GO:0044871 negative regulation by host of viral glycoprotein metabolic process: Host Restriction Pathway, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0044871 describes a host-driven biological process that stops, prevents, or reduces the frequency, rate, or extent of viral glycoprotein metabolic process.
• Host cells use post-translational modifications, ubiquitin ligases, and interferon-stimulated effectors to restrict viral glycoprotein synthesis and maturation.
• Key host restriction factors include MARCH2, MARCH3, DDX60, SLC35B2, and CD44c, which target viral glycoproteins or their biosynthetic machinery.
• Disruption of this host defense pathway can enhance viral replication, as shown for Zika virus, Crimean-Congo haemorrhagic fever virus, and Akabane virus.
• CRISPR knockout, point-mutation, knock-in, and overexpression models are essential to causally link host genes to viral glycoprotein restriction.
• Understanding GO:0044871 informs antiviral drug discovery, vaccine design, and host-directed therapies against enveloped viruses.
Description
The Gene Ontology term GO:0044871, negative regulation by host of viral glycoprotein metabolic process, defines a host organism's capacity to stop, prevent, or reduce the frequency, rate, or extent of viral glycoprotein metabolic process. Viral glycoproteins are essential structural components that mediate viral entry, assembly, and egress, making their metabolic pathways prime targets for host restriction mechanisms. This GO term captures a critical arm of intrinsic and innate antiviral immunity that operates by interfering with the synthesis, folding, modification, or trafficking of viral glycoproteins. Researchers studying enveloped viruses such as Zika virus, Crimean-Congo haemorrhagic fever virus, and Akabane virus increasingly recognize that host factors can dominantly restrict viral glycoprotein production, thereby limiting infection. Understanding GO:0044871 is therefore central to dissecting virus-host interactions and to developing host-directed antiviral strategies.
negative regulation by host of viral glycoprotein metabolic process At A Glance
| GO ID | GO:0044871 |
|---|---|
| GO term | negative regulation by host of viral glycoprotein metabolic process |
| Ontology | biological_process |
| Synonym | None |
| Definition | A process in which a host organism stops, prevents or reduces the frequency, rate or extent of viral glycoprotein metabolic process. |
| Major function | Host-mediated restriction of viral glycoprotein synthesis, modification, and maturation |
| Related processes | Post-translational modification, ubiquitination, interferon signaling, viral assembly |
| Taxonomic scope | Host organisms across metazoa, including mammals and fish |
| Research relevance | Antiviral immunity, host-pathogen interactions, therapeutic target discovery |
What Is GO:0044871?
GO:0044871 is a biological process term describing how a host organism negatively regulates the metabolic process of viral glycoproteins. In practical terms, it encompasses any host-driven mechanism that reduces the production, modification, or maturation of viral glycoproteins, thereby impairing viral replication and spread.
Why Is negative regulation by host of viral glycoprotein metabolic process Important in Cell Biology?
GO:0044871 is important because viral glycoproteins are indispensable for the infectivity of enveloped viruses, and host mechanisms that negatively regulate their metabolic process can determine the outcome of infection. Many viruses have evolved countermeasures against these host restrictions, underscoring an evolutionary arms race that shapes viral pathogenesis and host range. Defining the host genes and pathways that execute this negative regulation provides a rational basis for host-directed antivirals that are less prone to resistance than drugs targeting viral proteins directly.
• Viral glycoproteins are required for entry, assembly, and egress of enveloped viruses, so their restriction directly limits viral spread.
• Host ubiquitin ligases such as MARCH2 and MARCH3 target viral receptors and glycoproteins to limit infection.
• Post-translational modifications of host restriction factors regulate their antiviral activity against viral glycoprotein metabolism.
• DDX60 is hijacked by Crimean-Congo haemorrhagic fever virus, but its normal function can restrict viral replication.
• SLC35B2-mediated sulfation is required for EV71 infection, revealing host metabolic dependencies that can be targeted.
• Piscine CD44c negatively regulates viral and bacterial infection, showing evolutionary conservation of host restriction.
• HIV-1 infection reprogrammes CD4+ T cells, highlighting how viruses manipulate host gene expression to evade restriction.
• Host protein interactome profiling of Akabane virus glycoprotein Gc identifies mitochondrial genes that regulate viral replication.
• Understanding GO:0044871 can guide development of broad-spectrum antivirals and vaccine adjuvants.
• CRISPR-based screens can systematically identify host genes that negatively regulate viral glycoprotein metabolic processes.
What Happens During negative regulation by host of viral glycoprotein metabolic process?
Recognition of viral glycoproteins by host restriction factors
In simple terms: The host cell detects viral glycoproteins as foreign and sends proteins to stop them.
Host cells express pattern recognition receptors and interferon-stimulated genes that recognize viral glycoproteins or their biosynthetic intermediates. For example, the ubiquitin ligases MARCH2 and MARCH3 target the Zika virus receptor TIM-1 for degradation, thereby limiting viral entry and subsequent glycoprotein production. Similarly, host protein interactome profiling of Akabane virus glycoprotein Gc revealed mitochondrial proteins that regulate viral replication. This recognition step is a prerequisite for the negative regulation defined by GO:0044871.
Post-translational modification of host restriction factors
In simple terms: Host proteins that fight viruses get chemical tags that switch them on or off.
Post-translational modifications such as ubiquitination, phosphorylation, and SUMOylation regulate the stability and activity of host restriction factors. These modifications can either enhance or dampen the negative regulation of viral glycoprotein metabolic processes. For instance, MARCH2 and MARCH3 are membrane-associated ubiquitin ligases whose activity depends on their catalytic RING domains. The dynamic nature of these modifications allows the host to rapidly respond to viral infection.
Interference with viral glycoprotein synthesis and folding
In simple terms: The host blocks the assembly line that makes viral glycoproteins.
Host factors can inhibit the synthesis, folding, or glycosylation of viral glycoproteins. SLC35B2 acts in a dual role in host sulfation required for EV71 infection, indicating that host metabolic pathways can be co-opted or restricted to control viral glycoprotein maturation. In fish, CD44c negatively regulates viral and bacterial infection, suggesting conserved mechanisms that interfere with glycoprotein-dependent viral processes. These events reduce the availability of functional viral glycoproteins for virion assembly.
Degradation and trafficking blockade of viral glycoproteins
In simple terms: The host destroys or misroutes viral glycoproteins so they cannot reach the virus assembly site.
Ubiquitin ligases such as MARCH2 and MARCH3 mediate the degradation of viral receptors and possibly glycoproteins, limiting their availability for viral assembly. DDX60, an RNA helicase, is hijacked by Crimean-Congo haemorrhagic fever virus to promote replication, but its normal function can also restrict viral processes through G-quadruplex unwinding. Host cells may also block intracellular trafficking of viral glycoproteins to the plasma membrane, a key step in enveloped virus egress.
Integration with innate immune signaling
In simple terms: The antiviral alarm system amplifies the block on viral glycoproteins.
Interferon signaling induces the expression of many host restriction factors that collectively negative regulate viral glycoprotein metabolic processes. HIV-1 infection converts CD4+ T cells to HLA class II-restricted CD8+ T cells, illustrating how viruses can remodel host cell identity and potentially evade restriction. The interplay between innate immune signaling and glycoprotein restriction determines the efficiency of GO:0044871.
Key Genes Involved in GO:0044871 negative regulation by host of viral glycoprotein metabolic process
The following host genes and proteins have been experimentally linked to the negative regulation of viral glycoprotein metabolic processes or related antiviral restriction pathways.
| Gene | Major Role | Research Relevance |
|---|---|---|
| MARCH2 | Membrane-associated ubiquitin ligase targeting TIM-1 to limit Zika virus infection | Restricts viral entry and glycoprotein-dependent replication |
| MARCH3 | Membrane-associated ubiquitin ligase targeting TIM-1 to limit Zika virus infection | Restricts viral entry and glycoprotein-dependent replication |
| DDX60 | RNA helicase with G-quadruplex unwinding activity; hijacked by CCHFV but can restrict viral replication | Host factor in viral restriction and counter-restriction |
| SLC35B2 | Host sulfation factor required for EV71 infection | Dual role in host metabolism and viral glycoprotein processing |
| CD44c | Piscine negative regulator of viral and bacterial infection | Evolutionarily conserved host restriction |
| TIM-1 | Zika virus receptor targeted by MARCH2/MARCH3 for degradation | Entry receptor and restriction target |
| Akabane virus Gc | Viral glycoprotein interacting with mitochondrial host proteins | Model for host interactome profiling |
| Mitochondrial genes | Regulate Akabane virus replication | Host metabolic control of viral glycoprotein processes |
| HLA class II | Restriction element in HIV-1-infected CD4+ T cells converted to CD8+ T cells | Host immune remodeling during infection |
| Interferon-stimulated genes | Broad-spectrum restriction of viral glycoprotein metabolism | Core of GO:0044871 |
| Ubiquitin ligases | Post-translational modification of host and viral proteins | Regulation of restriction factor stability |
| SUMOylation machinery | Modifies host restriction factors | Regulation of antiviral activity |
| Phosphorylation kinases | Modify host restriction factors | Regulation of antiviral activity |
| G-quadruplex structures | Targets of DDX60 unwinding | Viral RNA metabolism and restriction |
| Sulfation pathway enzymes | Required for EV71 infection | Host metabolic dependency |
| CD44 family | Cell adhesion and negative regulation of infection | Conserved host restriction |
| Mesothelin | CAR-NKT target in triple-negative breast cancer | Example of engineered cell therapy, not directly GO:0044871 |
How Is negative regulation by host of viral glycoprotein metabolic process Regulated?
The negative regulation by host of viral glycoprotein metabolic process is controlled by post-translational modifications of host restriction factors, including ubiquitination, phosphorylation, and SUMOylation. Interferon signaling transcriptionally upregulates many restriction factors, while viral proteins can antagonize these effectors. The stability and activity of ubiquitin ligases such as MARCH2 and MARCH3 are tightly regulated, and their catalytic activity is required for targeting TIM-1. Additionally, host metabolic pathways such as sulfation can modulate viral glycoprotein processing, as shown for SLC35B2 in EV71 infection. These layers of regulation ensure a dynamic balance between host restriction and viral evasion.
negative regulation by host of viral glycoprotein metabolic process and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| MARCH2 | Zika virus infection | Knockout of MARCH2 in human cells followed by Zika virus challenge |
| MARCH3 | Zika virus infection | Knockout of MARCH3 in human cells followed by Zika virus challenge |
| DDX60 | Crimean-Congo haemorrhagic fever virus | DDX60 knockout or overexpression in CCHFV infection models |
| SLC35B2 | EV71 infection | SLC35B2 knockout or point mutation in EV71-susceptible cells |
| CD44c | Viral and bacterial infection in fish | CD44c knockout in piscine cell lines |
Zika virus infection and neuropathology
Zika virus infection can cause congenital Zika syndrome and Guillain-Barré syndrome. Host ubiquitin ligases MARCH2 and MARCH3 target TIM-1 for degradation, limiting Zika virus infection and thereby restricting viral glycoprotein metabolic processes. Loss of these ligases may enhance viral replication and disease severity.
Crimean-Congo haemorrhagic fever virus (CCHFV)
CCHFV is a highly pathogenic bunyavirus. Host DDX60 is hijacked by CCHFV to promote replication via G-quadruplex unwinding, but its normal function can also restrict viral processes. Understanding how DDX60 balances restriction and proviral activity is critical for therapeutic development.
Akabane virus and veterinary disease
Akabane virus causes congenital abnormalities in livestock. Host protein interactome profiling of the viral glycoprotein Gc identified mitochondrial genes that regulate viral replication, highlighting host targets for intervention. This model illustrates how host factors can negatively regulate viral glycoprotein metabolism.
Enterovirus 71 (EV71) and hand, foot, and mouth disease
EV71 infection requires host sulfation mediated by SLC35B2. The dual role of SLC35B2 in host sulfation and EV71 infection reveals a metabolic dependency that can be targeted to restrict viral glycoprotein processing. Modulating this pathway may reduce EV71 replication and disease.
From negative regulation by host of viral glycoprotein metabolic process-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does MARCH2 restrict Zika virus glycoprotein metabolism? | MARCH2 knockout human cells with Zika virus infection |
| Does MARCH3 ubiquitinate TIM-1 to limit Zika virus? | MARCH3 point-mutation (catalytic dead) knock-in cells |
| Does DDX60 restrict CCHFV replication? | DDX60 knockout or overexpression in CCHFV infection |
| Does SLC35B2 sulfation affect EV71 glycoprotein processing? | SLC35B2 knockout or point-mutation cells |
| Does CD44c negatively regulate viral infection? | CD44c knockout fish cell lines |
| Can host mitochondrial genes regulate Akabane virus replication? | Mitochondrial gene knockout or overexpression with Akabane virus Gc interactome |
How to Study the negative regulation by host of viral glycoprotein metabolic process Process
| Method | What It Measures | Typical Application |
|---|---|---|
| CRISPR knockout screen | Host gene requirement for viral glycoprotein restriction | Identify novel restriction factors |
| Proteomics (AP-MS) | Host protein interactions with viral glycoproteins | Map interactome of Akabane virus Gc |
| RNA-seq | Transcriptional changes during infection | Discover interferon-stimulated genes |
| Phosphoproteomics | Phosphorylation of host restriction factors | Study post-translational regulation |
| Ubiquitinome profiling | Ubiquitination targets | Identify substrates of MARCH2/MARCH3 |
| G-quadruplex unwinding assay | DDX60 helicase activity | Study CCHFV restriction |
| Sulfation assay | SLC35B2-mediated sulfation | EV71 infection dependency |
| Flow cytometry | Viral glycoprotein surface expression | Quantify restriction of glycoprotein trafficking |
CRISPR knockout screens
Genome-wide CRISPR knockout screens can identify host genes whose loss enhances or reduces viral glycoprotein metabolic processes. Such screens have revealed ubiquitin ligases and interferon-stimulated genes as key regulators. Validating hits with individual knockouts confirms causality.
Proteomics and interactome profiling
Host protein interactome profiling of viral glycoproteins, such as Akabane virus Gc, identifies host proteins that regulate viral replication. Affinity purification-mass spectrometry and proximity labeling are commonly used. These methods reveal physical connections between host factors and viral glycoproteins.
Transcriptomics and RNA-seq
RNA-seq measures changes in host gene expression upon viral infection or restriction factor perturbation. It can reveal interferon-stimulated genes and pathways that negatively regulate viral glycoprotein metabolism. Single-cell RNA-seq can dissect cell-type-specific responses.
Post-translational modification analysis
Mass spectrometry-based proteomics can map ubiquitination, phosphorylation, and SUMOylation sites on host restriction factors. These modifications regulate the activity of proteins involved in GO:0044871. Functional validation uses point mutants that abrogate modification sites.
How CRISPR Can Be Used to Study GO:0044871 negative regulation by host of viral glycoprotein metabolic process
Knockout
CRISPR knockout of host genes such as MARCH2, MARCH3, DDX60, or SLC35B2 can test whether they are required for negative regulation of viral glycoprotein metabolic processes. Loss-of-function studies have shown that MARCH2/MARCH3 knockout increases Zika virus infection. Similarly, DDX60 knockout modulates CCHFV replication.
Point Mutation
Point mutations can abrogate catalytic activity or post-translational modification sites in host restriction factors. For example, catalytically dead MARCH2 or MARCH3 mutants can distinguish ubiquitin ligase activity from scaffolding functions. Phosphorylation-site mutants of interferon-stimulated genes can reveal regulatory mechanisms.
Knock-in
Knock-in of tagged or mutant alleles allows precise tracking and functional analysis of host restriction factors. Tagged knock-in of DDX60 or MARCH2 enables interactome and localization studies. Knock-in of viral glycoprotein genes into host cells can create reporter systems for restriction assays.
Overexpression
Overexpression of host restriction factors such as MARCH2, MARCH3, DDX60, or CD44c can suppress viral glycoprotein metabolic processes and reduce viral replication. Overexpression studies complement knockout approaches to establish sufficiency. Inducible overexpression systems allow temporal control of restriction.
How EDITGENE Supports negative regulation by host of viral glycoprotein metabolic process Research
Researchers studying negative regulation by host of viral glycoprotein metabolic process-related genes often need to determine whether a candidate gene is causally involved in restricting viral glycoprotein production or whether its effect is correlative. EDITGENE provides end-to-end CRISPR services to generate precisely engineered cell models that answer these questions.
Contact EDITGENE today to design your custom CRISPR model for negative regulation by host of viral glycoprotein metabolic process research.
Frequently Asked Questions About negative regulation by host of viral glycoprotein metabolic process
What is GO:0044871?
GO:0044871 is a Gene Ontology biological process term for negative regulation by host of viral glycoprotein metabolic process, where a host organism stops, prevents, or reduces viral glycoprotein metabolism.
What genes are involved in negative regulation by host of viral glycoprotein metabolic process?
Key genes include MARCH2, MARCH3, DDX60, SLC35B2, and CD44c, which have been experimentally linked to restriction of viral glycoprotein metabolism or related antiviral pathways.
How do host cells restrict viral glycoprotein production?
Host cells use ubiquitin ligases, interferon-stimulated effectors, and post-translational modifications to degrade or block viral glycoproteins and their biosynthetic machinery.
What viruses are affected by GO:0044871?
Zika virus, Crimean-Congo haemorrhagic fever virus, Akabane virus, and enterovirus 71 are examples where host factors negatively regulate viral glycoprotein metabolic processes.
What is the role of MARCH2 and MARCH3 in viral restriction?
MARCH2 and MARCH3 are membrane-associated ubiquitin ligases that target TIM-1 for degradation, limiting Zika virus infection and downstream glycoprotein metabolism.
How is DDX60 involved in Crimean-Congo haemorrhagic fever virus?
DDX60 is hijacked by CCHFV to promote replication via G-quadruplex unwinding, but its normal function can also restrict viral processes.
What experimental models are used to study GO:0044871?
CRISPR knockout, point-mutation, knock-in, and overexpression cell models, combined with proteomics and transcriptomics, are commonly used.
Why is host sulfation important for EV71 infection?
SLC35B2-mediated host sulfation is required for EV71 infection, revealing a metabolic dependency that can be targeted to restrict viral glycoprotein processing.
Can CRISPR screens identify host restriction factors?
Yes, genome-wide CRISPR knockout and activation screens can systematically identify host genes that negatively regulate viral glycoprotein metabolic processes.
What diseases are linked to defects in viral glycoprotein restriction?
Zika virus congenital syndrome, CCHFV haemorrhagic fever, Akabane virus congenital abnormalities, and EV71 hand-foot-and-mouth disease are linked to these pathways.
Conclusion
GO:0044871 captures a vital host defense strategy that limits viral glycoprotein metabolism and thereby restricts enveloped virus replication. Experimental evidence from Zika virus, CCHFV, Akabane virus, and EV71 models has identified key host factors such as MARCH2, MARCH3, DDX60, SLC35B2, and CD44c that execute this negative regulation. Continued research using CRISPR-based models and multi-omics approaches will further define the molecular rules of this process and reveal new host-directed antiviral targets.
References
- 1. Chamontin C et al.. 2021. Regulation of Viral Restriction by Post-Translational Modifications.. Viruses 13(11) PMID: 34835003
- 2. Zhang Q et al.. 2025. The membrane-associated ubiquitin ligases MARCH2 and MARCH3 target TIM-1 to limit Zika virus infection.. Cell Mol Immunol 22(9):1032-1044 PMID: 40817191
- 4. Cai J et al.. 2026. HIV-1 infection converts CD4(+) T cells to HLA class II-restricted CD8(+) T cells.. Sci Transl Med 18(852):eaec4912 PMID: 42234775
- 5. Gao H et al.. 2026. Host protein interactome profiling of Akabane virus glycoprotein Gc reveals specific mitochondrial genes regulate viral replication.. Vet Microbiol 312:110815 PMID: 41337974
- 6. Guo D et al.. 2022. SLC35B2 Acts in a Dual Role in the Host Sulfation Required for EV71 Infection.. J Virol 96(9):e0204221 PMID: 35420441
- 7. Cao L et al.. 2019. The negative regulation of piscine CD44c in viral and bacterial infection.. Dev Comp Immunol 96:135-143 PMID: 30885554
- 8. Sui Y et al.. 2025. Viral hijacking of host DDX60 promotes Crimean-Congo haemorrhagic fever virus replication via G-quadruplex unwinding.. PLoS Pathog 21(6):e1013278 PMID: 40577441
