ENZYMES

Enzymes are biological catalysts that speed up chemical reactions in cells.
Commonly found in detergents, aiding in stain removal through breakdown of substances.

Catalyst: A substance that alters or speeds up a chemical reaction without being consumed.
Enzymes: Proteins that act as catalysts; each reaction in a cell has a specific enzyme.
Enzymes increase reaction rates significantly, facilitating life processes.

The word 'enzyme' is derived from Greek: 'en' (meaning "in") and 'zyme' (meaning "yeast").
Enzymes play roles in vital biochemical processes: respiration, digestion, and photosynthesis.
Substrate: The chemical upon which an enzyme acts.
Active Site: The specific region of an enzyme where substrate binding occurs.

Simple Enzyme: Composed solely of proteins.
Conjugated Enzyme: Contains a non-protein component in addition to the protein structure.
- Apoenzyme: The protein part of a conjugated enzyme.
- Cofactor: The non-protein component that assists enzyme function.

Holoenzyme: The complete active enzyme formed when an apoenzyme binds to its cofactor.
Cofactors play a critical role in enhancing enzyme activity through additional reactions.

Simple Metal Ions: Essential minerals obtained from diet (e.g., Zn, Mg, Fe, Cu).
Small Organic Molecules (Coenzymes): Derived from nutrients, commonly involving vitamins (e.g., Vitamin B).

Metabolic Enzymes: Involved in energy production and detoxification.
Digestive Enzymes: Break down food for nutrient absorption (e.g., amylase for carbohydrates, protease for proteins, and lipase for fats).
Food Enzymes: Found in raw foods, they require cofactors for optimal activity.

Enzymes vary in their specificity towards substrates:
- Absolute Specificity: Catalyze only one reaction.
- Group Specificity: Target groups with certain functional groups.
- Linkage Specificity: Act on specific chemical bonds.
- Stereochemical Specificity: Target specific stereoisomers.

Enzymes have an optimal temperature range; activity generally increases with temperature up to a point.
Optimum Temperature: The temperature at which enzyme activity is maximized.

The availability of substrates influences enzyme activity; excess substrates can lead to saturation if enzymes are limited.

Competitive Inhibitors: Mimic substrates, competing for active site occupancy (e.g., antihistamines).
Noncompetitive Inhibitors: Bind to a different part of the enzyme, reducing activity without blocking the active site.
Irreversible Inhibitors: Permanently deactivate enzymes via covalent bonding to essential amino acids in the active site.

Diagnoses for diseases involve measuring enzyme levels (e.g., lactate dehydrogenase for heart disease).

Thiamine (Vitamin B1): Crucial for energy metabolism and nerve function.
Riboflavin (Vitamin B2): Important for energy production and cellular function.
Niacin (Vitamin B3): Plays a role in DNA repair and production of stress and sex hormones.
Pantothenic Acid (Vitamin B5): Necessary for the synthesis of coenzyme A, vital for fatty acid metabolism.
Pyridoxine (Vitamin B6): Involved in amino acid metabolism and neurotransmitter synthesis.
Cobalamin (Vitamin B12): Essential for red blood cell formation, neurological function, and DNA synthesis.
Ascorbic Acid (Vitamin C): An antioxidant that aids in collagen production and iron absorption.

Vitamin A: Important for vision, immune function, and skin health.
Vitamin D: Essential for calcium absorption and bone health.
Vitamin E: A powerful antioxidant that helps protect cells from oxidative damage and plays a role in immune function and skin health.

Understanding enzyme structure, function, and regulation is crucial for applications in health, nutrition, and biochemistry.