Proteins have a three-dimensional structure that gives them a specific shape and allows them to perform many different functions in living organisms. Which one of these is not a function of proteins that depends on their structure?

Protein function is directly related to the structure of that protein. A protein's specific shape determines its function. If the three-dimensional structure of the protein is altered because of a change in the structure of the amino acids, the protein becomes denatured and does not perform its function as expected.