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Enzymes What are enzymes? Specialized proteins What do they do?They act as catalysts in chemical reactions in our bodies.
What’s a catalyst? A catalyst is a substance that brings about a reaction without being changed in the reaction. Enzymes increase the rate of reaction in our body at least 1 million times
Action of Catalysts: Basically, here’s what catalysts do:
Enzymes continued… The object enzymes work upon are called substrates.Most enzymes are named according to what they work upon. The way this is done is by changing the ending of the substrate to –ase.
Naming Enzymes!!! Let’s do some examples: Substrate Enzyme SucraseSucrose Lipid Lipase Protein Protease
How do enzymes work? Enzyme activity relies completely on the shape of the protein (remember, enzymes are proteins…). Each enzyme works on ONE (1) and only ONE (1) substrate
Enzymes working continued…Surface of each enzyme is a region called the active site. The active site fits the shape of the substrate the enzyme works on.
Examples of active sites:
More active sites:
How do enzymes and substrates fit together?There are 2 main theories as to how this happens: 1) Lock-and-Key Model 2) Induced-Fit Model
Lock-and-Key Model Enzyme have a rigid structure (like a key), that fits one specific substrate (the lock).
Lock-and-Key Model + +
Induced-Fit Model Enzyme is not rigidIt changes shape when it comes into contact with a substrate. Based on recent studies, the induced-fit model is the accepted theory as to how enzymes function.
Induced-Fit Model + +
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Sucrose (C 12 H 22 O 11 ) Glucose (C 6 H 12 O 6 ) Fructose (C 6 H 12 O 6 ) Sucrase.
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ALL ABOUT ENZYMES POSTER
Enzymes All enzymes are proteins. Not all proteins are enzymes. Enzymes are catalysts. A catalyst is a substance which increases the rate of chemical reaction.
Enzymes. Enzymes are Catalysts Catalysts lower the activation energy of a reaction. Catalysts lower the activation energy of a reaction. Makes the reaction.
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