The Pax3-FKHR oncoprotein is unresponsive to the Pax3- associated repressor hDaxx.
The Pax3-FKHR fusion protein is present in alveolar rhabdomyosarcoma and results from the t(2;13) (q35;q14) chromosomal translocation. Its oncogenic activity is dependent on a combination of protein-DNA and protein-protein interactions mediated by the Pax3 homeodomain recognition helix. In this report we demonstrate that human Daxx (hDaxx) interacts with Pax3 in vivo and with DNA-bound Pax3 in vitro. This interaction is mediated primarily through the homeodomain recognition helix with the additional involvement of the octapeptide domain and its N-terminal flanking amino acids. Through this interaction hDaxx represses the transcriptional activity of Pax3 by approximately 80%. The Pax3-FKHR fusion is unresponsive to this repressive effect despite an observed endogenous interaction with hDaxx in a rhabdomyosarcoma tumor cell line. Therefore, these data support the model that fusion of FKHR to Pax3 not only adds a strong transactivation domain, but also deregulates transcriptional control of Pax3 by overriding the natural repressive effect of hDaxx.[1]References
- The Pax3-FKHR oncoprotein is unresponsive to the Pax3-associated repressor hDaxx. Hollenbach, A.D., Sublett, J.E., McPherson, C.J., Grosveld, G. EMBO J. (1999) [Pubmed]
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