxification of alcohol. Found in the liver.
* DNA polymerase: Synthesizes new DNA strands during DNA replication.
* RNA polymerase: Synthesizes RNA from a DNA template.
* Hexokinase: Catalyzes the first step in glycolysis, the breakdown of glucose for energy.
Other:
* Restriction enzymes: Cut DNA at specific sequences, used in genetic engineering.
* Luciferase: Produces light in fireflies.
* Transaminases: Transfer amino groups between molecules, important in amino acid metabolism.
* Kinases: Add phosphate groups to molecules, important in signaling pathways.
Examples of enzyme catalysts in action:
* Milk digestion: Lactase breaks down lactose, allowing individuals who can produce this enzyme to digest milk.
* Wound healing: Collagenases break down damaged collagen, allowing new tissue to form.
* Photosynthesis: Rubisco, a key enzyme in photosynthesis, fixes carbon dioxide from the atmosphere into organic compounds.
This is just a small sample of the vast number of enzyme catalysts that exist in living organisms. Each enzyme has a specific function and plays a critical role in maintaining life.
