This gene encodes the largest subunit of RNA polymerase II, the polymerase responsible for synthesizing messenger RNA in eukaryotes. The product of this gene contains a carboxy terminal domain composed of heptapeptide repeats that are essential for polymerase activity. These repeats contain serine and threonine residues that are phosphorylated in actively transcribing RNA polymerase. In addition, this subunit, in combination with several other polymerase subunits, forms the DNA binding domain of the polymerase, a groove in which the DNA template is transcribed into RNA.
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Protein Aliases: DNA-directed RNA polymerase II largest subunit, RNA polymerase II 220 kd subunit; DNA-directed RNA polymerase II subunit A; DNA-directed RNA polymerase II subunit RPB1; DNA-directed RNA polymerase III largest subunit; polymerase (RNA) II (DNA directed) polypeptide A, 220kDa; polymerase (RNA) II subunit A; RNA polymerase II subunit B1; RNA-directed RNA polymerase II subunit RPB1
Gene Aliases: hRPB220; hsRPB1; POLR2; POLR2A; POLRA; RPB1; RPBh1; RpIILS; RPO2; RPOL2
UniProt ID: (Human) P24928
Entrez Gene ID: (Human) 5430