Which of the following amino acid residues would be attracted to the R group of

Question

Which of the following amino acid residues would be attracted to the R group of serine at pH=7.

a) Glutamate b) Aspartate c) Arginine d)a and b e) All of above f) None of above

I know that serine has O-H group and glutamate is CH2-COO-, aspartate is CH2-CH2-COO- and arginine ends with NH-C(-NH2)=NH2+. But I'm not sure which one will be attracted to serine. Is it only arginine, since it's polar? If one amino acid is neutral, will charged groups attract to it? I'm really confused as what will attract what. Please explain fully. Thanks

Explanation / Answer

Serine is a polar amino acid with no charge on its R group (OH group). Since the OH group in the amino acid has partial ionic charge it has the capability to form a weak ionic bond so it pairs with the amino acids like arginine, lysine and histidine to an extent, accounting for protein structure and stability.            .

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