GO:0070513 death domain binding: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0070513 (death domain binding) is a molecular function describing the binding to a death domain (DD), a six-helix homotypic interaction module that forms oligomers [1,6].
• Death domain interactions are central to apoptosis and inflammation through activation of caspases and NF-kappaB [1,4].
• Key DD-containing proteins include RIPK1, TRADD, ZBP1, and p75NTR, which mediate cell death and survival signaling [1,7,8].
• Dysregulated DD binding contributes to cancer, neurodegeneration, and inflammatory diseases [2,5,8].
• CRISPR knockout, point mutation, and knock-in models are essential to dissect DD-mediated signaling [1,8].
• EDITGENE provides custom cell models and screening services to study death domain binding in disease contexts.
Description
Death domain binding (GO:0070513) is a molecular function defined as binding to a death domain (DD) of a protein. The DD is a homotypic protein interaction module composed of a bundle of six alpha-helices that can self-associate to form oligomers. This binding event is critical for the assembly of signaling complexes that regulate apoptosis and inflammation through activation of caspases and NF-kappaB [1,4]. Researchers study death domain binding to understand how cells decide between survival and death, and how dysregulation leads to diseases such as cancer and neurodegeneration [2,7,8]. The function is mediated by proteins such as RIPK1, TRADD, and ZBP1, which contain DD or related domains [1,3,8]. Understanding the structural and functional basis of DD binding provides insights into therapeutic targeting of cell death pathways [6,8].
death domain binding At A Glance
| GO ID | GO:0070513 |
|---|---|
| GO term | death domain binding |
| Ontology | molecular_function |
| Synonym | none |
| Major function | Binding to a death domain of a protein, mediating homotypic interactions that regulate apoptosis and inflammation [1,6]. |
| Definition source | QuickGO |
| Related domains | Death domain (DD), death effector domain (DED), caspase recruitment domain (CARD) |
| Key proteins | RIPK1, TRADD, ZBP1, p75NTR, MADD [1,2,7,8] |
| Disease relevance | Cancer, neurodegeneration, inflammatory diseases [2,5,8] |
What Is GO:0070513?
Death domain binding (GO:0070513) is the molecular function of selectively interacting with a death domain (DD) of a protein. The DD is a conserved protein-protein interaction module consisting of six alpha-helices that can form homotypic oligomers. This binding is involved in the regulation of apoptosis and inflammation via activation of caspases and NF-kappaB [1,6].
Why Is death domain binding Important in Cell Biology?
Death domain binding is a fundamental molecular function that governs cell fate decisions by assembling signaling platforms such as the death-inducing signaling complex (DISC) and the necrosome [1,3]. Its dysregulation is implicated in a wide range of human diseases, including cancer, where it can promote tumor cell survival or death [2,5], and neurodegenerative disorders, where aberrant apoptosis contributes to neuronal loss [7,8]. Understanding the specificity and regulation of DD binding is therefore crucial for developing targeted therapies that modulate apoptosis and inflammation [6,8].
• Regulates apoptosis through caspase activation [1,4].
• Controls inflammation via NF-kappaB signaling [1,8].
• Mediates necroptosis through RIPK1-RIPK3 interactions [1,3].
• Involved in cancer pathogenesis, e.g., cholangiocarcinoma via MADD.
• Contributes to neurodegeneration through p75NTR signaling.
• Target for therapeutic intervention in inflammatory diseases.
• Essential for host defense against pathogens via ZBP1.
• Provides structural basis for drug design targeting DD interactions.
• Key to understanding cell death pathways in development.
• Enables CRISPR screening to identify novel DD-binding proteins [1,8].
What Happens During death domain binding?
Initiation of death domain oligomerization
In simple terms: Death domains stick together to form a platform that starts cell death signaling.
Death domain binding begins with the homotypic oligomerization of DD-containing proteins, such as RIPK1 and TRADD, which assemble into higher-order complexes [1,6]. This oligomerization is driven by the six-helix bundle structure of the DD, allowing specific interactions that nucleate signaling platforms.
Recruitment of downstream adaptors
In simple terms: Once death domains cluster, they recruit other proteins to pass on the death signal.
Oligomerized DDs recruit downstream adaptor proteins containing death effector domains (DEDs) or caspase recruitment domains (CARDs), such as FADD and caspase-8, leading to the formation of the death-inducing signaling complex (DISC). This recruitment is essential for caspase activation and apoptosis.
Activation of caspases and NF-kappaB
In simple terms: The signal splits into two paths: one that kills the cell and one that triggers inflammation.
DD binding can lead to activation of initiator caspases (e.g., caspase-8) and subsequent effector caspases, resulting in apoptosis. Alternatively, it can activate NF-kappaB through RIPK1 ubiquitination and recruitment of IKK complexes, promoting inflammation and survival [1,8].
Regulation by post-translational modifications
In simple terms: Chemical tags on death domain proteins decide whether the cell lives or dies.
Ubiquitination, phosphorylation, and other modifications of DD-containing proteins modulate their binding affinities and signaling outcomes [1,8]. For example, RIPK1 ubiquitination by cIAPs promotes NF-kappaB activation, while deubiquitination favors cell death.
Key Genes Involved in GO:0070513 death domain binding
The following genes encode proteins that directly bind death domains or contain death domains, playing critical roles in apoptosis and inflammation.
| Gene | Major Role | Research Relevance |
|---|---|---|
| RIPK1 | Serine/threonine kinase with a death domain; central regulator of necroptosis and apoptosis | Key target for studying cell death and inflammation |
| TRADD | Adaptor protein with a death domain; mediates TNFR1 signaling | Modulating TRADD restores homeostasis and inhibits apoptosis |
| ZBP1 | Z-nucleic acid sensor with a death domain; triggers necroptosis | Mediates interferon-induced necroptosis |
| FADD | Adaptor with a death effector domain; bridges death receptors to caspases | Essential for DISC formation and apoptosis |
| CASP8 | Initiator caspase with DED; activates downstream caspases | Key effector of death domain signaling |
| MADD | Death domain-containing adaptor; regulates splicing and cell survival | Implicated in cholangiocarcinoma via lactylation |
| NGFR (p75NTR) | Neurotrophin receptor with a death domain; regulates neuronal survival | Structural hub for signaling in neurodegeneration |
| TNFRSF1A | TNF receptor with a death domain; activates NF-kappaB and apoptosis | Model for death domain binding studies |
| RIPK3 | Kinase with a RIP homotypic interaction motif; forms necrosome with RIPK1 | Critical for necroptosis execution |
| MLKL | Pseudokinase; executes necroptosis downstream of RIPK3 | Marker of necroptotic cell death |
| CASP10 | Initiator caspase with DED; involved in apoptosis | Role in death receptor signaling |
| CFLAR | Caspase-8 inhibitor with DED; regulates apoptosis | Modulates death domain binding outcomes |
| BCL10 | CARD-containing protein; activates NF-kappaB | Involved in immune signaling |
| PYCARD | Adaptor with CARD and PYD; forms inflammasome | Links death domain binding to inflammation |
| IKBKG | IKK gamma; mediates NF-kappaB activation downstream of DD | Key node in inflammatory signaling |
| TRAF2 | Adaptor; links DD signaling to NF-kappaB | Modulates cell survival |
How Is death domain binding Regulated?
Death domain binding is regulated by post-translational modifications, including ubiquitination and phosphorylation, which alter the affinity and specificity of DD interactions [1,8]. For example, RIPK1 ubiquitination by cIAP1/2 promotes NF-kappaB activation, while deubiquitination by CYLD favors caspase-8 activation and apoptosis. Additionally, the metabolite alpha-KG induces GSDMC-dependent pyroptosis through death receptor 6-activated caspase-8, linking metabolism to DD-mediated cell death. These regulatory layers ensure context-dependent outcomes of DD binding.
death domain binding and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| MADD | Intrahepatic cholangiocarcinoma | Knockout of MADD in cholangiocarcinoma cell lines |
| NGFR | Neurodegeneration | Point mutation of p75NTR death domain in neuronal cells |
| TRADD | Inflammatory diseases | Overexpression of TRADD mutants in HEK293T cells |
| ZBP1 | Interferon-induced necroptosis | Knockout of ZBP1 in macrophages |
| RIPK1 | Autoinflammatory diseases | Knock-in of RIPK1 death domain mutations in mice |
Death domain binding in cancer
Dysregulated death domain binding contributes to tumorigenesis by promoting cell survival or evading apoptosis. In intrahepatic cholangiocarcinoma, lactylation of nucleolin regulates RNA splicing of MADD, a death domain-containing adaptor, enhancing tumor pathogenesis. Targeting DD interactions is a potential therapeutic strategy in cancers dependent on NF-kappaB or apoptotic resistance.
Death domain binding in neurodegeneration
The p75 neurotrophin receptor (p75NTR) contains a death domain that mediates neuronal apoptosis and is implicated in neurodegenerative diseases such as Alzheimer's and Parkinson's. Structural insights into p75NTR DD binding provide a basis for designing inhibitors that block pathological cell death.
Death domain binding in inflammatory diseases
Aberrant DD binding can lead to excessive inflammation through NF-kappaB activation. Modulating TRADD, a key DD adaptor, restores cellular homeostasis and inhibits apoptosis, suggesting therapeutic potential for inflammatory disorders. ZBP1-mediated necroptosis also contributes to inflammation in response to interferon.
From death domain binding-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does RIPK1 DD binding regulate necroptosis? | RIPK1 knockout cells reconstituted with DD mutants |
| How does TRADD modulation affect apoptosis? | TRADD overexpression and point mutants |
| What is the role of ZBP1 DD in interferon signaling? | ZBP1 knockout macrophages |
| Does p75NTR DD mutation affect neuronal survival? | Knock-in of p75NTR DD mutations in neurons |
| Can MADD splicing be targeted in cancer? | MADD knockout in cholangiocarcinoma cells |
| What is the structural basis of DD oligomerization? | Recombinant DD proteins for crystallography |
How to Study the death domain binding Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Co-immunoprecipitation | Protein-protein interactions | Detect DD binding in cell lysates |
| Surface plasmon resonance | Binding affinity and kinetics | Quantify DD-DD interactions |
| X-ray crystallography | 3D structure of DD complexes | Determine oligomerization interfaces |
| CRISPR knockout screening | Genes affecting DD signaling | Identify novel regulators |
| Flow cytometry | Apoptosis and necroptosis | Validate cell death phenotypes |
| Caspase activity assay | Caspase activation | Measure downstream apoptosis |
| Immunoblotting | Protein expression and modifications | Assess ubiquitination of DD proteins |
Structural biology of death domain binding
X-ray crystallography and NMR spectroscopy are used to determine the three-dimensional structures of death domains and their complexes, revealing the six-helix bundle and oligomerization interfaces [6,7]. These methods provide atomic-level insights into binding specificity and guide drug design.
Biochemical assays for DD interactions
Co-immunoprecipitation, pull-down assays, and surface plasmon resonance (SPR) measure direct binding between DD-containing proteins [1,8]. These techniques quantify affinity and kinetics, and can be used to screen for inhibitors.
CRISPR screening to identify DD-binding regulators
Genome-wide CRISPR knockout screens can identify genes that modulate death domain binding and downstream signaling, such as novel regulators of necroptosis or apoptosis [1,8]. Hits are validated by targeted knockout and functional assays.
Functional assays for cell death
Apoptosis and necroptosis are assessed by flow cytometry (Annexin V/PI), caspase activity assays, and LDH release [1,3]. These readouts link DD binding to cellular outcomes and are essential for validating CRISPR models.
How CRISPR Can Be Used to Study GO:0070513 death domain binding
Knockout
CRISPR knockout of genes encoding DD-containing proteins (e.g., RIPK1, TRADD, ZBP1) is used to study their essential roles in apoptosis and inflammation [1,3,8]. Knockout cell lines provide clean backgrounds to test re-expression of wild-type or mutant proteins.
Point Mutation
Point mutations in death domains (e.g., RIPK1 DD mutations) can disrupt specific binding interfaces, allowing dissection of signaling outcomes [1,6]. CRISPR-mediated point mutation introduces these changes at endogenous loci for physiological relevance.
Knock-in
Knock-in of tagged or mutant DD proteins (e.g., GFP-RIPK1) enables live-cell imaging and proteomic analysis of DD complexes [1,8]. Knock-in models also allow study of disease-associated mutations in vivo.
Overexpression
Overexpression of DD-containing proteins or their mutants (e.g., TRADD) is used to amplify signaling and identify dominant-negative effects. This approach is valuable for biochemical purification of DD complexes.
How EDITGENE Supports death domain binding Research
Researchers studying death domain binding-related genes often need to determine whether a candidate gene is causally involved in apoptosis, inflammation, or disease pathogenesis. EDITGENE provides comprehensive CRISPR services to generate precisely engineered cell models, enabling functional validation of DD-binding proteins and their mutants.
Contact EDITGENE today to design your custom CRISPR model for death domain binding research.
Frequently Asked Questions About death domain binding
What is death domain binding?
Death domain binding (GO:0070513) is the molecular function of binding to a death domain, a six-helix module that mediates protein-protein interactions in apoptosis and inflammation [1,6].
What genes are involved in death domain binding?
Key genes include RIPK1, TRADD, ZBP1, FADD, CASP8, and NGFR, which encode proteins with death domains or death effector domains [1,3,4,7,8].
How does death domain binding regulate apoptosis?
It nucleates signaling complexes that recruit and activate caspases, leading to programmed cell death.
What diseases are associated with death domain binding?
Cancer, neurodegeneration, and inflammatory diseases are linked to dysregulated death domain interactions [2,5,7,8].
What is the structure of a death domain?
The death domain is a bundle of six alpha-helices that can form homotypic oligomers.
How can I study death domain binding in the lab?
Use co-immunoprecipitation, SPR, CRISPR knockout, and structural biology approaches [1,6,8].
What is the role of RIPK1 death domain?
RIPK1 death domain restrains ZBP1- and TRIF-mediated cell death and inflammation.
How does ZBP1 mediate necroptosis?
ZBP1 senses Z-nucleic acids and activates necroptosis through its death domain and RHIM.
Can death domain binding be targeted therapeutically?
Yes, modulating TRADD or blocking p75NTR DD interactions are potential strategies [7,8].
What CRISPR models are available for death domain research?
EDITGENE offers knockout, point mutation, knock-in, and overexpression models for DD genes [1,8].
Conclusion
Death domain binding (GO:0070513) is a pivotal molecular function that orchestrates cell death and inflammation through homotypic interactions of six-helix death domains. Its dysregulation underlies cancer, neurodegeneration, and inflammatory diseases, making it a prime target for therapeutic intervention. CRISPR-based models and advanced screening technologies are essential to dissect the complex signaling networks involving death domains. EDITGENE provides comprehensive services to accelerate research in this field.
References
- 1. Imai T et al.. 2024. The RIPK1 death domain restrains ZBP1- and TRIF-mediated cell death and inflammation.. Immunity 57(7):1497-1513.e6 PMID: 38744293
- 2. Yang L et al.. 2024. Nucleolin lactylation contributes to intrahepatic cholangiocarcinoma pathogenesis via RNA splicing regulation of MADD.. J Hepatol 81(4):651-666 PMID: 38679071
- 3. Yang D et al.. 2020. ZBP1 mediates interferon-induced necroptosis.. Cell Mol Immunol 17(4):356-368 PMID: 31076724
- 4. Valmiki MG et al.. 2009. Death effector domain-containing proteins.. Cell Mol Life Sci 66(5):814-30 PMID: 18989622
- 5. Zhang JY et al.. 2021. The metabolite α-KG induces GSDMC-dependent pyroptosis through death receptor 6-activated caspase-8.. Cell Res 31(9):980-997 PMID: 34012073
- 6. Park HH. 2019. Domain swapping of death domain superfamily: Alternative strategy for dimerization.. Int J Biol Macromol 138:565-572 PMID: 31351149
- 7. Yuan W et al.. 2019. Death domain of p75 neurotrophin receptor: a structural perspective on an intracellular signalling hub.. Biol Rev Camb Philos Soc 94(4):1282-1293 PMID: 30762293
- 8. Xu D et al.. 2020. Modulating TRADD to restore cellular homeostasis and inhibit apoptosis.. Nature 587(7832):133-138 PMID: 32968279
