Transport some proteins are reponsible for the transportation of smaller molecules from one part of the body to another, transport across cell membranes, etc. An example is hemoglobin, which transports oxygen from the lungs to cells throughout the body. Storage Myoglobin is an example of a storage protein. Myoglobin stores oxygen in muscles so that during exercise a ready supply of oxygen is available in the muscle tissue. Hormones serve as chemical messengers, carrying signals from one part of the body to another.
Some proteins mediate the interpretation of cellular signals, like hormones.
Catalysis - Enzymes Enzymes catalyze the chemical reactions that allow cells to function. Fibrous proteins are not water-soluble. Globular proteins are compact, vaguely spherical-shaped proteins. All the non-structural types of proteins are globular proteins. Alpha helix and beta sheet are examples.