This observation is explained by the concept of molecular complementarity.
Because there are so many noncovalent interactions happening when proteins, such as an antibody and an antigen, match up in a way that creates many noncovalent bonds, even weak noncovalent bindings can effectively produce strong interactions between two proteins.
When the structures of molecules or macromolecules fit together, physical, non-covalent interactions cause them to associate reversibly with one another. This is known as molecular complementarity.
Functions including information translation and storage, enzymatic operations, structural self-organization, and molecule defense against deteriorative processes all depend on molecular complementarity.
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