Aside from getting a proteinogenic amino acid, tyrosine has a appropriate role by advantage of the phenol functionality. It occurs in proteins that are allotment of arresting transduction processes. It functions as a receiver of phosphate groups that are transferred by way of protein kinases (so-called receptor tyrosine kinases). Phosphorylation of the hydroxyl accumulation changes the action of the ambition protein.
A tyrosine balance aswell plays an important role in photosynthesis. In chloroplasts (photosystem II), it acts as an electron donor in the abridgement of breakable chlorophyll. In this process, it undergoes deprotonation of its phenolic OH-group. This abolitionist is after bargain in the photosystem II by the four amount manganese clusters.