autophosphorylation

noun

au·​to·​phos·​phor·​y·​la·​tion ˌȯ-tō-ˌfäs-ˌfȯr-ə-ˈlā-shən 

: phosphorylation of an organic compound (such as an enzyme) by its own residues

Accordingly, if the autophosphorylation of receptor tyrosine kinases is suppressed pharmacologically, the assembly of the downstream signaling complexes may be halted, providing a chance to slow the progression of certain cancers.

—John D. Scott and Tony Pawson, Science

autophosphorylate

ˌȯ-tō-ˌfäs-ˈfȯr-ə-ˌlāt 

transitive verb

autophosphorylated; autophosphorylating

The intracellular β-subunit regions, like that of the EGF [epidermal growth factor] receptor, possess tyrosine kinase activity and a tyrosine residue that is autophosphorylated in response to insulin binding.

—Keith Wilson, in Principles and Techniques of Practical Biochemistry, 5th edition