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CAS BI 108 (112)
Chapter 8.4

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CAS BI 108
Francis Monette

8.4: How do Enzymes Work? Enzymes can orient substrates: Need to proper orientation to interact. Enzymes can induce strain in the substrate: stretching the bonds between monomers, to make bonds unstable and more reactive to the substrate Enzymes can temporarily add chemical groups to substrates: side chains can make substrates more chemically reactive  Acid-Base Catalysis: acidic or basic side chains of amino acids in active site transfer H+ to or from the substrate to destabilize covalent bond  Covalent Catalysis: functional group forms a temporary covalent bond  Metal ion catalysis: metal ions gain or lose electrons without detaching from enzymes Molecular structure determines enzyme function  Active site is specific to substrate. Meaning, that depends on tertiary structure of the enzyme: hydrogen bonds, attraction/repulsion of electric-c
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