CH369.Lecture7 - Figure 4.02 Structures and abbreviations...

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Unformatted text preview: Figure 4.02 Structures and abbreviations of the 15 standard amino acids. Chymotrypsin Case Study of an Enzyme What Is an Enzyme? A catalyst that accelerates the rate of chemical reaction . Mostly made of proteins. Recently, some RNA (ribozyme) has been found to have catalytic activities. Enzyme catalyzed reactions The enzymatic reaction is carried out in a specific location of enzyme known as the active site Enzymes apart from nonbiological catalysts is their reaction specificity, i.e., most enzymes are highly specific for their substrates and products If more than one protein catalyzes a given chemical reaction, these enzymes are called isozymes. All biochemical reaction: Addition of one substrate to another Removal of a group Rearrangement Nomenclature An enzyme is named by incorporating the suffix - ase into the name of its substrate; e.g., enzyme that cleaves peptide bonds is called protein ase , a prote ase , or a peptid ase Most enzyme names contain more descriptive words for its catalyzed reaction (also end with ase) Nomenclature Enzyme names indicate catalyzed reaction e.g., pyruvate decarboxylase Alanine aminotransferase How do enzymes work Consider reaction A-B + C-- A + B- C Reaction coordinate diagram for the reaction AB + C Activation energy Transition state Why is there a chemical reaction energy wall?- In a chemical reaction, old bonds in the reactant molecules have to be broken- geometric strain. As two molecules react, they form one larger molecule that is literally bent out of shape. This halfway point between reactants becoming products is known as the transition state . Effect of a catalyst on a chemical reaction.Effect of a catalyst on a chemical reaction....
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This note was uploaded on 04/03/2009 for the course CH 369 taught by Professor Kbrowning during the Spring '07 term at University of Texas at Austin.

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CH369.Lecture7 - Figure 4.02 Structures and abbreviations...

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