although bacteriophage t4 late promoters are selectively recognized by escherichia coli rna polymerase bearing a single protein encoded by t4 gene 55 ( gp55 ) , efficient transcription at these promoters requires enhancement by the three t4 dna polymerase accessory proteins , bound to distal `` '' mobile enhancer '' '' sites .
C0035681
rna polymerase
C0040649
transcription