GO:0046920 alpha-(1->3)-fucosyltransferase activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0046920 describes the enzymatic activity that transfers L-fucose from GDP-beta-L-fucose to an acceptor to form an alpha-(1->3) linkage, a key step in fucosylated glycan biosynthesis [1,2].
• Alpha-(1->3)-fucosyltransferases (FUTs) such as FUT7 are essential for selectin ligand biosynthesis and leukocyte trafficking.
• Dysregulated alpha-(1->3)-fucosyltransferase activity is linked to hepatocellular carcinoma and other cancers, where elevated enzyme levels or sLex expression correlate with disease [7,8].
• Microbial enzymes, including Helicobacter pylori alpha-1,3-fucosyltransferase, are used in engineered biosynthesis of human milk oligosaccharides like 3-fucosyllactose [1,5].
• FUT7 activity modulates insulin receptor signaling, indicating roles beyond glycosylation in metabolic regulation.
• CRISPR-based knockout, knock-in, point mutation, and overexpression models enable causal dissection of alpha-(1->3)-fucosyltransferase function in health and disease [6,7].
Description
Alpha-(1->3)-fucosyltransferase activity (GO:0046920) is a molecular function defined as the catalysis of L-fucose transfer from GDP-beta-L-fucose to an acceptor molecule, forming an alpha-(1->3) linkage [1,2]. This activity is central to the biosynthesis of fucosylated glycans, including sialyl Lewis X (sLex) and Lewis X structures, which mediate cell-cell recognition, adhesion, and signaling [6,7]. Enzymes with this activity are widely distributed from bacteria to humans and are critical for both normal physiology and disease pathogenesis [1,4,6]. Researchers study alpha-(1->3)-fucosyltransferase activity to understand leukocyte trafficking, host-microbe interactions, and cancer progression [6,7,8]. In humans, the alpha-(1->3)-fucosyltransferase FUT7 is essential for selectin ligand biosynthesis, and its loss impairs inflammatory responses. Elevated plasma alpha-(1->3)-L-fucosyltransferase activity has been observed in hepatocellular carcinoma patients, suggesting its potential as a biomarker. In biotechnology, bacterial and engineered enzymes are harnessed for the production of human milk oligosaccharides such as 3-fucosyllactose [1,5]. This article integrates authoritative QuickGO annotation with verified PubMed literature to provide a research-grade overview of GO:0046920, covering its mechanism, key genes, disease relevance, and experimental models. It is intended for scientists seeking to investigate this activity using CRISPR-based approaches and other molecular tools.
alpha-(1->3)-fucosyltransferase activity At A Glance
| GO ID | GO:0046920 |
|---|---|
| GO term | alpha-(1->3)-fucosyltransferase activity |
| Ontology | molecular_function |
| Synonym | alpha-1,3-fucosyltransferase activity; alpha(1,3)-fucosyltransferase activity; alpha-(1,3)-fucosyltransferase activity |
| Definition | Catalysis of the transfer of an L-fucosyl group from GDP-beta-L-fucose to an acceptor molecule to form an alpha-(1->3) linkage. |
| Major function | Biosynthesis of alpha-(1->3)-fucosylated glycans, including selectin ligands and Lewis antigens. |
| Representative enzymes | FUT7 (human), Helicobacter pylori alpha-1,3-fucosyltransferase, Schistosoma mansoni alpha-1,3-fucosyltransferase. |
| Substrates | GDP-beta-L-fucose as donor; various acceptors such as N-acetyllactosamine. |
| Cellular context | Golgi apparatus for eukaryotic enzymes; also found in some bacteria and parasites. |
What Is GO:0046920?
Alpha-(1->3)-fucosyltransferase activity (GO:0046920) is the catalytic function of transferring an L-fucosyl group from GDP-beta-L-fucose to an acceptor molecule, creating an alpha-(1->3) glycosidic linkage [1,2]. This activity is classified as a molecular_function in the Gene Ontology and is synonymous with alpha-1,3-fucosyltransferase activity, alpha(1,3)-fucosyltransferase activity, and alpha-(1,3)-fucosyltransferase activity. It is distinct from other fucosyltransferase activities that form different linkages (e.g., alpha-(1->2), alpha-(1->4), or alpha-(1->6)).
Why Is alpha-(1->3)-fucosyltransferase activity Important in Cell Biology?
Alpha-(1->3)-fucosyltransferase activity is critical for the synthesis of fucosylated glycans that mediate essential biological processes, including leukocyte adhesion and trafficking, host-pathogen interactions, and immune regulation. In humans, the enzyme FUT7 is required for the biosynthesis of L-, E-, and P-selectin ligands, and its deficiency leads to impaired leukocyte recruitment. Dysregulated activity is associated with cancer progression, as elevated enzyme levels and sLex expression promote tumor cell adhesion and metastasis [7,8]. Moreover, microbial alpha-(1->3)-fucosyltransferases are valuable biocatalysts for producing human milk oligosaccharides, which have nutritional and therapeutic benefits [1,5]. Understanding this activity is therefore relevant to immunology, oncology, glycobiology, and biotechnology.
• Essential for selectin ligand biosynthesis and leukocyte trafficking.
• Implicated in cancer progression, including hepatocellular carcinoma, through sLex expression [7,8].
• Modulates insulin receptor signaling pathways.
• Enables biosynthesis of human milk oligosaccharides like 3-fucosyllactose in engineered microbes [1,5].
• Plays a role in host-parasite interactions, as seen in Schistosoma mansoni.
• Provides a target for glycoengineering and rational enzyme design [2,5].
• Serves as a potential biomarker for hepatocellular carcinoma.
• Facilitates studies of cell-cell recognition and adhesion.
• Offers a model for understanding glycosyltransferase mechanism and specificity.
• Supports development of therapeutic glycans and inhibitors [2,7].
Molecular Mechanism of alpha-(1->3)-fucosyltransferase activity
Substrate Recognition and Binding
In simple terms: The enzyme grabs the sugar donor and the acceptor molecule.
Alpha-(1->3)-fucosyltransferases bind GDP-beta-L-fucose as the donor substrate and an acceptor molecule, typically a terminal N-acetyllactosamine unit on a glycan chain [1,2]. The binding site recognizes the guanosine diphosphate moiety and the fucose ring, positioning the donor for transfer. Structural studies of Helicobacter pylori alpha-1,3-fucosyltransferase have revealed key residues that interact with GDP-fucose and the acceptor, guiding rational design.
Catalytic Transfer and Linkage Formation
In simple terms: The enzyme snips off fucose and attaches it to the acceptor with a specific 1->3 bond.
The catalytic mechanism involves the transfer of the L-fucosyl group from GDP-beta-L-fucose to the acceptor, forming an alpha-(1->3) glycosidic linkage [1,2]. This reaction likely proceeds via an oxocarbenium ion-like transition state, with conserved acidic residues facilitating leaving-group departure and nucleophilic attack by the acceptor. The enzyme ensures regiospecificity for the 1->3 position, distinguishing it from other fucosyltransferases.
Cofactors and Metal Requirements
In simple terms: Most of these enzymes do not need metal helpers, but some may rely on specific conditions.
Alpha-(1->3)-fucosyltransferases generally do not require divalent metal ions for activity, unlike some other glycosyltransferases [1,2]. However, optimal activity may depend on pH and ionic conditions, as observed for the Schistosoma mansoni enzyme. No specific cofactors beyond the donor substrate GDP-fucose have been reported for the human FUT7 enzyme.
Enzyme Regulation and Specificity
In simple terms: The enzyme's activity can be tuned by mutations or cellular signals.
Enzyme activity can be modulated by mutations that alter substrate specificity or catalytic efficiency, as shown by structure-guided iterative mutagenesis of alpha-1,3-fucosyltransferase. In cells, expression levels of FUT7 are regulated during leukocyte activation and differentiation. Additionally, FUT7 activity influences insulin receptor signaling, suggesting cross-talk with metabolic pathways.
Key Genes Involved in GO:0046920 alpha-(1->3)-fucosyltransferase activity
The following genes encode enzymes with alpha-(1->3)-fucosyltransferase activity or are closely associated with its function in humans and model organisms.
| Gene | Major Role | Research Relevance |
|---|---|---|
| FUT7 | Alpha-(1->3)-fucosyltransferase that synthesizes selectin ligands | Essential for leukocyte trafficking; knockout mice show immunodeficiency |
| FUT4 | Alpha-(1->3)-fucosyltransferase involved in Lewis X synthesis | Implicated in cancer and inflammation; potential therapeutic target |
| FUT9 | Alpha-(1->3)-fucosyltransferase expressed in brain | Role in neural development and cognition; understudied |
| FUT3 | Alpha-(1->3/4)-fucosyltransferase | Polymorphisms affect Lewis antigen expression; linked to cancer risk |
| FUT5 | Alpha-(1->3)-fucosyltransferase | Expressed in digestive tissues; potential role in host-microbe interactions |
| FUT6 | Alpha-(1->3)-fucosyltransferase | Involved in sLex biosynthesis; associated with cancer metastasis |
| FUT10 | Alpha-(1->3)-fucosyltransferase | Expressed in various tissues; function less characterized |
| FUT11 | Alpha-(1->3)-fucosyltransferase | May play a role in Notch signaling; emerging research area |
| HpFucT | Helicobacter pylori alpha-1,3-fucosyltransferase | Used for 3-fucosyllactose production; model for enzyme engineering |
| SmFucT | Schistosoma mansoni alpha-1,3-fucosyltransferase | Parasite enzyme; potential drug target |
| BsuFucT | Bacillus subtilis alpha-1,3-fucosyltransferase | Engineered for de novo GDP-fucose pathway |
| POFUT1 | Protein O-fucosyltransferase 1 (alpha-(1->3) on proteins) | Not GO:0046920 but related; involved in Notch signaling |
| POFUT2 | Protein O-fucosyltransferase 2 | Related activity; thrombospondin repeats |
| FUT1 | Alpha-(1->2)-fucosyltransferase | Distinct linkage; included for contrast |
| FUT2 | Alpha-(1->2)-fucosyltransferase | Secretor status; distinct from GO:0046920 |
| FUT8 | Alpha-(1->6)-fucosyltransferase | Core fucosylation; distinct linkage |
| FUT12 | Alpha-(1->3)-fucosyltransferase | Plant enzyme; involved in xyloglucan fucosylation |
| FUT13 | Alpha-(1->3)-fucosyltransferase | Plant enzyme; similar to FUT12 |
How Is alpha-(1->3)-fucosyltransferase activity Regulated?
Alpha-(1->3)-fucosyltransferase activity is regulated at multiple levels. Transcriptional control of FUT7 occurs during leukocyte activation, with expression induced by inflammatory stimuli. Post-translational modifications and Golgi localization also influence enzyme activity. In cancer, elevated enzyme activity in plasma of hepatocellular carcinoma patients suggests systemic regulation. Additionally, FUT7 activity intersects with insulin receptor signaling, indicating potential feedback regulation by metabolic pathways. Structure-guided mutagenesis studies have shown that enzyme activity can be rationally tuned by altering key residues, providing insights into intrinsic regulatory mechanisms.
alpha-(1->3)-fucosyltransferase activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| FUT7 | Leukocyte adhesion deficiency, cancer | FUT7 knockout mice; siRNA knockdown in hepatocarcinoma cells [6,7] |
| FUT4 | Inflammation, cancer metastasis | Overexpression and knockout in cancer cell lines |
| FUT3 | Cancer risk, Lewis antigen disorders | Point mutation knock-in models |
| HpFucT | Bacterial pathogenesis, oligosaccharide production | Engineered E. coli for 3-fucosyllactose |
| SmFucT | Schistosomiasis | Parasite enzyme inhibition assays |
Hepatocellular Carcinoma
Increased plasma alpha-(1->3)-L-fucosyltransferase activity has been observed in patients with hepatocellular carcinoma, suggesting its potential as a biomarker. Knockdown of FUT7 by siRNA inhibits sLex expression and hepatocarcinoma cell proliferation, indicating a role in tumor growth. These findings highlight alpha-(1->3)-fucosyltransferase activity as a contributor to liver cancer progression.
Leukocyte Adhesion Deficiency
FUT7 deficiency in mice results in the absence of L-, E-, and P-selectin ligands, leading to impaired leukocyte trafficking and immunodeficiency. This underscores the essential role of alpha-(1->3)-fucosyltransferase activity in immune surveillance and inflammation.
Metabolic and Signaling Disorders
FUT7 regulates signaling molecules of the insulin receptor pathway, suggesting that dysregulated alpha-(1->3)-fucosyltransferase activity may contribute to metabolic disorders. Further research is needed to establish causal links.
Parasitic Infections
Schistosoma mansoni expresses an alpha-1,3-fucosyltransferase that may modify host glycans, potentially aiding immune evasion. Targeting this enzyme could provide a therapeutic strategy against schistosomiasis.
From alpha-(1->3)-fucosyltransferase activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does FUT7 loss impair leukocyte trafficking? | FUT7 knockout mouse |
| Can alpha-(1->3)-fucosyltransferase activity be enhanced for oligosaccharide production? | Point mutation knock-in in bacterial enzyme |
| Does FUT7 knockdown reduce tumor growth? | siRNA knockdown in hepatocarcinoma cells |
| What is the role of FUT7 in insulin signaling? | Overexpression in insulin-responsive cells |
| Can engineered Bacillus subtilis produce 3-fucosyllactose? | Knock-in of fucosyltransferase with de novo GDP-fucose pathway |
| Is plasma fucosyltransferase a biomarker for HCC? | Clinical sample analysis |
How to Study the alpha-(1->3)-fucosyltransferase activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Radioactive activity assay | Enzyme activity using GDP-[14C]fucose | Kinetic characterization |
| Mass spectrometry | Glycan structures and fucosylation | Detection of sLex and Lewis antigens |
| Lectin blotting | Presence of specific fucosylated epitopes | Cell surface glycan analysis |
| CRISPR knockout | Loss of gene function | Phenotypic studies in cells and mice |
| Site-directed mutagenesis | Effect of point mutations on activity | Structure-function analysis |
| Heterologous expression | Production of recombinant enzyme | Biocatalysis and engineering [1,5] |
| siRNA knockdown | Transient gene silencing | Cancer cell proliferation assays |
| Clinical biomarker assays | Plasma enzyme activity | HCC diagnosis and monitoring |
Enzymatic Activity Assays
Alpha-(1->3)-fucosyltransferase activity can be measured using radiolabeled GDP-[14C]fucose and acceptor substrates, followed by product separation and quantification. Such assays are used to characterize enzyme kinetics and inhibitor screening.
Glycan Analysis
Mass spectrometry and lectin blotting can detect alpha-(1->3)-fucosylated glycans, such as sLex, on cell surfaces or in secretions [6,7]. These methods are essential for linking enzyme activity to biological outcomes.
Genetic Manipulation
CRISPR-Cas9 knockout, knock-in, and point mutation models enable precise dissection of gene function in cells and animals [6,7]. Overexpression studies help assess gain-of-function effects.
Structural Biology
X-ray crystallography and cryo-EM can resolve the structure of alpha-(1->3)-fucosyltransferases, guiding rational design and mutagenesis.
How CRISPR Can Be Used to Study GO:0046920 alpha-(1->3)-fucosyltransferase activity
Knockout
CRISPR-Cas9 knockout of FUT7 or other alpha-(1->3)-fucosyltransferase genes can abolish enzyme activity, enabling studies of loss-of-function phenotypes such as impaired selectin ligand biosynthesis and leukocyte trafficking. Knockout cell lines are valuable for dissecting downstream signaling and glycosylation changes.
Point Mutation
Introducing point mutations into the catalytic domain of alpha-(1->3)-fucosyltransferases via CRISPR can reveal residues critical for substrate binding and catalysis. Such models help validate structural predictions and engineer enzymes with altered specificity.
Knock-in
Knock-in of tagged or reporter versions of FUT7 allows real-time tracking of enzyme localization and activity in live cells. Knock-in of disease-associated variants can model their functional impact.
Overexpression
CRISPR activation or lentiviral overexpression of alpha-(1->3)-fucosyltransferases can increase sLex levels and promote cell adhesion, providing gain-of-function models for cancer and inflammation research.
How EDITGENE Supports alpha-(1->3)-fucosyltransferase activity Research
Researchers studying alpha-(1->3)-fucosyltransferase activity-related genes often need to determine whether a candidate gene is causally involved in glycosylation, cell adhesion, or disease progression. EDITGENE provides comprehensive CRISPR-based services to generate precisely engineered cell models, enabling rigorous functional validation.
Contact EDITGENE today to design your custom CRISPR model for alpha-(1->3)-fucosyltransferase activity research.
Frequently Asked Questions About alpha-(1->3)-fucosyltransferase activity
What is alpha-(1->3)-fucosyltransferase activity?
It is the enzymatic activity that transfers L-fucose from GDP-beta-L-fucose to an acceptor to form an alpha-(1->3) linkage, as defined by GO:0046920 [1,2].
What genes are involved in alpha-(1->3)-fucosyltransferase activity?
Key human genes include FUT7, FUT4, FUT9, FUT3, FUT5, FUT6, FUT10, and FUT11, among others [6,7].
Which diseases are linked to alpha-(1->3)-fucosyltransferase activity?
It is associated with hepatocellular carcinoma, leukocyte adhesion deficiency, and parasitic infections [6,7,8].
How is alpha-(1->3)-fucosyltransferase activity measured?
Common methods include radioactive activity assays with GDP-[14C]fucose, mass spectrometry, and lectin blotting [4,6].
What is the role of FUT7 in leukocyte trafficking?
FUT7 is essential for the biosynthesis of selectin ligands, and its loss impairs leukocyte adhesion and migration.
Can alpha-(1->3)-fucosyltransferase be used for industrial oligosaccharide production?
Yes, bacterial enzymes like Helicobacter pylori alpha-1,3-fucosyltransferase are used to produce 3-fucosyllactose in engineered microbes [1,5].
What are the substrates of alpha-(1->3)-fucosyltransferases?
The donor substrate is GDP-beta-L-fucose, and acceptors are typically N-acetyllactosamine-containing glycans [1,2].
How does alpha-(1->3)-fucosyltransferase activity affect cancer?
Elevated activity and sLex expression promote tumor cell adhesion and proliferation, as seen in hepatocarcinoma [7,8].
What CRISPR models are available to study this activity?
Knockout, point mutation, knock-in, and overexpression models can be generated in cell lines and animals [6,7].
Is alpha-(1->3)-fucosyltransferase activity conserved across species?
Yes, enzymes with this activity are found in humans, bacteria, and parasites, though sequences vary [1,4].
Conclusion
Alpha-(1->3)-fucosyltransferase activity (GO:0046920) is a fundamental enzymatic function that shapes fucosylated glycans critical for immunity, cancer, and host-microbe interactions. Its study spans glycobiology, oncology, and biotechnology, with FUT7 serving as a paradigm for selectin ligand biosynthesis. Dysregulation of this activity is linked to hepatocellular carcinoma and leukocyte adhesion deficiency, underscoring its clinical relevance. CRISPR-based models, including knockout, point mutation, knock-in, and overexpression, provide powerful tools to dissect the causal roles of alpha-(1->3)-fucosyltransferases. EDITGENE offers comprehensive services to generate these models, enabling researchers to accelerate discoveries in glycosylation biology and therapeutic development.
References
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- 2. Li M et al.. 2025. Structure-Guided Iterative Mutagenesis Drives Dual-Functional Evolution of α-1,3-Fucosyltransferase.. J Agric Food Chem 73(37):23523-23534 PMID: 40899883
- 3. Wang QY et al.. 2007. Alpha 1,3-fucosyltransferase-VII regulates the signaling molecules of the insulin receptor pathway.. FEBS J 274(2):526-38 PMID: 17229154
- 4. DeBose-Boyd R et al.. 1996. Schistosoma mansoni: characterization of an alpha 1-3 fucosyltransferase in adult parasites.. Exp Parasitol 82(1):1-10 PMID: 8617325
- 5. Xie Y et al.. 2024. Rational Design of an α-1,3-Fucosyltransferase for the Biosynthesis of 3-Fucosyllactose in Bacillus subtilis ATCC 6051a via De Novo GDP-l-Fucose Pathway.. J Agric Food Chem 72(2):1178-1189 PMID: 38183288
- 6. Malý P et al.. 1996. The alpha(1,3)fucosyltransferase Fuc-TVII controls leukocyte trafficking through an essential role in L-, E-, and P-selectin ligand biosynthesis.. Cell 86(4):643-53 PMID: 8752218
- 7. Li D et al.. 2018. α-1,3-Fucosyltransferase-VII siRNA inhibits the expression of SLex and hepatocarcinoma cell proliferation.. Int J Mol Med 42(5):2700-2708 PMID: 30226570
- 8. Hada T et al.. 1995. Increased plasma alpha (1 --> 3)-L-fucosyltransferase activities in patients with hepatocellular carcinoma.. Glycoconj J 12(5):627-31 PMID: 8595252
