Structural studies of death receptors.

Area of Science:

• Structural biology
• Molecular signaling
• Cell biology

Background:

• Death receptors (DRs) and their ligands, primarily from the tumor necrosis factor (TNF) superfamily, are traditionally associated with programmed cell death.
• The functional repertoire of these receptors extends beyond apoptosis to encompass various nonapoptotic cellular processes.
• Understanding the intricate molecular mechanisms governing DR activation and downstream signaling is crucial for comprehending cellular fate.

Purpose of the Study:

• To provide a structural biology perspective on the characterization of death ligands and death receptors (DRs).
• To review the interactions between DRs, agonist ligands, inhibitors, and signaling molecules.
• To highlight the complexity of DR signaling and the challenges in elucidating activation mechanisms, including receptor clustering.

Main Methods:

• Review of existing structural data for TNF family death ligands and receptors.
• Analysis of reported interactions with ligands, inhibitors, and signaling proteins.
• Discussion of structural implications for receptor activation, clustering, and downstream signaling pathways.

Main Results:

• Structural characterization reveals the molecular basis for interactions between death ligands and receptors.
• The review underscores that DR functions are not limited to apoptosis, involving diverse nonapoptotic pathways.
• Structural insights into DR activation highlight the importance of receptor clustering in determining cellular outcomes.

Conclusions:

• The structural biology of death receptors and ligands reveals complex signaling networks.
• DR signaling is multifaceted, extending beyond programmed cell death to influence nonapoptotic cellular functions.
• Further structural and mechanistic studies are needed to fully understand DR activation, clustering, and posttranslational modifications in signaling.