Daxx protein (IPR005012)

Short name: Daxx

Overlapping homologous superfamilies


Family relationships



Daxx is a ubiquitously expressed protein that functions, in part, as a transcriptional co-repressor through its interaction with a growing number of nuclear, DNA-associated proteins. Human Daxx contains four structural domains commonly found in transcriptional regulatory proteins: two predicted paired amphipathic helices, an acid-rich domain and a Ser/Pro/Thr (SPT)-rich domain. The post-translational modification status of the SPT-domain of hDaxx regulates its association with transcription factors such as Pax3 and ETS-1, effectively bringing hDaxx to sites of active transcription. Through its presence at the site of active transcription, hDaxx could then be able to associate with acetylated histones present in the nucleosomes and Dek that is associated with chromatin. Through its association with the SPT-domain of hDaxx, histone deacetylases may also be brought to the site of active transcription. As a consequence, nucleosomes in the vicinity of the site of active transcription will have the histone tails deacetylated, allowing the deactylated tail to bind to DNA, thereby leading to an inactive chromatin structure and transcriptional repression [PMID: 12140263].

The Daxx protein (also known as the Fas-binding protein) is thought to play a role in apoptosis as a component of nuclear promyelocytic leukemia protein (PML) oncogenic domains (PODS). Daxx associates with PODs through a direct interaction with PML, a critical component of PODs. The interaction is a dynamic, cell cycle regulated event and is dependent on the post-translational modification of PML by the small ubiquitin-related modifier SUMO-1.

Contributing signatures

Signatures from InterPro member databases are used to construct an entry.