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PMID: 9450929 Published · ppublish English Journal Article Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, P.H.S.

DSIF, a novel transcription elongation factor that regulates RNA polymerase II processivity, is composed of human Spt4 and Spt5 homologs.

Genes & development ·Vol. 12 ·No. 3 ·1998-02-01 ·Pages 343-56

Wada T, Takagi T, Yamaguchi Y, Ferdous A, Imai T, Hirose S, Sugimoto S, Yano K, Hartzog GA, Winston F, Buratowski S, Handa H

Abstract

We report the identification of a transcription elongation factor from HeLa cell nuclear extracts that causes pausing of RNA polymerase II (Pol II) in conjunction with the transcription inhibitor 5,6-dichloro-1-beta-D-ribofuranosylbenzimidazole (DRB). This factor, termed DRB sensitivity-inducing factor (DSIF), is also required for transcription inhibition by H8. DSIF has been purified and is composed of 160-kD (p160) and 14-kD (p14) subunits. Isolation of a cDNA encoding DSIF p160 shows it to be a homolog of the Saccharomyces cerevisiae transcription factor Spt5. Recombinant Supt4h protein, the human homolog of yeast Spt4, is functionally equivalent to DSIF p14, indicating that DSIF is composed of the human homologs of Spt4 and Spt5. In addition to its negative role in elongation, DSIF is able to stimulate the rate of elongation by RNA Pol II in a reaction containing limiting concentrations of ribonucleoside triphosphates. A role for DSIF in transcription elongation is further supported by the fact that p160 has a region homologous to the bacterial elongation factor NusG. The combination of biochemical studies on DSIF and genetic analysis of Spt4 and Spt5 in yeast, also in this issue, indicates that DSIF associates with RNA Pol II and regulates its processivity in vitro and in vivo.

MeSH Terms
Amino Acid Sequence Chromosomal Proteins, Non-Histone Dichlororibofuranosylbenzimidazole/pharmacology Fungal Proteins/chemistry HeLa Cells Humans Molecular Sequence Data Nuclear Proteins/chemistry Nucleic Acid Synthesis Inhibitors/pharmacology RNA Polymerase II/drug effects,metabolism Saccharomyces cerevisiae/chemistry Saccharomyces cerevisiae Proteins Sensitivity and Specificity Sequence Homology, Amino Acid Transcription Factors/chemistry,isolation & purification,pharmacology Transcription, Genetic/drug effects,genetics Transcriptional Activation/drug effects Transcriptional Elongation Factors
Chemicals
Chromosomal Proteins, Non-Histone Fungal Proteins Nuclear Proteins Nucleic Acid Synthesis Inhibitors SPT4 protein, S cerevisiae Saccharomyces cerevisiae Proteins Transcription Factors Transcriptional Elongation Factors SPT5 transcriptional elongation factor Dichlororibofuranosylbenzimidazole RNA Polymerase II
Authors & Affiliations
12 authors, click to expand affiliations / ORCID
Wada T
Faculty of Bioscience and Biotechnology, Tokyo Institute of Technology, Midori-ku, Yokohama 226, Japan.
Takagi T
Yamaguchi Y
Ferdous A
Imai T
Hirose S
Sugimoto S
Yano K
Hartzog G A
Winston F
Buratowski S
Handa H
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Article Info
Journal
Genes & development
Abbr.
Genes Dev
ISSN
0890-9369
DOI
10.1101/gad.12.3.343
Published
1998-02-01
Pages
343-56
Language
English
Region
United States
NLM ID
8711660
PMCID
PMC316480
Subset
IM
Grants
NIGMS NIH HHS · GM32967 · United States
External Links
PubMed source DOI: 10.1101/gad.12.3.343 PMC Full Text View journal details
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