BIOCHEM 2EE3 Lecture Notes - Lecture 6: Tetrahedral Carbonyl Addition Compound, Serine Protease, Catalytic Triad

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A catalyst is a substance that increases the rate, or velocity, of a chemical reaction without itself being consumed in the reaction process. A thermodynamically favourable process is not made more favourable, nor is an unfavourable process made favourable, by the presence of a catalyst: the equilibrium state is just approached more quickly in the presence of a catalyst. Catalysts accelerate the approach to equilibrium for a given reaction- catalysts do not change the thermodynamic favourability of a reaction. Transferases catalyze transfer of functional groups from one molecule to another. Lyases catalyze removal of a group from, or addition of a group to, a double bond, or other cleavages involving electron rearrangement. Ligases catalyze reactions in which two molecules are joined. How enzymes act as catalysts: principles and examples. Role of a catalyst is to decrease deltag by facilitating the formation of the transition state. Interaction has extraordinary specificity through complementary binding interactions (lock and key model example)

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