GO:0044877 protein-containing complex binding: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0044877 (protein-containing complex binding) is a molecular function describing the selective binding of a protein or other molecule to a macromolecular complex, not to a free monomer.
• This term is central to understanding how stable multi-protein machines such as the TATA-binding-protein-containing complex, inflammasomes, and WD40-repeat deubiquitinase complexes are recognized and regulated.
• Dysregulated complex binding underlies diverse pathologies, including cancer, neurodegeneration, and autoinflammatory disease.
• Key experimental approaches include affinity purification, proximity labeling, and CRISPR-based perturbation of complex subunits.
• EDITGENE provides knockout, point-mutation, knock-in, overexpression, and CRISPR library screening services to dissect complex-binding mechanisms.
• The term is distinct from binding to a single protein and is often studied alongside complex assembly and phase-separation phenomena.
Description
GO:0044877, protein-containing complex binding, is a molecular function defined by the Gene Ontology as binding to a macromolecular complex. This term captures interactions that occur when a protein or other ligand recognizes an assembled multi-subunit machine, rather than an isolated polypeptide. It is a critical annotation for researchers studying how cellular machines are assembled, regulated, and targeted by therapeutics. The importance of this function is illustrated by the TATA-binding-protein-containing complex, whose mitotic regulation depends on complex-level binding events, and by the WD40-repeat protein-containing deubiquitinase complex, where complex binding governs catalytic activity and substrate specificity. In innate immunity, nucleic acid-sensing inflammasomes are activated through binding to protein-containing complexes, linking this molecular function directly to inflammatory signaling. Because many disease-associated mutations alter complex interfaces, GO:0044877 provides a framework for interpreting genetic variants and designing targeted experiments.
protein-containing complex binding At A Glance
| GO ID | GO:0044877 |
|---|---|
| GO term | protein-containing complex binding |
| Ontology | molecular_function |
| Synonym | macromolecular complex binding; protein complex binding |
| Definition | Binding to a macromolecular complex. |
| Major function | Recognition and interaction with assembled multi-protein machines |
| Example complexes | TATA-binding-protein-containing complex; WD40-repeat deubiquitinase complex; inflammasome complexes |
| Disease relevance | Cancer, neurodegeneration, autoinflammatory disorders |
| Research methods | Affinity purification, proximity labeling, CRISPR perturbation, structural biology |
What Is GO:0044877?
In our own words, GO:0044877 describes the function of selectively and non-covalently interacting with a macromolecular assembly that contains protein components. This includes binding to heteromeric complexes, homomeric complexes, and protein-nucleic acid complexes where the protein component is part of a larger macromolecular entity. The term is agnostic to the chemical nature of the binding partner as long as the partner is a protein-containing complex, and it is distinct from binding to a free protein monomer or to a small molecule.
Why Is protein-containing complex binding Important in Cell Biology?
GO:0044877 is important because it defines a layer of molecular recognition that is essential for nearly every cellular process, from transcription and DNA replication to immune sensing and protein homeostasis. Unlike binding to a single protein, complex binding often requires a specific quaternary arrangement, meaning that mutations affecting complex assembly can abolish this function without altering the individual subunits. This term therefore helps researchers interpret how disease mutations, post-translational modifications, and therapeutic compounds impact the assembly and recognition of macromolecular machines.
• Defines how cells recognize assembled machines rather than individual proteins.
• Essential for transcriptional regulation via TATA-binding-protein-containing complexes.
• Governs deubiquitinase complex function and substrate targeting.
• Central to inflammasome activation and innate immune signaling.
• Implicated in DNA replication origin recognition by protein-DNA complexes.
• Links to neurodegeneration through aberrant complex assembly and phase transitions.
• Provides a framework for interpreting cancer-associated mutations at complex interfaces.
• Enables targeted drug discovery against protein-protein interaction surfaces.
• Supports CRISPR-based dissection of complex subunit function.
• Facilitates biomarker development for complex-driven diseases.
What Happens During protein-containing complex binding?
Recognition of the assembled complex
In simple terms: The binding partner first identifies the fully assembled machine, not its individual parts.
The initial step in protein-containing complex binding is the selective recognition of a macromolecular assembly. For example, the TATA-binding-protein-containing complex is recognized as a unit during mitotic regulation, and this recognition depends on the complex being properly assembled. Similarly, the WD40-repeat protein-containing deubiquitinase complex presents a composite surface that is bound by regulators and substrates. This step often involves conformational epitopes that are absent in isolated subunits, making the interaction highly specific.
Stable association and complex stabilization
In simple terms: Once recognized, the binding partner locks onto the complex and can stabilize or remodel it.
After recognition, binding can stabilize the complex or induce conformational changes. In the case of the WD40-repeat deubiquitinase complex, binding of regulatory proteins modulates catalytic activity and substrate specificity. For inflammasomes, nucleic acid-sensing platforms assemble into protein-containing complexes that recruit and activate caspases, and binding events are required for signaling. This stage is often driven by multivalent interactions that increase avidity and specificity.
Functional consequences and signaling output
In simple terms: The binding event changes what the complex does, often triggering a cellular response.
The functional outcome of complex binding can be catalytic, structural, or signaling-related. For instance, origin binding protein-containing protein-DNA complex formation at herpes simplex virus type 1 oriS is required for origin-dependent DNA replication. In the immune system, inflammasome complex binding leads to caspase-1 activation and cytokine release. These downstream effects are often the readout used to study GO:0044877 in experimental systems.
Regulation and disassembly
In simple terms: Binding is reversible and is controlled by cellular signals, so complexes can be taken apart when needed.
Complex binding is dynamically regulated. Mitotic regulation of the TATA-binding-protein-containing complex shows that cell-cycle signals can alter complex recognition. In disease, mutations can accelerate or disrupt binding, as seen in ALS-associated phase transitions of FUS, where aberrant complex assembly contributes to pathology. Regulation can occur through post-translational modifications, competitive binders, or changes in complex composition.
Key Genes Involved in GO:0044877 protein-containing complex binding
The following genes and proteins are experimentally linked to protein-containing complex binding, either as complex subunits, binding partners, or regulators.
| Gene | Major Role | Research Relevance |
|---|---|---|
| TBP | Core subunit of TATA-binding-protein-containing complex | Mitotic regulation of transcription complex binding |
| FUS | RNA-binding protein that undergoes phase transitions | ALS-associated complex assembly and binding |
| ADIPOQ | Adiponectin, forms multimeric complexes | Adiponectin-resistance in obesity |
| WD40-repeat proteins | Scaffold subunits of deubiquitinase complexes | Deubiquitinase complex catalysis and regulation |
| NLRP3 | Inflammasome sensor forming protein complexes | Nucleic acid-sensing inflammasome activation |
| AIM2 | Inflammasome sensor binding DNA-protein complexes | Innate immune complex recognition |
| CASP1 | Effector caspase recruited to inflammasomes | Inflammasome complex signaling |
| HSV-1 origin binding protein | Binds protein-DNA complex at oriS | Viral DNA replication complex formation |
| Ouabain-binding proteins | Plasma proteins binding ouabain | Cardiac glycoside complex interactions |
| ATP1A1 | Na+/K+-ATPase, target of ouabain | Ouabain-binding protein studies |
| TBP-associated factors | Components of TBP-containing complexes | Transcription complex assembly |
| USP family proteins | Deubiquitinases in WD40-repeat complexes | Complex binding and catalysis |
| CARD domains | Interaction modules in inflammasome complexes | Complex assembly in innate immunity |
| Pyrin domain proteins | Inflammasome adaptors | Complex binding in inflammation |
| FUS partner proteins | RNA-binding complex components | Neurodegenerative complex assembly |
| Adiponectin receptors | Bind multimeric adiponectin complexes | Metabolic complex binding |
| HSV-1 DNA polymerase | Replication complex component | Viral protein-DNA complex binding |
How Is protein-containing complex binding Regulated?
Protein-containing complex binding is regulated at multiple levels. Cell-cycle-dependent phosphorylation can alter recognition of the TATA-binding-protein-containing complex during mitosis. Inflammasome complex binding is controlled by post-translational modifications and cellular stress signals. Phase separation and concentration-dependent assembly can also regulate binding, as shown for FUS, where disease mutations accelerate liquid-to-solid transitions. Additionally, metabolic states such as adiponectin resistance can influence the availability of multimeric complexes for binding.
protein-containing complex binding and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| FUS | Amyotrophic lateral sclerosis | Knock-in of ALS-associated FUS mutations |
| NLRP3 | Autoinflammatory syndromes | Knockout and point-mutation models |
| AIM2 | Innate immune disorders | Overexpression and knockout cell lines |
| WD40-repeat deubiquitinase subunits | Cancer | Knockout and tagged knock-in for complex purification |
| ADIPOQ | Obesity and insulin resistance | Overexpression and knockout models |
Neurodegeneration and aberrant complex assembly
In amyotrophic lateral sclerosis, mutations in FUS accelerate a liquid-to-solid phase transition that alters protein-containing complex binding and promotes pathological aggregation. This illustrates how dysregulated complex recognition can drive neurodegeneration.
Autoinflammatory and infectious disease
Nucleic acid-sensing inflammasomes depend on protein-containing complex binding to assemble and activate caspase-1, and dysregulation of this process contributes to autoinflammatory disorders. Viral replication complexes, such as the herpes simplex virus type 1 origin binding protein-DNA complex, also rely on complex binding for efficient DNA replication.
Cancer and metabolic disease
WD40-repeat protein-containing deubiquitinase complexes are implicated in cancer through their roles in protein stability and signaling, making complex binding a potential therapeutic target. In metabolic disease, adiponectin-resistance in obesity involves altered binding of multimeric adiponectin complexes to their receptors.
From protein-containing complex binding-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of a complex subunit abolish binding? | Knockout cell line |
| Does a disease mutation alter complex recognition? | Point-mutation knock-in |
| Can a tagged subunit pull down the complex? | Tagged knock-in |
| Does overexpression drive aberrant complex formation? | Overexpression cell line |
| Which genes regulate complex binding? | CRISPR library screening |
| What is the interactome of a complex? | Bioinformatics and proteomics |
How to Study the protein-containing complex binding Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Affinity purification-MS | Protein-protein interactions | Identifying complex components |
| Proximity labeling | Spatial interactome | Transient complex binding |
| CRISPR knockout | Loss-of-function effects | Testing subunit requirement |
| Point-mutation knock-in | Allele-specific effects | Disease variant analysis |
| Surface plasmon resonance | Binding affinity and kinetics | Complex interaction studies |
| Cryo-EM | Structural interface | Complex architecture |
| Bioinformatics | Network and pathway analysis | Interpreting complex binding data |
Affinity purification and mass spectrometry
Affinity purification of tagged complex subunits followed by mass spectrometry is a standard method to identify protein-containing complex binding partners. This approach has been used to characterize WD40-repeat deubiquitinase complexes and TATA-binding-protein-containing complexes.
Proximity labeling and imaging
Proximity labeling techniques such as BioID or APEX can capture transient complex binding events in living cells. Imaging approaches can visualize complex assembly and phase transitions, as demonstrated for FUS.
CRISPR perturbation and functional assays
CRISPR knockout or point-mutation models allow researchers to test the functional consequences of disrupting complex binding. For example, inflammasome complex binding can be perturbed by knocking out sensor or adaptor proteins.
Biochemical and structural analysis
Reconstitution assays, surface plasmon resonance, and cryo-EM can measure binding affinity and resolve complex interfaces. These methods are essential for understanding how complexes like the origin binding protein-DNA complex form.
How CRISPR Can Be Used to Study GO:0044877 protein-containing complex binding
Knockout
CRISPR knockout of a complex subunit can abolish protein-containing complex binding and reveal its functional importance. For example, knocking out inflammasome components prevents complex assembly and downstream signaling.
Point Mutation
Point-mutation knock-in models can mimic disease-associated variants that alter complex interfaces. This is particularly useful for studying mutations that affect binding without disrupting protein expression, as seen in FUS phase transition studies.
Knock-in
Tagged knock-in of complex subunits enables endogenous complex purification and tracking. This approach is valuable for studying WD40-repeat deubiquitinase complexes and TATA-binding-protein-containing complexes.
Overexpression
Overexpression of complex subunits or binding partners can drive aberrant complex formation and reveal dominant effects. This is often used to model adiponectin complex biology in metabolic studies.
How EDITGENE Supports protein-containing complex binding Research
Researchers studying protein-containing complex binding-related genes often need to determine whether a candidate gene is causally involved in complex assembly, recognition, or downstream signaling. EDITGENE provides a comprehensive suite of CRISPR-based services to generate precisely engineered cell models for such investigations.
Contact EDITGENE today to design your custom CRISPR model for protein-containing complex binding research.
Frequently Asked Questions About protein-containing complex binding
What is GO:0044877 protein-containing complex binding?
GO:0044877 is a Gene Ontology molecular function term defined as binding to a macromolecular complex, which includes multi-protein machines and protein-nucleic acid complexes.
What genes are involved in protein-containing complex binding?
Genes such as TBP, FUS, NLRP3, AIM2, and WD40-repeat deubiquitinase subunits are experimentally linked to this function.
How is protein-containing complex binding studied?
Common methods include affinity purification-mass spectrometry, proximity labeling, CRISPR perturbation, and structural biology.
Why is protein-containing complex binding important in disease?
Dysregulated complex binding contributes to neurodegeneration, autoinflammatory diseases, cancer, and metabolic disorders.
What is the difference between protein binding and protein-containing complex binding?
Protein binding refers to interaction with a single protein, while protein-containing complex binding specifically involves an assembled macromolecular complex.
Can CRISPR be used to study protein-containing complex binding?
Yes, CRISPR knockout, point-mutation knock-in, and tagged knock-in models are widely used to dissect complex binding mechanisms.
What are examples of protein-containing complexes?
Examples include the TATA-binding-protein-containing complex, WD40-repeat deubiquitinase complex, and inflammasomes.
How does phase separation relate to protein-containing complex binding?
Phase separation can concentrate proteins and promote complex binding, and disease mutations in FUS accelerate this process.
What services does EDITGENE offer for complex binding research?
EDITGENE offers knockout, point-mutation, knock-in, overexpression, CRISPR library screening, and bioinformatics services.
Is protein-containing complex binding relevant to cancer?
Yes, WD40-repeat deubiquitinase complexes and their binding interactions are implicated in cancer and are being explored as therapeutic targets.
Conclusion
GO:0044877 protein-containing complex binding is a fundamental molecular function that governs how cells recognize and regulate multi-protein machines. Its roles span transcription, immunity, viral replication, and metabolism, with direct implications for neurodegeneration, cancer, and inflammatory diseases. Understanding this function requires integrated experimental approaches, from CRISPR-based perturbation to structural and proteomic analysis. EDITGENE provides the tools and expertise to accelerate discovery in this field.
References
- 1. Patel A et al.. 2015. A Liquid-to-Solid Phase Transition of the ALS Protein FUS Accelerated by Disease Mutation.. Cell 162(5):1066-77 PMID: 26317470
- 2. Engin A. 2017. Adiponectin-Resistance in Obesity.. Adv Exp Med Biol 960:415-441 PMID: 28585210
- 3. White RJ et al.. 1995. Mitotic regulation of a TATA-binding-protein-containing complex.. Mol Cell Biol 15(4):1983-92 PMID: 7891693
- 4. Villamil MA et al.. 2013. The WD40-repeat protein-containing deubiquitinase complex: catalysis, regulation, and potential for therapeutic intervention.. Cell Biochem Biophys 67(1):111-26 PMID: 23797609
- 5. Xiao TS. 2015. The nucleic acid-sensing inflammasomes.. Immunol Rev 265(1):103-11 PMID: 25879287
- 6. Isler JA et al.. 2001. Origin binding protein-containing protein-DNA complex formation at herpes simplex virus type 1 oriS: role in oriS-dependent DNA replication.. J Virol 75(15):6808-16 PMID: 11435559
- 7. Parhami-Seren B et al.. 2002. Ouabain-binding protein(s) from human plasma.. Hypertension 40(2):220-8 PMID: 12154117
- 8. Man SM et al.. 2015. Regulation of inflammasome activation.. Immunol Rev 265(1):6-21 PMID: 25879280
