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The answer is asparagine interactions between aspartate and arginine side chains at neutral pH. The remaining amino acids are very hydrophilic because their substituents have either positive or negative charges in water solution at a neutral pH.
What side chain does arginine have?
The amino acid arginine has the formula (H2N)(HN)CN(H)(CH2)3CH(NH2)CO2H.
A guanidino group is attached to a typical amino acid framework in the molecule.
The carboxylic acid is deprotonated (CO2) and both the amino and guanidino groups are protonated, resulting in a cation at physiological pH.
The guanidine group in arginine is the precursor for nitric oxide production. it is a white, water-soluble solid, like all amino acids.
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