Proteins can bind to other proteins and simple molecules, sometimes acting as enzymes by facilitating chemical reactions within the bound molecules (without changing the structure of the protein itself).
Protini zinaweza kushikamana na protini zingine na molekuli rahisi, wakati mwingine hufanya kama enzymes kwa kuwezesha athari za kemikali ndani ya molekuli zilizofungwa (bila kubadilisha muundo wa protini yenyewe).