GO:0047341 fucose-1-phosphate guanylyltransferase activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0047341 (fucose-1-phosphate guanylyltransferase activity) catalyzes the reversible conversion of beta-L-fucose 1-phosphate and GTP into GDP-beta-L-fucose and diphosphate, a key step in the de novo and salvage pathways of GDP-L-fucose biosynthesis.
• The enzyme is a nucleotidyltransferase that discriminates strongly among nucleotide sugars and uses GTP as its preferred substrate; catalytic residues have been mapped by site-directed mutagenesis.
• GDP-L-fucose produced by this activity is the obligate donor for all fucosylation reactions, including core fucosylation of N-glycans, which regulates receptor signaling, immune recognition, and neuronal function.
• Loss of GDP-fucose biosynthetic flux, including reduced fucose-1-phosphate guanylyltransferase activity, has been linked to depressive-like behaviors in chronic stress models and can be rescued by L-fucose administration.
• The enzyme is conserved from bacteria to humans; murine and human orthologs have been cloned and functionally expressed, enabling cross-species comparative studies.
• CRISPR-based knockout, point-mutation, and knock-in models are powerful tools to dissect the contribution of this activity to fucosylation-dependent physiology and disease.
Description
Fucose-1-phosphate guanylyltransferase activity (GO:0047341) is a molecular function that catalyzes the formation of GDP-beta-L-fucose from beta-L-fucose 1-phosphate and GTP, releasing diphosphate. This reaction represents a central step in the de novo and salvage pathways that supply GDP-L-fucose, the universal donor substrate for all fucosyltransferases. Because fucosylation modulates the structure and function of glycoproteins and glycolipids, the enzyme sits at the intersection of nucleotide sugar metabolism and glycan-mediated signaling. Researchers studying cell surface recognition, immune regulation, and neurobiology require a precise understanding of this activity to interpret how changes in fucosylation affect physiology. The enzyme has been cloned from mouse and human sources, and its catalytic mechanism has been dissected by kinetic and mutagenesis studies. This article integrates the QuickGO definition with verified literature to provide a research-grade overview of GO:0047341, its genes, its regulation, and the experimental models used to study it.
fucose-1-phosphate guanylyltransferase activity At A Glance
| GO ID | GO:0047341 |
|---|---|
| GO term | fucose-1-phosphate guanylyltransferase activity |
| Ontology | molecular_function |
| Synonym | GDP-fucose pyrophosphorylase activity; GDP-L-fucose pyrophosphorylase activity; GTP:fucose-1-phosphate guanylyltransferase activity; GTP:beta-L-fucose-1-phosphate guanylyltransferase activity |
| Major function | Catalyzes the formation of GDP-beta-L-fucose from beta-L-fucose 1-phosphate and GTP, a key step in GDP-L-fucose biosynthesis |
| Reaction | beta-L-fucose 1-phosphate + GTP + H+ = diphosphate + GDP-beta-L-fucose |
| Substrate specificity | Prefers GTP over other nucleoside triphosphates; discriminates among fucose-1-phosphate analogs |
| Catalytic residues | Identified by site-directed mutagenesis in human GTP fucose pyrophosphorylase |
| Pathway context | De novo and salvage pathways of GDP-L-fucose synthesis |
What Is GO:0047341?
According to the Gene Ontology, fucose-1-phosphate guanylyltransferase activity (GO:0047341) is defined as the catalysis of the reaction: beta-L-fucose 1-phosphate + GTP + H+ = diphosphate + GDP-beta-L-fucose. In other words, the enzyme transfers a guanylyl group from GTP to beta-L-fucose 1-phosphate, producing GDP-beta-L-fucose and releasing inorganic diphosphate. This activity is synonymous with GDP-fucose pyrophosphorylase, GDP-L-fucose pyrophosphorylase, and GTP:fucose-1-phosphate guanylyltransferase, reflecting its role in nucleotide sugar interconversion. The reaction is reversible in vitro, but under physiological conditions it contributes to the net synthesis of GDP-L-fucose, the substrate for fucosyltransferases.
Why Is fucose-1-phosphate guanylyltransferase activity Important in Cell Biology?
Fucose-1-phosphate guanylyltransferase activity is essential because it produces GDP-L-fucose, the sole donor substrate for fucosyltransferases that modify glycoproteins and glycolipids. Fucosylation influences cell adhesion, receptor signaling, immune recognition, and neuronal plasticity, and its dysregulation has been implicated in cancer, inflammation, and neuropsychiatric disorders. The enzyme's ability to discriminate among nucleotide sugars and its conserved catalytic mechanism make it a model for studying nucleotide sugar pyrophosphorylases. Moreover, recent evidence shows that restoring GDP-fucose biosynthesis, including this activity, can ameliorate stress-induced depressive-like behaviors, highlighting its therapeutic potential.
• Provides GDP-L-fucose for all fucosylation reactions, including core fucosylation of N-glycans.
• Regulates receptor tyrosine kinase signaling through core fucosylation of growth factor receptors.
• Modulates immune cell recognition and inflammation via selectin ligands and other fucosylated epitopes.
• Contributes to neuronal function and behavior; reduced activity is associated with depressive-like phenotypes in chronic stress models.
• Serves as a paradigm for nucleotide sugar pyrophosphorylase mechanism and substrate discrimination.
• Its salvage pathway enables recycling of free fucose into GDP-L-fucose, linking diet to glycan biosynthesis.
• Genetic or pharmacological manipulation of this activity can alter cell surface glycan profiles, affecting cell-cell interactions.
• The enzyme is conserved across species, facilitating comparative and evolutionary studies.
• Its catalytic residues are known, enabling targeted point-mutation studies.
• Dysregulation of GDP-fucose metabolism is observed in cancer and congenital disorders of glycosylation.
Molecular Mechanism of fucose-1-phosphate guanylyltransferase activity
Substrate binding and nucleotide specificity
In simple terms: The enzyme grabs GTP and fucose-1-phosphate and holds them in place for reaction.
Human GTP fucose pyrophosphorylase (GFPP) binds beta-L-fucose 1-phosphate and GTP in a sequential manner, with GTP serving as the preferred nucleotide donor. Substrate discrimination studies using analogs revealed that the enzyme has strict requirements for the guanine base and the fucose moiety, ensuring fidelity in GDP-L-fucose synthesis. The reaction is reversible, but the equilibrium favors GDP-L-fucose formation under physiological concentrations.
Catalytic mechanism and key residues
In simple terms: Specific amino acids in the enzyme's active site carry out the chemical reaction.
Site-directed mutagenesis of human GFPP identified catalytic amino acids that are essential for guanylyl transfer, including residues that coordinate the phosphate groups and stabilize the transition state. These studies showed that mutation of key lysine, arginine, and aspartate residues abolishes or severely reduces enzymatic activity, confirming their roles in catalysis. The mechanism likely involves nucleophilic attack of the fucose-1-phosphate oxygen on the alpha-phosphate of GTP, with departure of diphosphate.
Role in GDP-L-fucose biosynthesis
In simple terms: This enzyme is one of two routes that make GDP-fucose, the sugar donor for fucosylation.
GDP-L-fucose is synthesized via a de novo pathway from GDP-mannose and a salvage pathway from free fucose. In the salvage pathway, fucose is phosphorylated to beta-L-fucose 1-phosphate, which is then converted to GDP-L-fucose by fucose-1-phosphate guanylyltransferase. The de novo pathway also converges on GDP-L-fucose, and both pathways are required for normal fucosylation in mammals. The enzyme's activity therefore directly influences the cellular pool of GDP-L-fucose available for fucosyltransferases.
Regulation by substrate availability and stress
In simple terms: The enzyme's output can be tuned by how much fucose and GTP are available, and by stress signals.
Chronic social defeat stress in mice reduces the expression of genes in the GDP-fucose biosynthetic pathway, including the salvage enzyme, leading to decreased core fucosylation. L-fucose administration restores GDP-fucose levels and rescues depressive-like behaviors, indicating that substrate supply can drive flux through this activity. The enzyme is also sensitive to feedback inhibition by GDP-L-fucose and to the cellular energy charge via GTP availability.
Key Genes Involved in GO:0047341 fucose-1-phosphate guanylyltransferase activity
The following genes and proteins are directly or indirectly associated with fucose-1-phosphate guanylyltransferase activity and GDP-L-fucose metabolism.
| Gene | Major Role | Research Relevance |
|---|---|---|
| GFPP (human) | Encodes GTP fucose pyrophosphorylase, the enzyme catalyzing GO:0047341 | Catalytic mechanism and substrate specificity studies |
| Fpgt (mouse) | Murine ortholog of GFPP; salvage pathway enzyme | Cloning and expression in murine tissues |
| Fuk | Fucokinase; phosphorylates free fucose to fucose-1-phosphate | Upstream of GO:0047341 in the salvage pathway |
| Gmds | GDP-mannose 4,6-dehydratase; de novo pathway | Provides GDP-4-keto-6-deoxymannose for GDP-fucose synthesis |
| Fx | GDP-4-keto-6-deoxymannose 3,5-epimerase-4-reductase; de novo pathway | Final step of de novo GDP-L-fucose synthesis |
| Fut8 | Alpha-1,6-fucosyltransferase; adds core fucose to N-glycans | Major consumer of GDP-L-fucose produced via GO:0047341 |
| Fut4 | Alpha-1,3-fucosyltransferase; synthesizes Lewis X and sialyl Lewis X | Uses GDP-L-fucose for selectin ligand biosynthesis |
| Fut7 | Alpha-1,3-fucosyltransferase; leukocyte selectin ligand | Immune cell trafficking and inflammation |
| Slc35c1 | GDP-fucose transporter into Golgi | Links cytosolic GDP-fucose synthesis to Golgi fucosylation |
| Gne | UDP-GlcNAc 2-epimerase/ManNAc kinase; sialic acid pathway | Indirectly affects nucleotide sugar pools |
| Pmm2 | Phosphomannomutase 2; mannose-1-phosphate interconversion | Congenital disorder of glycosylation model |
| Dpm1 | Dolichol-phosphate mannosyltransferase | N-glycosylation pathway context |
| B4galt1 | Beta-1,4-galactosyltransferase; galactose addition | Competes with fucosylation for glycan substrates |
| Mgat5 | N-acetylglucosaminyltransferase V; branching | Regulates core fucosylation efficiency |
| St6gal1 | Alpha-2,6-sialyltransferase | Sialylation interplay with fucosylation |
| Gfpt1 | Glutamine-fructose-6-phosphate transaminase; hexosamine pathway | Supplies UDP-GlcNAc for glycan synthesis |
| Ogt | O-GlcNAc transferase; nutrient sensor | Cross-talk between O-GlcNAcylation and fucosylation |
How Is fucose-1-phosphate guanylyltransferase activity Regulated?
The activity of fucose-1-phosphate guanylyltransferase is regulated at multiple levels. Substrate availability of beta-L-fucose 1-phosphate and GTP directly controls flux through the reaction. In chronic social defeat stress, downregulation of salvage pathway genes, including the enzyme, reduces GDP-fucose biosynthesis and core fucosylation, while L-fucose supplementation restores activity. Feedback inhibition by GDP-L-fucose and competition with the de novo pathway further modulate the enzyme's contribution to the cellular GDP-fucose pool. Additionally, the enzyme's expression may be influenced by nutrient-sensing pathways that control nucleotide sugar metabolism, although direct transcriptional regulators remain to be fully defined.
fucose-1-phosphate guanylyltransferase activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| GFPP | Depression-like behaviors; reduced core fucosylation | Gfpp knockout mouse; chronic stress model |
| Fut8 | Cancer metastasis; immune evasion | Fut8 knockout cell lines; xenograft models |
| Slc35c1 | Leukocyte adhesion deficiency type II | Slc35c1 mutant knock-in cells |
| Fuk | Fucose salvage deficiency; glycosylation disorder | Fuk knockout mice |
| Gmds | Congenital disorder of glycosylation | Gmds point-mutation models |
Depression and stress-related disorders
Chronic social defeat stress in mice reduces the expression of GDP-fucose biosynthetic enzymes, including fucose-1-phosphate guanylyltransferase, leading to decreased core fucosylation and depressive-like behaviors. L-fucose administration restores GDP-fucose levels and ameliorates these behavioral deficits, suggesting that enhancing this activity or its substrate supply could be therapeutic.
Cancer and metastasis
Altered fucosylation is a hallmark of cancer, affecting cell adhesion, migration, and immune evasion. GDP-L-fucose produced via GO:0047341 is required for the synthesis of sialyl Lewis X and other fucosylated epitopes that promote metastasis. Targeting this activity could disrupt tumor glycan profiles, although direct evidence in cancer models is still emerging.
Congenital disorders of glycosylation
Defects in GDP-fucose biosynthesis, including mutations affecting the salvage pathway, can lead to leukocyte adhesion deficiency type II (LAD II) and other glycosylation disorders. While LAD II is primarily caused by defects in GDP-fucose transport, impaired synthesis via fucose-1-phosphate guanylyltransferase could contribute to similar phenotypes.
From fucose-1-phosphate guanylyltransferase activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of fucose-1-phosphate guanylyltransferase activity reduce GDP-L-fucose and core fucosylation? | GFPP knockout cell lines and mouse models |
| Which catalytic residues are essential for guanylyl transfer? | Point-mutation knock-in of GFPP active-site residues |
| Can restoring enzyme activity rescue stress-induced behavioral deficits? | Knock-in of wild-type GFPP in stress-susceptible mice |
| How does the enzyme interact with other GDP-fucose pathway proteins? | Tagged knock-in for affinity purification and proteomics |
| What is the effect of enzyme overexpression on cell surface fucosylation? | Overexpression of GFPP in mammalian cells |
| Can CRISPR library screening identify modifiers of GDP-fucose levels? | Genome-wide knockout library in fucosylation reporter cells |
How to Study the fucose-1-phosphate guanylyltransferase activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Enzymatic assay with GTP and fucose-1-phosphate | Guanylyltransferase activity | Kinetic characterization of wild-type and mutant enzymes |
| LC-MS glycomics | Core fucosylation and other fucosylated glycans | Assessing GDP-L-fucose pool changes in cells |
| RNA-seq | Expression of GDP-fucose pathway genes | Identifying transcriptional regulation in stress or disease |
| Proteomics | Fucosylated proteins and pathway enzyme levels | Mapping downstream effects of enzyme activity |
| CRISPR knockout library screening | Genes affecting fucosylation | Discovery of novel regulators of GDP-fucose metabolism |
| Site-directed mutagenesis | Catalytic residue function | Mechanistic studies of GFPP |
| Lectin blotting | Cell surface fucosylation | Rapid assessment of fucosylation status |
| Metabolic labeling with fucose analogs | Fucosylation flux | Dynamic measurement of fucose utilization |
Enzymatic assays for guanylyltransferase activity
Radioactive or fluorescent assays using beta-L-fucose 1-phosphate and GTP can measure the formation of GDP-L-fucose and diphosphate. Coupled enzyme assays with pyruvate kinase/lactate dehydrogenase or phosphate detection are commonly used to monitor activity in vitro.
Glycan profiling by mass spectrometry
Liquid chromatography-mass spectrometry (LC-MS) of released N-glycans can quantify core fucosylation and other fucosylated structures, providing a readout of GDP-L-fucose availability. This method is sensitive enough to detect changes in fucosylation in cells and tissues from knockout or knock-in models.
Transcriptomic and proteomic analysis
RNA-seq can reveal changes in expression of GDP-fucose pathway genes, while proteomics can identify fucosylated proteins and pathway enzymes. These approaches help link enzyme activity to downstream biological processes.
CRISPR-based genetic screens
Genome-wide CRISPR knockout or activation screens using fucosylation-specific lectins or antibodies can identify genes that regulate fucose-1-phosphate guanylyltransferase activity and GDP-L-fucose levels. Such screens are powerful for discovering novel regulators and therapeutic targets.
How CRISPR Can Be Used to Study GO:0047341 fucose-1-phosphate guanylyltransferase activity
Knockout
CRISPR-Cas9 knockout of GFPP or other GDP-fucose pathway genes in cell lines and mice can abolish fucose-1-phosphate guanylyltransferase activity, leading to reduced GDP-L-fucose and core fucosylation. These models are essential for studying the consequences of enzyme loss on cell signaling, immune function, and behavior.
Point Mutation
Point mutations in catalytic residues of GFPP, identified by mutagenesis studies, can be introduced via CRISPR knock-in to dissect the enzymatic mechanism in a physiological context. Such models allow separation of catalytic activity from protein-protein interactions.
Knock-in
Knock-in of wild-type or tagged GFPP can rescue knockout phenotypes or enable affinity purification and imaging. Tagged knock-in models are useful for studying enzyme localization and interactions within the GDP-fucose biosynthetic machinery.
Overexpression
CRISPR activation or cDNA overexpression of GFPP can increase GDP-L-fucose levels and enhance fucosylation, providing a gain-of-function system to study downstream effects. Overexpression models are valuable for testing whether increased enzyme activity can ameliorate disease phenotypes.
How EDITGENE Supports fucose-1-phosphate guanylyltransferase activity Research
Researchers studying fucose-1-phosphate guanylyltransferase activity-related genes often need to determine whether a candidate gene is causally involved in GDP-L-fucose biosynthesis, fucosylation, or disease phenotypes. EDITGENE provides comprehensive CRISPR-based services to generate precisely engineered cell and animal models, enabling rigorous functional validation of genes in this pathway.
Contact EDITGENE today to design your custom CRISPR model for fucose-1-phosphate guanylyltransferase activity research.
Frequently Asked Questions About fucose-1-phosphate guanylyltransferase activity
What is fucose-1-phosphate guanylyltransferase activity?
It is a molecular function (GO:0047341) that catalyzes the conversion of beta-L-fucose 1-phosphate and GTP into GDP-beta-L-fucose and diphosphate, a key step in GDP-L-fucose biosynthesis.
What genes are involved in fucose-1-phosphate guanylyltransferase activity?
The primary gene is GFPP (GTP fucose pyrophosphorylase) in humans and Fpgt in mice; upstream and downstream genes include Fuk, Gmds, Fx, and Fut8.
What is the reaction catalyzed by GO:0047341?
The reaction is: beta-L-fucose 1-phosphate + GTP + H+ = diphosphate + GDP-beta-L-fucose.
Why is GDP-L-fucose important?
GDP-L-fucose is the donor substrate for all fucosyltransferases, which modify glycoproteins and glycolipids involved in cell signaling, immune recognition, and neuronal function.
How is fucose-1-phosphate guanylyltransferase activity regulated?
It is regulated by substrate availability, feedback inhibition by GDP-L-fucose, and stress-induced changes in expression of salvage pathway genes.
What diseases are associated with defects in this activity?
Reduced activity has been linked to depressive-like behaviors in chronic stress models, and altered fucosylation is implicated in cancer and congenital disorders of glycosylation.
What experimental models are used to study GO:0047341?
Knockout mice and cell lines, point-mutation knock-ins, tagged knock-ins, overexpression models, and CRISPR library screens are commonly used.
Can L-fucose supplementation rescue phenotypes caused by reduced enzyme activity?
Yes, in chronic social defeat stress models, L-fucose administration restored GDP-fucose levels and ameliorated depressive-like behaviors.
What are the catalytic residues of human GTP fucose pyrophosphorylase?
Site-directed mutagenesis identified key lysine, arginine, and aspartate residues essential for catalysis.
How can I generate a knockout model for fucose-1-phosphate guanylyltransferase?
EDITGENE provides custom CRISPR knockout services for GFPP and related genes in various cell types, with validation by sequencing and functional assays.
Conclusion
Fucose-1-phosphate guanylyltransferase activity (GO:0047341) is a central enzymatic step in GDP-L-fucose biosynthesis, supplying the donor substrate for all fucosylation reactions. Its catalytic mechanism and substrate specificity have been well characterized, and its role in stress-related behaviors and cancer is emerging. CRISPR-based models, including knockout, point-mutation, and knock-in, are invaluable for dissecting its physiological functions and therapeutic potential. Continued research into this activity will advance our understanding of glycosylation in health and disease.
References
- 1. Zheng M et al.. 2026. L-fucose administration ameliorates chronic social defeat stress-induced depressive-like behaviors by restoring GDP-fucose biosynthetic activation and core fucosylation.. Front Immunol 17:1909378 PMID: 42597539
- 2. Niittymäki J et al.. 2004. Cloning and expression of murine enzymes involved in the salvage pathway of GDP-L-fucose.. Eur J Biochem 271(1):78-86 PMID: 14686921
- 3. Quirk S et al.. 2005. Substrate discrimination by the human GTP fucose pyrophosphorylase.. Biochemistry 44(32):10854-63 PMID: 16086588
- 4. Quirk S et al.. 2005. Identification of catalytic amino acids in the human GTP fucose pyrophosphorylase active site.. Biochemistry 44(39):13172-8 PMID: 16185085
