ENZYMES. Enzymes are proteins that act on a substance called a substrate. enzyme substrate -------------> product In the above reaction the enzyme's active.

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Presentation transcript:

ENZYMES

Enzymes are proteins that act on a substance called a substrate. enzyme substrate > product In the above reaction the enzyme's active site binds with the substrate. Enzymes are proteins that act on a substance called a substrate. enzyme substrate > product In the above reaction the enzyme's active site binds with the substrate.

This active site is specific for each different type of substrate. Even the slightest change in the form of this site will alter the enzyme's function. This active site is specific for each different type of substrate. Even the slightest change in the form of this site will alter the enzyme's function.

Factors affecting enzyme activity: Temperature, pH, and a particular chemical that specifically influences that enzyme. Enzymes work best at temperatures between 35 o and 40 o C in humans. pH range between 6 and 8 promotes optimum function. Salts inhibit enzyme action.

Coenzymes: are non protein chemicals that help enzymes act. Many of these coenzymes are vitamins.

Enzyme Inhibitors: 1. Competitive inhibitors: These chemicals mimic or resemble the normal substrate molecule.

2. Noncompetitive inhibitors: These chemicals attach themselves to the enzyme at another point and alters the enzyme's shape. This causes the enzyme's active site to become non receptive to the substrate.

3. Allosteric regulation: Most enzymes that are affected by this type of regulation are composed of 2 or more polypeptide chains. These enzymes fluctuate between an active and inactive substance.

The enzyme contains 2 sites the active site and the allosteric site, located away from the active site.

The allosteric site must contain an activator substance that will allow the active site to remain open. If the activator is missing then an inhibitor occupies the space and inactivates the enzyme. The allosteric site must contain an activator substance that will allow the active site to remain open. If the activator is missing then an inhibitor occupies the space and inactivates the enzyme.

Feedback Inhibition: The most common form of metabolic control. The process involves the switching off of the metabolic pathway by its end product.