Formation of the second phosphodiester bond creates a 3-nt product. This short transcript is still loosely associated with the RNA polymerase II initiation complex and can dissociate to yield abortive products, which are not further extended. The transcription complex still requires continued ATP-hydrolysis by TFIIH and remains sensitive to single-stranded oligo-nucleotide inhibition.
The open region (Ã?Â¢Ã¢â??Â¬Ã?â??transcription bubbleÃ?Â¢Ã¢â??Â¬Ã??) expands concomitant with the site of RNA-extension. In this case this region spans positions -9 to +3.
|RNA Polymerase II (unphosphorylated):TFIIF complex||DNA-directed RNA polymerase activity (0003899)|
|TFIIH||helicase activity (0004386)|
|Human immunodeficiency virus infectious disease||526||[HIV infection]|
|9405375||Three transitions in the RNA polymerase II transcription complex during initiation.||EMBO J||1998|
|11784853||Translocation after synthesis of a four-nucleotide RNA commits RNA polymerase II to promoter escape.||Mol Cell Biol||2002|