RNA polymerase II CTD heptapeptide repeat Y1 kinase activity
Catalysis of the reaction: ATP + RNA polymerase II large subunit CTD heptapeptide repeat (consensus YSPTSPS) = ADP + H+ + RNA polymerase II large subunit phosphotyrosine (position 1).
GO:0008353
RNA polymerase II CTD heptapeptide repeat kinase activity
is_a
RNA polymerase II C-terminal domain Y1 kinase activity
exact