How do we predict the function of protein from its secondary structure?.?
Well, the function of a protein is based on its structure. It’s structure ultimately depends on the amino acid sequence of the proteins primary structure. Secondary structure is due to hydrogen bonding between the nitrogenous bases that make up the amino acids in the primary structure. Bonds are furthermore formed, etc. to form tertiary structure. So, if from the secondary structure one can determine the amino acid chain of the primary structure, then perhaps with that knowledge they can predict the proteins function. That, or if they predict the forthcoming bonds that occur in the protein’s secondary structure that makes the protein’s tertiary 3D structure.