In the muscarinic binding site, which amino acid participates in van der Waals interactions?

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Multiple Choice

In the muscarinic binding site, which amino acid participates in van der Waals interactions?

Explanation:
Van der Waals interactions come from nonpolar surface-to-surface contacts, so residues that provide a large, hydrophobic contact area are the ones most effective. Tryptophan brings a bulky, nonpolar indole ring with a big surface, giving extensive van der Waals contact with the ligand in the muscarinic binding pocket and helping to stabilize binding through these noncovalent interactions. The other residues listed (histidine, serine, asparagine) are more polar or charged and typically engage in hydrogen bonding or ionic interactions rather than broad van der Waals contacts, making tryptophan the best fit for this type of interaction in the site.

Van der Waals interactions come from nonpolar surface-to-surface contacts, so residues that provide a large, hydrophobic contact area are the ones most effective. Tryptophan brings a bulky, nonpolar indole ring with a big surface, giving extensive van der Waals contact with the ligand in the muscarinic binding pocket and helping to stabilize binding through these noncovalent interactions. The other residues listed (histidine, serine, asparagine) are more polar or charged and typically engage in hydrogen bonding or ionic interactions rather than broad van der Waals contacts, making tryptophan the best fit for this type of interaction in the site.

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