GO:0140081 glycosylated region protein binding: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0140081 (glycosylated region protein binding) is a molecular function defined as binding to a glycosylated region of a protein.
• Glycosylation is a common post-translational modification that creates binding epitopes for lectins, antibodies, and glycan receptors [2,6].
• Proteins such as TM9SF3, Sec24D, myoferlin, and surfactant protein D interact with glycosylated regions to mediate autophagy, ER exit, and immune recognition [1,5,7].
• The SARS-CoV-2 spike protein is heavily glycosylated, and its glycan shield modulates receptor binding and antibody recognition [2,4].
• Dysregulated glycosylated region protein binding contributes to viral immune evasion, coagulation disorders, and cancer progression [2,3,8].
• CRISPR knockout, point-mutation, and knock-in models enable functional dissection of glycosylated region binding in human disease [1,5].
Description
GO:0140081, glycosylated region protein binding, is a molecular function term in the Gene Ontology that describes the binding of a protein to a glycosylated region of another protein. Glycosylation is one of the most abundant post-translational modifications, and the resulting glycan structures can serve as recognition determinants for lectins, glycan receptors, and structural adaptors [2,6]. This binding activity is central to diverse biological processes, including protein quality control, intracellular trafficking, immune surveillance, and viral entry [1,5,7]. Researchers study this term to understand how glycan-protein interactions contribute to normal physiology and disease, and to identify therapeutic targets that disrupt pathological binding events [2,3,8].
glycosylated region protein binding At A Glance
| GO ID | GO:0140081 |
|---|---|
| GO term | glycosylated region protein binding |
| Ontology | molecular_function |
| Synonym | None |
| Major function | Binding to a glycosylated region of a protein |
| Definition source | QuickGO |
| Related processes | Protein trafficking, autophagy, immune recognition, viral entry |
| Example proteins | TM9SF3, Sec24D, myoferlin, surfactant protein D, SARS-CoV-2 spike |
What Is GO:0140081?
According to the Gene Ontology, GO:0140081 is defined as the molecular function of binding to a glycosylated region of a protein. In other words, it describes the selective interaction between a protein and a region of another protein that carries covalently attached glycan chains, such as N-linked or O-linked glycans. This function is distinct from binding to free glycans or to non-glycosylated protein regions, and it is often mediated by lectin domains or glycan-recognition motifs [2,6].
Why Is glycosylated region protein binding Important in Cell Biology?
Glycosylated region protein binding is important because it governs how cells recognize and respond to glycosylated proteins in health and disease [2,6]. This function is exploited by pathogens, such as SARS-CoV-2, whose glycosylated spike protein interacts with host receptors and antibodies [2,4]. It also plays a role in coagulation, where glycosylation of VWF A-domains affects clearance, and in immune regulation through surfactant protein D binding to SIRPα. Understanding this term helps researchers design glycosylation-targeted therapeutics and interpret glycan-mediated signaling [2,8].
• Mediates viral entry and immune evasion through glycosylated spike proteins [2,4].
• Regulates protein trafficking and ER exit via glycosylated Sec24D and myoferlin.
• Controls Golgi-selective autophagy through TM9SF3 binding to ATG8.
• Influences coagulation factor clearance via glycosylated VWF A-domains.
• Modulates innate immune recognition by surfactant protein D binding to SIRPα.
• Affects antibody effector functions through Fc glycosylation and glycan receptor binding.
• Contributes to anticoagulant protein S interactions with C4b-binding protein.
• Provides targets for glycoengineering and therapeutic antibody design [2,6].
• Enables CRISPR screening to identify glycosylation-dependent binding pathways [1,5].
• Links glycosylation to cancer, inflammation, and neurodegeneration [2,8].
Molecular Mechanism of glycosylated region protein binding
Glycan recognition and binding specificity
In simple terms: Proteins use specialized domains to recognize sugar chains attached to other proteins.
The binding of a protein to a glycosylated region typically involves lectin-like domains or glycan-binding pockets that recognize specific N-linked or O-linked glycans [2,6]. For example, surfactant protein D binds to the membrane-proximal domain of SIRPα in a glycan-dependent manner. The specificity of this interaction depends on the composition, branching, and presentation of the glycan chain.
Conformational dynamics of glycosylated proteins
In simple terms: Sugar chains can change the shape and flexibility of the protein they are attached to.
Molecular dynamics simulations of the fully glycosylated SARS-CoV-2 spike protein have shown that glycans modulate the conformational landscape of the protein, affecting receptor binding and antibody accessibility. This dynamic behavior is a key feature of glycosylated region protein binding, as the glycan shield can mask or expose binding epitopes.
Role in intracellular trafficking
In simple terms: Glycosylation acts like a zip code that helps proteins move to the right place inside the cell.
Site-specific glycosylation of Sec24D and myoferlin recruits ERGIC to ER exit sites for collagen trafficking. This demonstrates that glycosylated region protein binding is not only about recognition but also about spatial organization of membrane trafficking machinery.
Autophagy and Golgi homeostasis
In simple terms: A protein called TM9SF3 uses its glycosylated regions to help the cell recycle Golgi membranes.
TM9SF3 is a Golgi-resident ATG8-binding protein essential for Golgi-selective autophagy. Its interaction with ATG8 depends on glycosylated regions, linking glycosylation-dependent binding to autophagic degradation of Golgi membranes.
Immune recognition and antibody binding
In simple terms: Antibodies and immune receptors can bind to sugar-coated regions of proteins.
Hyper-glycosylated Fc regions of human IgG1 bind to glycan receptors, modulating immune effector functions. Similarly, surfactant protein D binds to SIRPα and SIRPβ, illustrating how glycosylated region binding contributes to innate immune regulation.
Coagulation and clearance
In simple terms: Sugar chains on blood clotting proteins affect how long they stay in circulation.
Site-directed PEGylation and novel N-linked glycosylation of VWF A-domains alter clearance, showing that glycosylated region protein binding influences hemostasis. Protein S binding to C4b-binding protein also depends on structural requirements that may involve glycosylation.
Key Genes Involved in GO:0140081 glycosylated region protein binding
The following genes and proteins are experimentally linked to glycosylated region protein binding or its downstream processes.
| Gene | Major Role | Research Relevance |
|---|---|---|
| TM9SF3 | Golgi-resident ATG8-binding protein | Essential for Golgi-selective autophagy |
| Sec24D | COPII component with site-specific glycosylation | Recruits ERGIC to ER exit sites for collagen trafficking |
| MYOF | Myoferlin, glycosylated membrane protein | Involved in ER exit site recruitment |
| SFTPD | Surfactant protein D, lectin | Binds SIRPα and SIRPβ via glycosylated regions |
| SIRPA | Signal regulatory protein α | Target of surfactant protein D binding |
| SIRPB1 | Signal regulatory protein β | Analogous binding region for surfactant protein D |
| VWF | Von Willebrand factor | A-domain glycosylation affects clearance |
| PROS1 | Protein S | Binds C4b-binding protein with structural requirements |
| C4BPA | C4b-binding protein alpha chain | Complement regulator interacting with protein S |
| SARS-CoV-2 S | Spike glycoprotein | Heavily glycosylated, binds ACE2 and antibodies [2,4] |
| ACE2 | Angiotensin-converting enzyme 2 | Receptor for SARS-CoV-2 spike |
| FCGR3A | Fc gamma receptor IIIa | Binds glycosylated Fc regions |
| FCGR2B | Fc gamma receptor IIb | Glycan receptor for IgG1 Fc |
| ATG8 | Autophagy-related protein | Binds TM9SF3 in Golgi autophagy |
| ERGIC | ER-Golgi intermediate compartment | Recruited by glycosylated Sec24D/myoferlin |
| COL1A1 | Collagen type I alpha 1 | Trafficking dependent on glycosylated Sec24D |
| LMAN1 | ERGIC-53 lectin | Glycan-binding cargo receptor in ER exit |
How Is glycosylated region protein binding Regulated?
The binding of proteins to glycosylated regions is regulated at multiple levels, including the expression and activity of glycosyltransferases that determine glycan structures, the availability of lectin-like receptors, and the conformational state of the glycosylated protein [2,6]. In the case of SARS-CoV-2, the glycan shield is dynamically regulated during viral assembly and can be modulated by host glycosylation machinery [2,4]. Intracellular trafficking pathways, such as COPII-mediated ER exit, are regulated by site-specific glycosylation of Sec24D and myoferlin. Autophagy-related glycosylated region binding by TM9SF3 is linked to Golgi homeostasis and ATG8 conjugation systems. Additionally, immune recognition through glycosylated Fc regions is regulated by antibody glycosylation patterns and Fc receptor expression.
glycosylated region protein binding and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| SARS-CoV-2 S | COVID-19, viral entry | Knock-in of glycosylation sites in spike; pseudovirus assays [2,4] |
| VWF | Von Willebrand disease, thrombosis | Point mutations at N-linked glycosylation sites |
| SFTPD | Inflammatory lung disease | Knockout of SFTPD in lung epithelial cells |
| FCGR3A | Cancer immunotherapy | Overexpression of glycosylated Fc in NK cells |
| TM9SF3 | Golgi homeostasis, autophagy | Knockout in HeLa cells for Golgi autophagy |
Viral infection and immune evasion
SARS-CoV-2 uses its heavily glycosylated spike protein to bind ACE2 and evade neutralizing antibodies [2,4]. The glycan shield of the spike protein is a major determinant of viral entry and antibody recognition, making glycosylated region protein binding a key target for antiviral research [2,4].
Coagulation disorders and thrombosis
Glycosylation of VWF A-domains affects clearance from circulation, and altered glycosylation can contribute to von Willebrand disease and thrombotic microangiopathies. Protein S binding to C4b-binding protein is also influenced by structural features that may involve glycosylation, linking this function to anticoagulant pathways.
Cancer and immune regulation
Hyper-glycosylated Fc regions of IgG1 bind to glycan receptors, modulating antibody effector functions in cancer immunotherapy. Aberrant glycosylation of tumor-associated proteins can create novel binding epitopes for lectins, promoting tumor progression and immune evasion.
Inflammatory and autoimmune diseases
Surfactant protein D binding to SIRPα and SIRPβ via glycosylated regions contributes to innate immune regulation and inflammation. Dysregulation of this interaction may be involved in autoimmune and inflammatory lung diseases.
From glycosylated region protein binding-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does glycosylation of Sec24D regulate ER exit? | Point mutation of glycosylation sites in Sec24D |
| Is TM9SF3 required for Golgi autophagy? | Knockout of TM9SF3 in mammalian cells |
| How does spike glycosylation affect antibody binding? | Knock-in of glycan sites in SARS-CoV-2 spike [2,4] |
| Does Fc glycosylation alter glycan receptor binding? | Overexpression of hyper-glycosylated IgG1 Fc |
| Does VWF A-domain glycosylation affect clearance? | Site-directed mutagenesis of N-linked sites |
| Does surfactant protein D bind SIRPα in vivo? | Knockout of SIRPα in macrophages |
How to Study the glycosylated region protein binding Process
| Method | What It Measures | Typical Application |
|---|---|---|
| ELISA | Binding affinity to glycosylated proteins | Screening glycan receptor interactions |
| Surface plasmon resonance | Kinetics of glycosylated region binding | Quantifying affinity and specificity |
| Mass spectrometry | Glycan composition and site occupancy | Mapping glycosylation sites [2,5] |
| Molecular dynamics | Conformational changes due to glycans | Simulating spike protein dynamics |
| CRISPR knockout screen | Genes required for binding | Identifying glycosylation pathway components |
| Site-directed mutagenesis | Effect of removing glycosylation sites | Validating glycosylated region function |
| Flow cytometry | Cell surface binding of glycosylated ligands | Immune receptor binding assays |
| Glycan array | Specificity for glycan structures | Profiling lectin binding |
Glycan-binding assays
Methods such as ELISA, surface plasmon resonance, and glycan arrays are used to detect and quantify binding of proteins to glycosylated regions [6,7]. These assays can be adapted to screen for inhibitors or to compare wild-type and glycosylation-deficient mutants.
Mass spectrometry and glycomics
Mass spectrometry-based glycomics and glycoproteomics identify site-specific glycosylation and quantify glycan occupancy on target proteins [2,5]. This is essential for mapping glycosylated regions involved in protein-protein interactions.
Molecular dynamics simulations
All-atom and coarse-grained simulations of fully glycosylated proteins, such as the SARS-CoV-2 spike, reveal how glycans modulate conformational dynamics and binding interfaces. These computational approaches complement experimental binding studies.
CRISPR screening and functional genomics
Genome-wide CRISPR knockout screens can identify genes required for glycosylated region protein binding, such as glycosyltransferases and lectin receptors [1,5]. Follow-up validation with targeted knockouts or point mutations confirms causality.
How CRISPR Can Be Used to Study GO:0140081 glycosylated region protein binding
Knockout
CRISPR knockout of genes encoding glycosyltransferases or glycan-binding proteins can abolish glycosylated region protein binding, as shown for TM9SF3 in Golgi autophagy. Knockout models are used to test the requirement of specific glycosylation events in cellular processes [1,5].
Point Mutation
Point mutations that remove individual glycosylation sites (e.g., N to Q) allow precise dissection of which glycan is required for binding [3,5]. This approach has been used to study VWF A-domain clearance and Sec24D function [3,5].
Knock-in
Knock-in of glycosylation sites or glycan-binding domains can confer new binding properties, as demonstrated by engineering glycosylation sites into the SARS-CoV-2 spike protein [2,4]. Knock-in models are valuable for studying gain-of-function glycosylation effects.
Overexpression
Overexpression of hyper-glycosylated proteins, such as IgG1 Fc, enables the study of glycan receptor binding and downstream signaling. Overexpression systems are also used to produce glycosylated proteins for structural and biophysical studies [4,6].
How EDITGENE Supports glycosylated region protein binding Research
Researchers studying glycosylated region protein binding-related genes often need to determine whether a candidate gene is causally involved in glycan-dependent interactions, protein trafficking, or disease progression. EDITGENE provides comprehensive CRISPR-based services to generate precisely engineered cell models for functional validation.
Contact EDITGENE today to design your custom CRISPR model for glycosylated region protein binding research.
Frequently Asked Questions About glycosylated region protein binding
What is glycosylated region protein binding?
It is a molecular function (GO:0140081) defined as binding to a glycosylated region of a protein, often mediated by lectin-like domains [2,6].
What genes are involved in glycosylated region protein binding?
Genes include TM9SF3, Sec24D, MYOF, SFTPD, SIRPA, VWF, PROS1, and SARS-CoV-2 S, among others [1,3,5,7].
How does glycosylation affect protein binding?
Glycans can create or mask binding epitopes, alter protein conformation, and modulate interactions with lectins and antibodies [2,4].
What is the role of glycosylated region protein binding in viral infection?
It enables viruses like SARS-CoV-2 to bind host receptors and evade antibodies through a glycan shield [2,4].
Which diseases are linked to glycosylated region protein binding?
COVID-19, von Willebrand disease, cancer, and inflammatory lung diseases are associated with this function [2,3,6,7].
How can CRISPR be used to study glycosylated region protein binding?
CRISPR knockout, point mutation, and knock-in models can remove or add glycosylation sites to test their function [1,3,5].
What methods detect glycosylated region protein binding?
ELISA, surface plasmon resonance, mass spectrometry, and glycan arrays are commonly used [2,6,7].
What is the difference between glycosylated region protein binding and lectin binding?
Glycosylated region protein binding specifically refers to binding a glycosylated region of a protein, while lectin binding can involve free glycans [2,6].
Can glycosylated region protein binding be targeted therapeutically?
Yes, glycoengineering and glycan-targeted antibodies are being developed for viral infections and cancer [2,6].
What cell models are available for studying glycosylated region protein binding?
Knockout, point mutation, knock-in, and overexpression cell lines can be generated using CRISPR [1,3,5].
Conclusion
GO:0140081, glycosylated region protein binding, is a fundamental molecular function that underlies diverse biological processes, from viral entry to immune regulation and protein trafficking [2,6]. Its dysregulation is implicated in COVID-19, coagulation disorders, cancer, and inflammatory diseases [2,3,6,7]. Advances in CRISPR-based models and glycomics are accelerating the discovery of glycosylation-dependent interactions and therapeutic targets [1,5]. Continued research into this term will illuminate how glycan-protein interactions shape human health and disease.
References
- 1. Yang J et al.. 2025. TM9SF3 is a Golgi-resident ATG8-binding protein essential for Golgi-selective autophagy.. Dev Cell 60(21):2862-2879.e8 PMID: 40609542
- 2. Chawla H et al.. 2022. Principles of SARS-CoV-2 glycosylation.. Curr Opin Struct Biol 75:102402 PMID: 35717706
- 3. Fazavana J et al.. 2020. Investigating the clearance of VWF A-domains using site-directed PEGylation and novel N-linked glycosylation.. J Thromb Haemost 18(6):1278-1290 PMID: 32108991
- 4. Choi YK et al.. 2021. Structure, Dynamics, Receptor Binding, and Antibody Binding of the Fully Glycosylated Full-Length SARS-CoV-2 Spike Protein in a Viral Membrane.. J Chem Theory Comput 17(4):2479-2487 PMID: 33689337
- 5. Hirata T et al.. 2026. Site-specific glycosylation of Sec24D and myoferlin recruit ERGIC to ER exit sites for collagen trafficking.. Nat Commun 17(1) PMID: 42129160
- 6. Blundell P et al.. 2019. A Method to Detect the Binding of Hyper-Glycosylated Fragment Crystallizable (Fc) Region of Human IgG1 to Glycan Receptors.. Methods Mol Biol 1904:417-421 PMID: 30539483
- 7. Fournier B et al.. 2012. Surfactant protein D (Sp-D) binds to membrane-proximal domain (D3) of signal regulatory protein α (SIRPα), a site distant from binding domain of CD47, while also binding to analogous region on signal regulatory protein β (SIRPβ).. J Biol Chem 287(23):19386-98 PMID: 22511785
- 8. Giri TK et al.. 2002. Structural requirements of anticoagulant protein S for its binding to the complement regulator C4b-binding protein.. J Biol Chem 277(17):15099-106 PMID: 11847209
