Death-associated protein 6

Overview

Diagram of the DAXX pathway

Death-associated protein 6 (DAXX) is a multifunctional protein involved in various cellular processes, including transcriptional regulation, apoptosis, and chromatin remodeling. DAXX is encoded by the DAXX gene and is ubiquitously expressed in human tissues.

Structure

DAXX is a nuclear protein that contains several functional domains, including a SUMO-interacting motif (SIM), a coiled-coil domain, and a C-terminal domain that interacts with other proteins. These domains enable DAXX to participate in diverse cellular functions by interacting with various partners.

Function

DAXX is primarily known for its role in apoptosis, where it acts as a mediator of programmed cell death. It interacts with the Fas receptor and other apoptotic proteins to promote cell death in response to stress signals.

Transcriptional Regulation

DAXX functions as a transcriptional co-repressor by interacting with histone deacetylases (HDACs) and other transcriptional regulators. It can modulate the expression of genes involved in cell cycle regulation and apoptosis.

Chromatin Remodeling

DAXX is involved in chromatin remodeling through its interaction with the ATRX protein. This interaction is crucial for the deposition of the histone variant H3.3 at telomeres and pericentromeric heterochromatin, which is important for maintaining genomic stability.

Pathway

The DAXX pathway is complex and involves multiple interactions with other proteins. DAXX can shuttle between the nucleus and the cytoplasm, and its localization is regulated by post-translational modifications such as SUMOylation and phosphorylation.

Clinical Significance

Mutations and dysregulation of DAXX have been implicated in various diseases, including cancer and neurodegenerative disorders. In cancer, DAXX mutations are often associated with pancreatic neuroendocrine tumors and gliomas.

Related Pages

• Apoptosis
• Chromatin remodeling
• Fas receptor
• Histone deacetylase
• ATRX