Tags: Protein.
DNA-directed RNA polymerases I II and III subunit RPABC1 is a protein that in humans is encoded by the POLR2E gene.This gene encodes the fifth largest subunit of RNA polymerase II the polymerase responsible for synthesizing messenger RNA in eukaryotes. This subunit is shared by the other two DNA-directed RNA polymerases and is present in two-fold molar excess over the other polymerase subunits.