Question

do fibrous proteins other than collagen have a tertiary structure?

Answer 1

Yes fibrous proteins other than collagen can have tertiary structure . These are elastin and fibroin.

Fibrous proteins are also called scleroproteins, that provide structural support to cells and tissues.

Fibrous proteins include keratin, collagen, elastin, and fibroin. These are found in bones, muscles, tendons and connective tissue.

Keratin is present in hair and nails. It has primary and secondary structure of protein.

Collagen has three polypeptide chains twisted in a left handed helical structure which gives three dimensional structure to collagen.

Elastin has secondary structure mostly but can have tertiary structure too, when Proline in elastin-like polymers is efficiently hydroxylated under certain conditions.

Fibroin is present in silk where it has mostly beta pleated sheet of secondary structure, and can have tertiary structure also.