ch369_f09_chap6_notes - Enzymes - Biological Catalysts...

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Unformatted text preview: Enzymes - Biological Catalysts (with chymotrypsin as an example) (chapter 6 of text) Example of a useful biochemical reaction: Peptide bond hydrolysis . peptide hydrolysis reaction: This reaction takes years without a catalyst. Some ways to increase reaction rates of slow reactions: 1) increase temperature (not very practical for living things) 2) use enzyme as a catalyst to lower the activation energy of a reaction Chymotrypsin catalyzes peptide bond hydrolysis. Protease - cleaves peptide bonds (example = chymotrypsin). Transferase - transfers functional group. Isomerase - convert one isomer to another. Ligase - Joining of 2 molecules together. Example: DNA ligase (requires ATP) etc. Some classes of enzymes Reaction coordinate diagrams How do enzymes increase reaction rates? By lowering the free energy of the transition state. Transition state An enzyme can raise the local concentration of reactants (by binding them close together), and orient them most effectively for a reaction to occur....
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ch369_f09_chap6_notes - Enzymes - Biological Catalysts...

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