RNA polymerase II transcription complexes are susceptible to transcriptional stalling and arrest, when extending nascent transcripts to 30-nt. This susceptibility depends on presence on down-stream DNA, the particular DNA-sequence of the template and presence of transcription factors. Transcription factor TFIIH remains associated to the RNA pol II elongation complex until position +30. At this stage transcription elongation factor TFIIS can rescue stalled transcription elongation complexes. The transcription bubble varies between 13- and 22-nt in size.
Zawel, L, Kumar, KP, Reinberg, D
McKean, D, Pal, M, Luse, DS
Tan, S, Conaway, JW, Dvir, A, Conaway, RC
Fiedler, U, Timmers, HT
DNA-directed 5'-3' RNA polymerase activity of RNA Polymerase II (unphosphorylated):TFIIF complex [nucleoplasm]
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