GO:0071742 IgE immunoglobulin complex: Components, Assembly and Research Methods, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0071742 IgE immunoglobulin complex is a cellular component defined as a protein complex of two identical IgE heavy chains and two identical light chains held by disulfide bonds.
• IgE complexes can be membrane-embedded on B cells or secreted into blood, lymph, mucosal areas, and other tissues.
• The IgE heavy chain constant region determines isotype and mediates binding to Fc receptors such as FcεRI and FcεRII/CD23.
• IgE complex shape and epitope proximity influence immune complex formation and effector cell activation capacity.
• IgE glycans modulate anti-IgE IgG autoantibodies and IgE serum clearance via Fc receptors.
• CRISPR-based knockout, point mutation, knock-in, and overexpression models enable causal dissection of IgE complex biology.
Description
The IgE immunoglobulin complex (GO:0071742) is a cellular component consisting of two identical immunoglobulin heavy chains of the IgE isotype and two identical immunoglobulin light chains, held together by disulfide bonds. This complex may be embedded in the plasma membrane of B cells or secreted into the extracellular space, including mucosal areas, other tissues, blood, and lymph. As the least abundant immunoglobulin isotype in serum, IgE plays a central role in type I hypersensitivity and anti-parasite immunity. Understanding its structure, assembly, and regulation is therefore critical for allergy, asthma, and immunology research. The IgE complex is not merely a passive antibody; its shape, glycosylation, and epitope proximity determine how it engages Fc receptors and activates effector cells. These features make GO:0071742 a key entity for studies of allergic inflammation, autoimmunity, and therapeutic antibody design.
IgE immunoglobulin complex At A Glance
| GO ID | GO:0071742 |
|---|---|
| GO term | IgE immunoglobulin complex |
| Ontology | cellular_component |
| Synonym | None |
| Major function | Antigen recognition and effector cell activation via Fc receptors |
| Complex composition | Two identical IgE heavy chains and two identical light chains |
| Assembly | Heavy and light chains held together by disulfide bonds |
| Localization | Plasma membrane or extracellular space, mucosal areas, tissues, blood, lymph |
| Receptor interactions | FcεRI, FcεRII/CD23, and anti-IgE autoantibodies |
What Is GO:0071742?
GO:0071742 describes a protein complex composed of two identical immunoglobulin heavy chains of the IgE isotype and two identical immunoglobulin light chains, held together by disulfide bonds. The complex can exist as a membrane-bound form on the surface of B cells or as a secreted form in the extracellular space, mucosal areas, other tissues, blood, or lymph.
Why Is IgE immunoglobulin complex Important in Cell Biology?
The IgE immunoglobulin complex is central to allergic diseases, asthma, and anti-parasite immunity, and it is the target of anti-IgE biologics such as omalizumab. Its structural and glycosylation features influence immune complex shape, effector cell activation, and serum clearance, making it a critical node for therapeutic intervention.
• IgE complexes mediate type I hypersensitivity and anaphylaxis.
• IgE is the least abundant serum immunoglobulin but has potent effector functions.
• IgE complex shape and epitope proximity determine effector cell activation capacity.
• IgE glycans promote anti-IgE IgG autoantibodies that facilitate IgE serum clearance.
• Anti-IgE biologics target IgE complexes in allergic asthma and chronic urticaria.
• Hyper-IgM syndromes can inform class-switch recombination defects relevant to IgE production.
• Recombinant plant-derived human IgE glycoproteomics enables glycan analysis.
• IgE complex studies inform vaccine and allergen immunotherapy design.
• Membrane IgE on B cells is a marker of class-switched B cells.
• IgE complex research intersects with autoimmunity and immunodeficiency.
What Happens During IgE immunoglobulin complex?
B cell class switching to IgE
In simple terms: B cells change the type of antibody they make to IgE.
Class switch recombination in B cells replaces the heavy chain constant region with the IgE isotype, allowing production of IgE heavy chains that assemble into the IgE immunoglobulin complex. Defects in class switching can lead to hyper-IgM syndromes with altered IgE levels.
Assembly of heavy and light chains
In simple terms: Two heavy and two light chains join to form the IgE antibody.
The IgE immunoglobulin complex is assembled from two identical IgE heavy chains and two identical light chains, held together by disulfide bonds. This assembly occurs in the endoplasmic reticulum and Golgi before secretion or membrane insertion.
Membrane versus secreted IgE
In simple terms: IgE can stay on the B cell surface or be released into the body.
The IgE complex may be embedded in the plasma membrane via a transmembrane domain or secreted into the extracellular space, mucosal areas, other tissues, blood, or lymph. Membrane IgE marks class-switched B cells, while secreted IgE circulates and binds Fc receptors on effector cells.
Fc receptor engagement and effector activation
In simple terms: IgE binds to receptors on immune cells to trigger allergic responses.
Secreted IgE complexes bind FcεRI on mast cells and basophils, and FcεRII/CD23 on other cells, leading to effector cell activation. The shape of IgE immune complexes and epitope proximity influence activation capacity.
Glycosylation and serum clearance
In simple terms: Sugar modifications on IgE affect how long it stays in the blood.
IgE glycans promote anti-IgE IgG autoantibodies that facilitate IgE serum clearance via Fc receptors. Recombinant plant-derived human IgE glycoproteomics has been used to map IgE glycosylation.
Key Genes Involved in GO:0071742 IgE immunoglobulin complex
The following genes and proteins are central to the structure, assembly, regulation, and function of the IgE immunoglobulin complex.
| Gene | Major Role | Research Relevance |
|---|---|---|
| IGHE | Encodes the IgE heavy chain constant region | Defines isotype and Fc receptor binding |
| IGKC | Encodes immunoglobulin kappa light chain | Forms light chains of IgE complex |
| IGLC1 | Encodes immunoglobulin lambda light chain | Alternative light chain for IgE complex |
| FCER1A | High-affinity IgE receptor alpha chain | Mediates mast cell activation |
| MS4A2 | FcεRI beta chain | Amplifies IgE receptor signaling |
| FCER2 | Low-affinity IgE receptor CD23 | Regulates IgE production and clearance |
| AICDA | Activation-induced cytidine deaminase | Required for class switch to IgE |
| CD40LG | CD40 ligand | Drives class switching in B cells |
| IL4 | Interleukin-4 | Promotes IgE class switching |
| IL13 | Interleukin-13 | Promotes IgE production |
| STAT6 | Signal transducer and activator of transcription 6 | Mediates IL-4/IL-13 signaling for IgE |
| GATA2 | Transcription factor | Regulates IgE class switching |
| XBP1 | X-box binding protein 1 | Supports plasma cell secretion of IgE |
| PRDM1 | BLIMP1 | Regulates plasma cell differentiation for IgE |
| IGHM | IgM heavy chain | Precursor isotype before class switching |
| IGHD | IgD heavy chain | Precursor isotype before class switching |
| IGHG1 | IgG1 heavy chain | Alternative isotype after class switching |
How Is IgE immunoglobulin complex Regulated?
IgE immunoglobulin complex levels are regulated at multiple levels. Class switch recombination to IgE is driven by IL-4/IL-13 signaling through STAT6 and CD40/CD40L interactions. Glycosylation of IgE modulates anti-IgE IgG autoantibodies and serum clearance via Fc receptors. The shape and epitope proximity of IgE immune complexes further regulate effector cell activation capacity.
IgE immunoglobulin complex and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| IGHE | Allergic asthma | Knockout and knock-in IgE heavy chain models |
| FCER1A | Chronic urticaria | Point mutation of FcεRI alpha chain |
| AICDA | Hyper-IgM syndrome | Knockout of AICDA in B cells |
| CD40LG | Hyper-IgM syndrome | Knockout of CD40LG in T cells |
| FCER2 | IgE regulation | Overexpression of CD23 |
Allergic asthma and type I hypersensitivity
IgE complexes bind FcεRI on mast cells and basophils, triggering histamine release and allergic inflammation. Anaphylactic or tolerant outcomes depend on IgE complex characteristics and receptor engagement.
Hyper-IgM syndromes
Defects in class switch recombination, such as CD40LG or AICDA mutations, can alter IgE production and lead to hyper-IgM phenotypes.
Autoimmunity against IgE
IgE glycans promote anti-IgE IgG autoantibodies that facilitate IgE serum clearance via Fc receptors, linking IgE glycosylation to autoimmune regulation.
From IgE immunoglobulin complex-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does IgE heavy chain drive allergic inflammation? | IGHE knockout mouse |
| How does FcεRI alpha chain mutation affect signaling? | Point mutation knock-in |
| Can tagged IgE track membrane versus secreted forms? | Tagged knock-in of IGHE |
| Does CD23 overexpression alter IgE clearance? | Overexpression of FCER2 |
| What is the role of AICDA in IgE class switching? | AICDA knockout B cells |
| How do IgE glycans affect autoantibody formation? | Glycosylation mutant knock-in |
How to Study the IgE immunoglobulin complex Process
| Method | What It Measures | Typical Application |
|---|---|---|
| ELISA | IgE concentration | Serum IgE quantification |
| Flow cytometry | Membrane IgE and FcεRI binding | B cell and mast cell analysis |
| Glycoproteomics | IgE glycan structures | Glycosylation studies |
| Surface plasmon resonance | IgE-receptor affinity | Binding kinetics |
| Crystallography | IgE complex structure | Epitope mapping |
| CRISPR knockout | Gene function | IgE class switching |
| RNA-seq | Transcriptional changes | B cell differentiation |
ELISA and Immunoassays
ELISA quantifies total and antigen-specific IgE complexes in serum and supernatants, enabling studies of class switching and secretion.
Flow cytometry
Flow cytometry detects membrane IgE on B cells and FcεRI-bound IgE on mast cells and basophils, allowing assessment of complex assembly and receptor engagement.
Glycoproteomics
Recombinant plant-derived human IgE glycoproteomics maps IgE glycosylation sites and glycan structures that influence clearance and autoantibody formation.
Structural biology
Crystal structures and models of IgE and its receptors reveal how complex shape and epitope proximity determine effector cell activation.
How CRISPR Can Be Used to Study GO:0071742 IgE immunoglobulin complex
Knockout
CRISPR knockout of IGHE, FCER1A, or AICDA can abolish IgE complex formation or class switching, providing causal evidence for gene function in allergy models.
Point Mutation
Point mutations in FCER1A or IGHE can dissect residues required for Fc receptor binding and effector cell activation.
Knock-in
Knock-in of tagged IgE heavy chain enables tracking of membrane versus secreted IgE complexes in vivo.
Overexpression
Overexpression of FCER2 or IL4 can drive IgE production and receptor occupancy, modeling allergic sensitization.
How EDITGENE Supports IgE immunoglobulin complex Research
Researchers studying IgE immunoglobulin complex-related genes often need to determine whether a candidate gene is causally involved in class switching, complex assembly, or effector cell activation. EDITGENE provides CRISPR-based cell models and screening services to accelerate this causal dissection.
Contact EDITGENE today to design your custom CRISPR model for IgE immunoglobulin complex research.
Frequently Asked Questions About IgE immunoglobulin complex
What is GO:0071742 IgE immunoglobulin complex?
It is a protein complex of two identical IgE heavy chains and two identical light chains held by disulfide bonds, found on B cell membranes or secreted into blood, lymph, and tissues.
What genes are involved in IgE immunoglobulin complex?
Key genes include IGHE, IGKC, IGLC1, FCER1A, MS4A2, FCER2, AICDA, CD40LG, IL4, IL13, and STAT6.
Where is the IgE immunoglobulin complex located?
It can be embedded in the plasma membrane or present in the extracellular space, mucosal areas, other tissues, blood, or lymph.
How is the IgE immunoglobulin complex assembled?
Two IgE heavy chains and two light chains assemble with disulfide bonds in the endoplasmic reticulum and Golgi.
What is the role of IgE complexes in allergy?
IgE complexes bind FcεRI on mast cells and basophils, triggering allergic inflammation and anaphylaxis.
How do IgE glycans affect serum clearance?
IgE glycans promote anti-IgE IgG autoantibodies that facilitate IgE serum clearance via Fc receptors.
What diseases are linked to IgE immunoglobulin complex?
Allergic asthma, chronic urticaria, hyper-IgM syndromes, and autoimmune responses to IgE.
How can CRISPR be used to study IgE complexes?
CRISPR knockout, point mutation, knock-in, and overexpression models can test gene function in IgE class switching and receptor binding.
What methods study IgE immunoglobulin complexes?
ELISA, flow cytometry, glycoproteomics, surface plasmon resonance, and crystallography.
What is the difference between membrane and secreted IgE?
Membrane IgE is embedded in the B cell plasma membrane, while secreted IgE circulates in blood and lymph and binds Fc receptors on effector cells.
Conclusion
The IgE immunoglobulin complex (GO:0071742) is a central cellular component in allergic immunity, defined by two IgE heavy chains and two light chains held by disulfide bonds. Its assembly, glycosylation, and receptor interactions determine effector cell activation and serum clearance. CRISPR-based models and EDITGENE services provide powerful tools to dissect the causal roles of IgE-related genes in health and disease.
References
- 1. Schroeder HW Jr et al.. 2010. Structure and function of immunoglobulins.. J Allergy Clin Immunol 125(2 Suppl 2):S41-52 PMID: 20176268
- 3. McDonnell JM et al.. 2023. IgE, IgE Receptors and Anti-IgE Biologics: Protein Structures and Mechanisms of Action.. Annu Rev Immunol 41:255-275 PMID: 36737596
- 4. Kawakami T et al.. 2020. Anaphylactic or tolerant outcomes with IgE.. J Allergy Clin Immunol 145(1):114-115 PMID: 31672608
- 5. de la Morena MT. 2016. Clinical Phenotypes of Hyper-IgM Syndromes.. J Allergy Clin Immunol Pract 4(6):1023-1036 PMID: 27836054
- 6. Gieras A et al.. 2016. IgE epitope proximity determines immune complex shape and effector cell activation capacity.. J Allergy Clin Immunol 137(5):1557-65 PMID: 26684291
- 7. Plattner K et al.. 2022. IgE glycans promote anti-IgE IgG autoantibodies that facilitate IgE serum clearance via Fc Receptors.. Front Immunol 13:1069100 PMID: 36544773
- 8. Montero-Morales L et al.. 2017. Recombinant plant-derived human IgE glycoproteomics.. J Proteomics 161:81-87 PMID: 28400175
