Poly(ADP-ribose) Binds to the Splicing Factor ASF/SF2 and Regulates Its Phosphorylation by DNA Topoisomerase I*

Human DNA topoisomerase I plays a dual role in transcription, by controlling DNA supercoiling and by acting as a specific kinase for the SR-protein family of splicing factors. The two activities are mutually exclusive, but the identity of the molecular switch is unknown. Here we identify poly(ADP-ribose) as a physiological regulator of the two topoisomerase I functions. We found that, in the presence of both DNA and the alternative splicing factor/splicing factor 2 (ASF/SF2, a prototypical SR-protein), poly(ADP-ribose) affected topoisomerase I substrate selection and gradually shifted enzyme activity from protein phosphorylation to DNA cleavage. A likely mechanistic explanation was offered by the discovery that poly(ADP-ribose) forms a high affinity complex with ASF/SF2 thereby leaving topoisomerase I available for directing its action onto DNA. We identified two functionally important domains, RRM1 and RS, as specific poly(ADP-ribose) binding targets. Two independent lines of evidence emphasize the potential biological relevance of our findings: (i) in HeLa nuclear extracts, ASF/SF2, but not histone, phosphorylation was inhibited by poly(ADP-ribose); (ii) an in silico study based on gene expression profiling data revealed an increased incidence of alternative splicing within a subset of inflammatory response genes that are dysregulated in cells lacking a functional poly(ADP-ribose) polymerase-1. We propose that poly(ADP-ribose) targeting of topoisomerase I and ASF/SF2 functions may participate in the regulation of gene expression.

• Publication year

  2008

• Venue

  Journal of Biological Chemistry

• Publication date

  2008-07-18

• Fields of study

  Biology, Medicine

• Identifiers
  DOI 10.1074/jbc.M709495200PMID 18495665
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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