What are the five functions of protein?

The top five functions of proteins are:

1. Enzymes are proteins which catalyze reactions.
2. Motor Proteins such as myosin are capable of generating mechanical forces which are essential for locomotion.
3. Antibodies which defend body against foreign invaders are also proteins.
4. Hemoglobin transports Oxygen throughout the body.
5. Blood clotting proteins such as fibrin check excess loss of blood.