Functions of Proteins

Protein have a wide variety of structures, therefore, they perform variable functions. Proteins are the molecules which carry out the cell activities and form the main structure of cell. It is estimated that the typical mammalian cell may have as many as 10.000 different proteins having a diverse array of function. As structural cables, protein provide mechanical support both within cell and outside their perimeter. As enzymes proteins vastly accelerate the rate of metabolic reactions. As hormones, growth factors and gene activators, proteins perform a wide variety of regulatory functions. As membrane receptors and transporters, proteins determine what type of substances should enter or leave the cells. Protein act as antibodies, antigens, fibrin etc.