obsolete phosphorylation of RNA polymerase II C-terminal domain serine 5 residues involved in recruitment of mRNA capping enzyme to RNA polymerase II holoenzyme complex (obsolete GO:1900018)
OBSOLETE. Any phosphorylation of RNA polymerase II C-terminal domain serine 5 residues that is involved in recruitment of mRNA capping enzyme to RNA polymerase II holoenzyme complex.