Learning Outcomes:
i. Define structural and functional proteins.
ii. Identify examples of structural and functional proteins.
iii. Describe the roles of structural and functional proteins in the body.
i. Structural Proteins
Structural proteins provide support and structure to cells and tissues. They are essential for maintaining the shape and integrity of the body. Examples of structural proteins include:
Collagen: Collagen is the most abundant protein in the human body. It is found in skin, bones, tendons, and other connective tissues. Collagen provides strength and flexibility to these tissues.
Keratin: Keratin is the main protein in hair, skin, and nails. It is a hard and strong protein that protects these tissues from damage.
Elastin: Elastin is a protein that allows tissues to stretch and recoil. It is found in blood vessels, lungs, and skin. Elastin allows these tissues to return to their original shape after being stretched.
ii. Functional Proteins
Functional proteins are involved in a variety of cellular processes, including metabolism, transport, and signaling. They are essential for the proper functioning of all cells and tissues. Examples of functional proteins include:
Enzymes: Enzymes are proteins that catalyze (speed up) chemical reactions. Enzymes are involved in all aspects of metabolism, from digesting food to producing energy.
Hormones: Hormones are proteins that regulate various bodily functions, such as growth, metabolism, and reproduction. Hormones are produced by glands and travel through the bloodstream to their target cells.
Antibodies: Antibodies are proteins that protect the body from infection. Antibodies are produced by the immune system and bind to foreign invaders, such as bacteria and viruses.
iii. Roles of Structural and Functional Proteins in the Body
Structural and functional proteins play essential roles in the body. Structural proteins provide support and structure to cells and tissues, while functional proteins are involved in a variety of cellular processes. Without these proteins, the body would not be able to function properly.
Real-world applications of structural and functional proteins
Scientists are continuing to develop new uses for structural and functional proteins. For example, researchers are developing protein-based nanoparticles that can be used to deliver drugs to specific cells in the body.
Structural and functional proteins are two important classes of proteins that play essential roles in the body. Structural proteins provide support and structure, while functional proteins are involved in a variety of cellular processes.