Step-by-step explanation:
Amino acids capable of forming hydrogen bonds with a lysine residue in a protein typically have functional groups that can participate in hydrogen bonding. Lysine has a positively charged amino group (NH3+) as part of its side chain. Therefore, an amino acid with a functional group capable of forming a hydrogen bond with this amino group could interact with lysine.
One such amino acid is aspartic acid (Asp or D). Aspartic acid has a negatively charged carboxyl group (COO-) in its side chain. This carboxyl group can form hydrogen bonds with the positively charged amino group of lysine (NH3+), creating a stable interaction within the protein structure.
So, aspartic acid (Asp) is an example of an amino acid capable of forming hydrogen bonds with a lysine residue in a protein. This interaction contributes to the overall stability and structure of the protein.