What distance between the acetyl O and N of acetylcholine supports activation of muscarinic receptors?

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Multiple Choice

What distance between the acetyl O and N of acetylcholine supports activation of muscarinic receptors?

Explanation:
The distance between the acetyl oxygen and the nitrogen in acetylcholine reflects how stretched the head group is to fit the muscarinic receptor’s binding pocket. For activation, the molecule must present its positively charged ammonium and the ester oxygen in the right spatial relationship so they can engage the same set of receptor residues that drive the conformational change of the GPCR. A distance around 4.4 angstroms gives the proper separation for the head group to simultaneously interact with key binding-site features—allowing electrostatic and hydrogen-bonding contacts that stabilize the active conformation. If the groups are too close, the head group cannot align with all necessary residues; if too far apart, essential contacts are lost. Therefore, 4.4 Å best matches the geometry required for muscarinic receptor activation.

The distance between the acetyl oxygen and the nitrogen in acetylcholine reflects how stretched the head group is to fit the muscarinic receptor’s binding pocket. For activation, the molecule must present its positively charged ammonium and the ester oxygen in the right spatial relationship so they can engage the same set of receptor residues that drive the conformational change of the GPCR.

A distance around 4.4 angstroms gives the proper separation for the head group to simultaneously interact with key binding-site features—allowing electrostatic and hydrogen-bonding contacts that stabilize the active conformation. If the groups are too close, the head group cannot align with all necessary residues; if too far apart, essential contacts are lost. Therefore, 4.4 Å best matches the geometry required for muscarinic receptor activation.

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