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Proteins do all kinds of things. Enzymes are proteins that are essential to life. Enzymes are very specialized and act as an organic catalyst to speed up reactions.

There are so many different kinds of proteins with all different sorts of functions. There are membrane proteins which have many different subcategories, generally for transportation of nutrients in and out of a cell or receptor proteins recognizing nearby cells. There are enzymes that speed up chemical reactions by reducing the activation energy of the reactions. And some proteins form the cytoskeleton of cells.

every organic form of life is formed out of proteins

it is a secondary source of energy (4.6 k Cal/g)

it is a bio accelerator -> substance that increases the rate of a chemical reaction (metabolic reactions) aka ENZYMES

it has tranport duties like the hemoglobine

the muscle contraction is given by two proteins actine and miosine

the give you protection with the inmunoglobulins or the antibodies