O-(5'-adenylyl)-L-tyrosyl-[protein] + ATP <=> O-[5'-(adenylyl-(5'->3')-adenylyl)]-L-tyrosyl-[protein] + diphosphate
o-(5'-adenylyl)-l-tyrosyl-[protein] + atp <=> o-[5'-(adenylyl-(5'->3')-adenylyl)]-l-tyrosyl-[protein] + diphosphate