The process of introducing a phosphate group to a tyrosine residue of a JAK (Janus Activated Kinase) protein, thereby activating it.
Synonyms:
exact_synonym:
activation of JAK protein; activation of JAK protein by tyrosine phosphorylation
narrow_synonym:
activation of JAK1 kinase activity; activation of JAK1 protein; activation of JAK2 kinase activity; activation of JAK2 protein; tyrosine phosphorylation of JAK1 protein; tyrosine phosphorylation of JAK2 protein
broad_synonym:
positive regulation of JAK protein activity by tyrosine phosphorylation