E2 Protein Classes & Conjugated Proteins

enzymes

catalyze biochemical reactions

hormones

messengers that regular bodily functions

storage proteins

store essental substances for immediate availability

transport proteins

carry substances throught blood & through the cell membranes

structural proteins

support & maintain shape of cell

protective proteins

provide defense against invaders & protect from injury

contractile proteins

do mechanical work

glycoproteins

covalently bound carbohydrates (eg. form receptors on cell surface)

lipoproteins

covalently bound to lipids (eg. transport cholesterol through blood)

metalloproteins

metal ion (trace minerals) for structure stabilization or catalytic function

phosphoproteins

covalently bound phosphate groups used to activate or deactivate a protein or provide binding sites for protein attachment

hemoproteins

contain heme groups/porphyrin rings (eg. oxygen transporters, drug metabolizing enzymes, energy producing enzymes)

nucleoproteins

contain ribonucleic acids (ribosomes used in protein synthesis)