RNA Polymerase II, DNA Directed Polypeptide B (POLR2B)

POLR2B encodes the second largest subunit of RNA polymerase II, the polymerase responsible for synthesizing messenger RNA in eukaryotes.

This subunit, in combination with at least two other polymerase subunits, forms a structure within the polymerase that maintains contact in the active site of the enzyme between the DNA template and the newly synthesized RNA.The predicted amino acid sequence of 1,174 residues (calculated molecular mass of 133,896 Da) was derived from the longest open reading frame and compared to the sequences of homologous subunits of polymerases of eukaryotic, archaic, and bacterial origin.