WE report here the isolation of a human RNA polymerase II complex cont
aining a subset of the basal transcription factors and the human homol
ogues of the yeast SRB (for suppressors of RNA polymerase B) proteins(
1-3). The complex contains transcriptional coactivators and increases
the activation of transcription, In addition, some components of the R
NA polymerase II complex participate in DNA repair.