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PMID:9450929

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Citation

Wada, T, Takagi, T, Yamaguchi, Y, Ferdous, A, Imai, T, Hirose, S, Sugimoto, S, Yano, K, Hartzog, GA, Winston, F, Buratowski, S and Handa, H (1998) DSIF, a novel transcription elongation factor that regulates RNA polymerase II processivity, is composed of human Spt4 and Spt5 homologs. Genes Dev. 12:343-56

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.

Links

PubMed PMC316480

Keywords

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; RNA Polymerase II/metabolism; Saccharomyces cerevisiae/chemistry; Saccharomyces cerevisiae Proteins; Sensitivity and Specificity; Sequence Homology, Amino Acid; Transcription Factors/chemistry; Transcription Factors/isolation & purification; Transcription Factors/pharmacology; Transcription, Genetic/drug effects; Transcription, Genetic/genetics; Transcriptional Activation/drug effects; Transcriptional Elongation Factors

Significance

Annotations

Gene product Qualifier GO Term Evidence Code with/from Aspect Extension Notes Status

HUMAN:SPT4H

part_of

GO:0032044: DSIF complex

ECO:0000314: direct assay evidence used in manual assertion

C

Seeded From UniProt

complete

HUMAN:SPT4H

involved_in

GO:0000122: negative regulation of transcription by RNA polymerase II

ECO:0000314: direct assay evidence used in manual assertion

P

Seeded From UniProt

complete

HUMAN:SPT4H

involved_in

GO:0032786: positive regulation of DNA-templated transcription, elongation

ECO:0000314: direct assay evidence used in manual assertion

P

Seeded From UniProt

complete

HUMAN:SPT4H

involved_in

GO:0032785: negative regulation of DNA-templated transcription, elongation

ECO:0000314: direct assay evidence used in manual assertion

P

Seeded From UniProt

complete

HUMAN:SPT4H

involved_in

GO:0006368: transcription elongation from RNA polymerase II promoter

ECO:0000314: direct assay evidence used in manual assertion

P

Seeded From UniProt

complete

HUMAN:SPT4H

involved_in

GO:0045944: positive regulation of transcription by RNA polymerase II

ECO:0000314: direct assay evidence used in manual assertion

P

Seeded From UniProt

complete

HUMAN:SPT4H

enables

GO:0046982: protein heterodimerization activity

ECO:0000353: physical interaction evidence used in manual assertion

UniProtKB:O00267

F

Seeded From UniProt

complete

HUMAN:SPT5H

enables

GO:0046982: protein heterodimerization activity

ECO:0000353: physical interaction evidence used in manual assertion

UniProtKB:P63272

F

Seeded From UniProt

complete

HUMAN:SPT5H

involved_in

GO:0045944: positive regulation of transcription by RNA polymerase II

ECO:0000314: direct assay evidence used in manual assertion

P

Seeded From UniProt

complete

HUMAN:SPT5H

involved_in

GO:0032786: positive regulation of DNA-templated transcription, elongation

ECO:0000314: direct assay evidence used in manual assertion

P

Seeded From UniProt

complete

HUMAN:SPT5H

involved_in

GO:0032785: negative regulation of DNA-templated transcription, elongation

ECO:0000314: direct assay evidence used in manual assertion

P

Seeded From UniProt

complete

HUMAN:SPT5H

part_of

GO:0032044: DSIF complex

ECO:0000314: direct assay evidence used in manual assertion

C

Seeded From UniProt

complete

HUMAN:SPT5H

involved_in

GO:0006368: transcription elongation from RNA polymerase II promoter

ECO:0000314: direct assay evidence used in manual assertion

P

Seeded From UniProt

complete

HUMAN:SPT5H

involved_in

GO:0000122: negative regulation of transcription by RNA polymerase II

ECO:0000314: direct assay evidence used in manual assertion

P

Seeded From UniProt

complete


See also

References

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