Final answer:
Ionic bonding and hydrogen bonding are the two stronger interactions between amino acids. They contribute to the stability and structure of proteins.
Step-by-step explanation:
The two stronger interactions between amino acids are ionic bonding and hydrogen bonding.
- Ionic bonding: Ionic bonds result from electrostatic attractions between positively and negatively charged side chains of amino acids. For example, the mutual attraction between an aspartic acid carboxylate ion and a lysine ammonium ion helps maintain the folding of proteins.
- Hydrogen bonding: Hydrogen bonding forms between a highly electronegative oxygen atom or a nitrogen atom and a hydrogen atom attached to another oxygen atom or a nitrogen atom in polar amino acid side chains. Hydrogen bonding plays a crucial role in both intra- and intermolecular interactions of proteins.
These two interactions contribute to the stability and structure of proteins.