Classification of Proteins and their Functions

Structural

provide structural components

Collagen —> tendons and cartilage
Keratin —> hair, skin, wool, nails

Contractile

make muscle moves

Myosin and Actin are contractile proteins

Transport

carry essential substances throughout the body

Hemoglobin —> transport oxygen
Lipoproteins —> tranpsort lipids

Storage

store nutrients

Casein —> stores protein in milk
Ferritin —> stores iron in the spleen and liver

Hormone

regulate body metabolism and the nervous system

Insulin —> regulates blood glucose level
Growth hormone —> regulate body growth

Enzyme

catalyze biochemical reactions in the cells

Sucrase —> catalyzes the hydrolysis of sucrose
Trypsin —> catalyzes the hydrolysis of proteins

Protection

recognize and destroy foreign substances

Immunoglobulins stimulate immune response