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A novel transcriptional coactivator, p52, functionally interacts with the essential splicing factor ASF/SF2
H Ge1, Y Si, A P Wolffe
1Laboratory of Molecular Embryology, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland 20892, USA. geh@box-g.nih.gov
Molecular Cell
|January 14, 1999
Summary
A newly identified transcriptional coactivator, p52, links gene transcription and pre-mRNA splicing. This protein interacts with transcription factors and splicing factor ASF/SF2, suggesting a role in coordinating these essential cellular processes.
Area of Science:
- Molecular Biology
- Gene Regulation
- Biochemistry
Background:
- Emerging evidence indicates that pre-mRNA splicing can occur concurrently with transcription (cotranscriptional splicing).
- The precise mechanisms linking transcription and splicing remain incompletely understood.
Purpose of the Study:
- To investigate the role of a novel transcriptional coactivator, p52, in the interplay between transcription and splicing.
- To determine if p52 influences both transcriptional activation and pre-mRNA splicing.
Main Methods:
- In vitro and in vivo interaction studies between p52, transcriptional factors, and splicing factor ASF/SF2.
- Immunofluorescence microscopy to assess the subcellular localization of endogenous p52 and ASF/SF2 in HeLa cells.
Main Results:
- p52 interacts with transcriptional activators and general transcription factors to enhance transcription.
- p52 directly interacts with the splicing factor ASF/SF2, modulating its splicing activity.
- Endogenous p52 and ASF/SF2 show significant colocalization within the nucleoplasm of HeLa cells.
Conclusions:
- p52 functions as a transcriptional coactivator.
- p52 acts as an adaptor molecule, coordinating pre-mRNA splicing with the transcriptional activation of class II genes.
- These findings provide novel insights into the mechanistic links between transcription and splicing.