Page 2: Enzyme Inhibition and Cofactors

The second page delves into enzyme inhibition mechanisms and the role of cofactors in enzymatic reactions. It presents a detailed comparison between competitive and non-competitive inhibition, along with their effects on reaction rates.

Definition: Cofactors are small molecules that bind with enzymes to improve the shape of the active site.

Highlight: Competitive inhibitors can be overcome by increasing substrate concentration, while non-competitive inhibition cannot be reversed this way.

Example: Chloride ions act as cofactors for salivary amylase, improving how well starch fits into the active site.

Vocabulary:

• Competitive inhibition: When molecules similar to the substrate block the active site
• Non-competitive inhibition: When molecules bind away from the active site but change the enzyme's structure

The page emphasizes that while competitive inhibition is usually reversible, non-competitive inhibition typically results in permanent denaturation of the enzyme.

Page 1: Enzyme Structure and Function

The first page explores the fundamental aspects of enzyme structure and their catalytic function. Enzymes are described as globular proteins with specific tertiary structures containing active sites. These biological catalysts are soluble in water and their activity is influenced by both pH and temperature.

Definition: Enzymes are metabolic catalysts that speed up reactions without being consumed in the process.

Highlight: The optimal temperature range for most enzymes is 40-50°C, beyond which denaturation occurs.

Example: Different types of bonds are broken by specific enzymes - peptide bonds by proteases, glycosidic bonds by carbohydrases, and ester bonds by lipases.

Vocabulary: Denaturation refers to the process where an enzyme's tertiary structure breaks down, rendering it non-functional.

The page also details two main theories of enzyme-substrate interaction:

1. Lock-and-Key Hypothesis: Where the enzyme's active site perfectly matches the substrate
2. Induced-fit Hypothesis: Where the enzyme's shape slightly adjusts as the substrate binds