A highly purified RNA polymerase II elongation control system.
Studying the sensitivity of transcription to the nucleotide analog 5,6-dichloro-1-beta-d-ribofuranosylbenzimidazole has led to the discovery of a number of proteins involved in the regulation of transcription elongation by RNA polymerase II. We have developed a highly purified elongation control system composed of three purified proteins added back to isolated RNA polymerase II elongation complexes. Two of the proteins, 5,6-dichloro-1-beta-d-ribofuranosylbenzimidazole sensitivity-inducing factor (DSIF) and negative elongation factor (NELF), act as negative transcription elongation factors by increasing the time the polymerase spent at pause sites. P-TEFb reverses the negative effect of DSIF and NELF through a mechanism dependent on its kinase activity. TFIIF is a general initiation factor that positively affects elongation by decreasing pausing. We show that TFIIF functionally competes with DSIF and NELF, and this competition is dependent on the relative concentrations of TFIIF and NELF.
Renner
D B
DB
Department of Biochemistry, University of Iowa, Iowa City, Iowa 52242, USA.
Yamaguchi
Y
Y
Wada
T
T
Handa
H
H
Price
D H
DH
D009687:Nuclear Proteins / Q000302:isolation & purification / Q000502:physiology*; D042925:Positive Transcriptional Elongation Factor B; D017346:Protein Serine-Threonine Kinases / Q000502:physiology*; D012319:RNA Polymerase II / Q000502:physiology*; D014157:Transcription Factors / Q000302:isolation & purification / Q000502:physiology*; D019473:Transcription Factors, TFII; D014158:Transcription, Genetic; D035602:Transcriptional Elongation Factors
D009687:Nuclear Proteins; C112224:SUPT5H protein, human; D014157:Transcription Factors; D019473:Transcription Factors, TFII; D035602:Transcriptional Elongation Factors; C118437:negative elongation factor; D042925:Positive Transcriptional Elongation Factor B; D017346:Protein Serine-Threonine Kinases; D012319:RNA Polymerase II; C056604:transcription factor TFIIF