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. 2000 Dec 1;275(48):37612-8.
doi: 10.1074/jbc.M005739200.

EWS.Fli-1 fusion protein interacts with hyperphosphorylated RNA polymerase II and interferes with serine-arginine protein-mediated RNA splicing

L Yang  1 , H A Chansky, D D Hickstein
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Free article

EWS.Fli-1 fusion protein interacts with hyperphosphorylated RNA polymerase II and interferes with serine-arginine protein-mediated RNA splicing

L Yang et al. J Biol Chem. .
Free article

Abstract

Ewing's sarcoma displays a characteristic chromosomal translocation that results in fusion of the N-terminal domain of the Ewing's sarcoma protein (EWS) to the C-terminal DNA-binding domain of the ETS family transcription factor Fli-1 (Friend leukemia integration-1). EWS possesses structural motifs suggesting a role in transactivation as well as RNA binding. We demonstrate that wild-type EWS protein functions as an adapter molecule coupling transcription to RNA splicing by binding to hyperphosphorylated RNA polymerase II through the N-terminal domain of EWS and recruiting serine-arginine (SR) splicing factors through the C-terminal domain of EWS. The oncogenic EWS.Fli-1 fusion protein retains the ability to bind to hyperphosphorylated RNA polymerase II but lacks the ability to recruit SR proteins because of replacement of the C-terminal domain of EWS by Fli-1. In an in vivo splicing assay, the EWS.Fli-1 fusion protein inhibits SR protein-mediated E1A pre-mRNA splicing in a dominant-negative manner. These results indicate that EWS.Fli-1 interferes with the normal function of EWS and implicate uncoupling of gene transcription from RNA splicing in the pathogenesis of Ewing's sarcoma.

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