Proteins are one of the most abundant organic molecules in living systems and have the most diverse range of functions of all macromolecules. Proteins may be structural, regulatory, contractile, or protective. They may serve in transport, storage, or membranes, or they may be toxins or enzymes. Each cell in a living system may contain thousands of proteins, each with a unique function. Their structures, like their functions, vary greatly. They are all. However, amino acid polymers arranged in a linear sequence.
|Digestive Enzymes||Amylase, lipase, pepsin, trypsin||Help in food by catabolizing nutrients into monomeric units|
|Transport||Hemoglobin, albumin||Carry substances in the blood or lymph throughout the body|
|Structural||Actin, tubulin, keratin||Construct different structures, like the cytoskeleton|
|Hormones||Insulin, thyroxine||Coordinate different body systems’ activity|
|Defense||Immunoglobulins||Protect the body from foreign pathogens|
|Contractile||Actin, myosin||Effect muscle contraction|
|Storage||Legume storage proteins, egg white (albumin)||Provide nourishment in early embryo development and the seedling|