RNA polymerase II CTD heptapeptide repeat Y1 phosphatase activity
Catalysis of the reaction: RNA polymerase II large subunit CTD heptapeptide repeat--phospho-L-tyrosine (consensus YSPTSPS)(position 1) + H2O = RNA polymerase II large subunit + phosphate.
GO:0008420
RNA polymerase II CTD heptapeptide repeat phosphatase activity
is_a
RNA polymerase II C-terminal domain Y1 phosphatase activity
exact