Figure 121

Simplified scheme of ACh hydrolysis at the active center of ACh. Rectangular area represents the active center of the enzyme with its anionic and esteratic sites. Top, the initial bonding of ACh at the active center. The broken line at left represents electrostatic forces. The broken line at right represents the initial interaction between the serine oxygen of the enzyme and the carbonyl carbon of ACh. The ester linkage is broken, choline is liberated, and an acetylated enzyme intermediate is formed (middle). Finally, the acetylated intermediate undergoes hydrolysis to free the enzyme and generate acetic acid (bottom).

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