2.7.10.1 ATP + a [protein]-L-tyrosine = ADP + a [protein]-L-tyrosine phosphate - - 2.7.10.1 ATP + a [protein]-L-tyrosine = ADP + a [protein]-L-tyrosine phosphate active site structure, activation mechanism 660921 2.7.10.1 ATP + a [protein]-L-tyrosine = ADP + a [protein]-L-tyrosine phosphate reaction mechanism 490931 2.7.10.1 ATP + a [protein]-L-tyrosine = ADP + a [protein]-L-tyrosine phosphate regulation of enzyme activity involves the activation loop, a polypeptide region outside the active site cleft, which is reversibly phosphorylated 490931