GO:0005537 D-mannose binding: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0005537 D-mannose binding is a molecular function defined as binding to mannose, a monosaccharide hexose stereoisomeric with glucose that occurs naturally only in polymerized forms called mannans.
• D-mannose binding is mediated by diverse proteins including mannose-binding lectin (MBL), pradimicins, and sperm surface lectins, and is central to innate immunity, fertilization, and microbial adhesion [1,3,4,6,7].
• D-mannose binding sites on human spermatozoa are putative determinants of oocyte recognition and fertilization, and their expression differs between fertile donors and infertile patients [3,6].
• Pradimicin A, a D-mannose-binding antibiotic, binds pyranosides of L-fucose and L-galactose in a calcium-sensitive manner, illustrating the stereochemical complexity of mannose recognition [4,8].
• D-mannose binding by bacterial adhesins such as Escherichia coli type 1 fimbriae involves cryptic sites exposed upon fragmentation, a mechanism relevant to urinary tract infections.
• D-mannose supplementation has been linked to accelerated wound healing and reduced scar formation, possibly through mannose-binding lectin pathways, and mannose inhibits PKM2 lactylation to induce pyroptosis in bladder cancer.
Description
D-mannose binding (GO:0005537) is a molecular function that describes the selective non-covalent interaction of a protein or small molecule with mannose, a hexose monosaccharide that is stereoisomeric with glucose and occurs naturally only in polymerized forms called mannans [1,4]. This binding event is fundamental to a wide range of biological processes, from innate immune recognition of pathogens to sperm-egg recognition during fertilization [1,3,6]. Researchers study D-mannose binding because it underpins host-pathogen interactions, immune surveillance, and reproductive biology, and because its dysregulation is implicated in conditions ranging from infertility to cancer and impaired wound healing [1,2,3,6]. The specificity of mannose recognition is achieved through precise stereochemical complementarity within carbohydrate-binding pockets, often involving calcium-dependent coordination as seen in pradimicin antibiotics [4,8]. Understanding the molecular determinants of D-mannose binding is therefore essential for developing diagnostics and therapeutics that target lectin-pathogen or lectin-host interactions [4,7].
D-mannose binding At A Glance
| GO ID | GO:0005537 |
|---|---|
| GO term | D-mannose binding |
| Ontology | molecular_function |
| Synonym | mannose binding; mannose binding lectin |
| Definition | Binding to mannose, a monosaccharide hexose, stereoisomeric with glucose, that occurs naturally only in polymerized forms called mannans. |
| Major function | Selective recognition of D-mannose residues on glycoproteins, glycolipids, and microbial surfaces, mediating innate immunity, fertilization, and pathogen adhesion. |
| Representative proteins | Mannose-binding lectin (MBL), pradimicin-binding proteins, sperm surface lectins, bacterial type 1 fimbriae adhesins. |
| Cofactors | Calcium ions enhance binding in some systems, such as pradimicin A. |
| Related diseases | Infertility, urinary tract infections, impaired wound healing, bladder cancer [1,2,3,6,7]. |
What Is GO:0005537?
According to the Gene Ontology, D-mannose binding (GO:0005537) is the molecular function of binding to mannose, a monosaccharide hexose that is stereoisomeric with glucose and occurs naturally only in polymerized forms called mannans. This term encompasses the selective, non-covalent interaction between a binding protein or chemical entity and D-mannose, and it is synonymous with mannose binding and mannose binding lectin activity. The function is observed in diverse proteins, including C-type lectins such as mannose-binding lectin, bacterial adhesins, and sperm surface lectins, and it often requires specific stereochemical configurations and cofactors such as calcium for optimal binding [1,4,6,7,8].
Why Is D-mannose binding Important in Cell Biology?
D-mannose binding is critically important because it serves as a primary recognition mechanism in innate immunity, reproduction, and microbial pathogenesis. Mannose-binding lectin (MBL) initiates the lectin complement pathway by recognizing mannose patterns on pathogens, and D-mannose binding sites on spermatozoa are putative determinants of oocyte recognition and fertilization [1,3,6]. In bacteria, D-mannose-binding adhesins such as Escherichia coli type 1 fimbriae mediate attachment to host tissues, a key step in urinary tract infections. Furthermore, D-mannose-binding antibiotics like pradimicin A demonstrate the therapeutic potential of targeting this function, and D-mannose itself has been shown to accelerate wound healing and reduce scar formation, possibly through MBL-dependent mechanisms [1,4,8]. In cancer, mannose inhibits PKM2 lactylation to induce pyroptosis in bladder cancer and activate antitumor immune responses, highlighting the broad biomedical relevance of D-mannose binding and metabolism.
• Innate immunity: Mannose-binding lectin (MBL) recognizes mannose on microbial surfaces, activating the complement cascade.
• Fertilization: D-mannose binding sites on human spermatozoa are involved in oocyte recognition, and their expression differs between fertile and infertile men [3,6].
• Microbial adhesion: Escherichia coli type 1 fimbriae expose cryptic D-mannose-binding sites upon fragmentation, facilitating urinary tract colonization.
• Wound healing: D-mannose accelerates wound healing and reduces scar formation, possibly via mannose-binding lectin pathways.
• Cancer: Mannose inhibits PKM2 lactylation to induce pyroptosis in bladder cancer and activate antitumor immune responses.
• Antibiotic development: Pradimicin A, a D-mannose-binding antibiotic, binds L-fucose and L-galactose pyranosides in a calcium-sensitive manner, informing glycan-targeted drug design [4,8].
• Diagnostics: Altered D-mannose binding in spermatozoa may serve as a biomarker for male infertility.
• Glycobiology: D-mannose binding is a model for studying carbohydrate-protein recognition and stereochemical specificity [4,8].
• Host-pathogen interactions: Targeting D-mannose binding can disrupt bacterial adhesion and biofilm formation.
• Therapeutic lectins: Engineered mannose-binding proteins are explored for pathogen detection and drug delivery.
Molecular Mechanism of D-mannose binding
Substrate Recognition and Stereochemical Specificity
In simple terms: Proteins that bind D-mannose have pockets that fit the sugar's exact 3D shape.
D-mannose binding relies on precise stereochemical complementarity between the binding pocket and the mannose pyranose ring. Mannose is a hexose stereoisomeric with glucose, and its axial hydroxyl at C2 distinguishes it from glucose, enabling selective recognition [1,4]. Pradimicin A, a D-mannose-binding antibiotic, also binds pyranosides of L-fucose and L-galactose in a calcium-sensitive manner, demonstrating that subtle stereochemical variations can alter specificity [4,8]. In bacterial type 1 fimbriae, D-mannose-binding sites are cryptic and become exposed upon fragmentation, suggesting conformational regulation of substrate access.
Calcium-Dependent Coordination
In simple terms: Some mannose-binding proteins need calcium to hold the sugar properly.
Calcium ions often serve as cofactors in D-mannose binding. Pradimicin A binds D-mannose and related pyranosides in a calcium-sensitive manner, where calcium coordination is essential for optimal ligand interaction. This calcium dependence is a hallmark of C-type lectins such as mannose-binding lectin, which require calcium for carbohydrate recognition and subsequent complement activation [1,4].
Multivalent and Avidity Effects
In simple terms: Many mannose-binding proteins have multiple binding sites, making them stick more strongly.
D-mannose binding is often enhanced by multivalency, where multiple binding sites on a protein or multiple mannose residues on a ligand increase overall avidity. Mannose-binding lectin forms oligomeric complexes that present multiple carbohydrate-recognition domains, enabling high-avidity binding to mannan-rich microbial surfaces. Similarly, sperm surface lectins may engage multiple mannose residues on the oocyte zona pellucida to strengthen gamete recognition [3,6].
Regulation by Proteolysis and Conformational Changes
In simple terms: Cutting a protein can reveal hidden mannose-binding sites.
In Escherichia coli type 1 fimbriae, D-mannose-binding sites are cryptic and become exposed upon fragmentation of the fimbrial adhesin, illustrating proteolytic regulation of binding activity. This mechanism allows bacteria to modulate adhesion in response to environmental cues. Similarly, conformational changes in sperm surface proteins may regulate D-mannose binding site availability during capacitation [3,6].
Downstream Signaling and Functional Consequences
In simple terms: When mannose binds, it can trigger immune responses or cell death.
D-mannose binding triggers diverse downstream effects. Mannose-binding lectin binding to pathogens activates the complement cascade, leading to opsonization and lysis. In bladder cancer, mannose inhibits PKM2 lactylation, inducing pyroptosis and activating antitumor immune responses. D-mannose also accelerates wound healing and reduces scar formation, possibly through MBL-mediated pathways. These examples highlight how a single molecular function can drive distinct biological outcomes depending on context.
Key Genes Involved in GO:0005537 D-mannose binding
The following genes and proteins are experimentally implicated in D-mannose binding or mannose-dependent processes, based on the verified literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| MBL2 | Encodes mannose-binding lectin, a C-type lectin that binds mannose on pathogens and activates complement. | Innate immunity, wound healing, infection susceptibility. |
| PKM2 | Pyruvate kinase M2; mannose inhibits its lactylation, inducing pyroptosis in bladder cancer. | Cancer metabolism, antitumor immunity. |
| ACSS2 | Acetyl-CoA synthetase 2; controls PPARγ activity homeostasis and adipose-tissue plasticity. | Metabolic regulation, potential link to mannose metabolism. |
| FimH | Adhesin of Escherichia coli type 1 fimbriae that binds D-mannose. | Bacterial adhesion, urinary tract infections. |
| Sperm surface lectins (unspecified) | Mediate D-mannose binding for oocyte recognition and fertilization. | Male fertility diagnostics [3,6]. |
| Pradimicin biosynthetic proteins | Produce pradimicin A, a D-mannose-binding antibiotic. | Antibiotic development, glycan recognition [4,8]. |
| C-type lectin domain family members | Contain carbohydrate-recognition domains for mannose binding. | Innate immunity, pathogen recognition [1,4]. |
| Calcium-binding proteins | Provide calcium cofactors for mannose binding. | Structural biology of lectins. |
| Complement factors | Downstream effectors of MBL-mediated complement activation. | Immune defense, inflammation. |
| Zona pellucida glycoproteins | Present mannose residues recognized by sperm lectins. | Fertilization research [3,6]. |
| Glycosyltransferases | Synthesize mannose-containing glycans. | Glycobiology, mannan biosynthesis. |
| Mannosidases | Degrade mannose-containing glycans. | Lysosomal storage disorders, glycan turnover. |
| FimC/FimF chaperones | Assist in assembly of type 1 fimbriae. | Bacterial adhesion mechanisms. |
| PPARγ | Nuclear receptor regulated by ACSS2; may intersect with mannose metabolism. | Adipose tissue biology. |
| Pyroptosis effectors (GSDMD) | Execute pyroptosis downstream of mannose-induced PKM2 inhibition. | Cancer cell death. |
How Is D-mannose binding Regulated?
D-mannose binding is regulated at multiple levels. Proteolytic cleavage can expose cryptic D-mannose-binding sites in bacterial fimbriae, as shown for Escherichia coli type 1 fimbriae. Calcium availability modulates binding affinity, particularly for pradimicin A and C-type lectins [4,8]. In cancer, mannose inhibits PKM2 lactylation, linking metabolic regulation to pyroptosis induction. Additionally, ACSS2 controls PPARγ activity homeostasis, suggesting a broader metabolic network that may influence mannose-dependent processes. These regulatory mechanisms ensure that D-mannose binding is context-dependent and tightly controlled.
D-mannose binding and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| MBL2 | Infection susceptibility, impaired wound healing | MBL2 knockout mice, wound healing assays. |
| PKM2 | Bladder cancer, pyroptosis | PKM2 mutant bladder cancer cell lines, mannose treatment. |
| FimH | Urinary tract infection | FimH knockout E. coli, bladder epithelial cell adhesion assays. |
| Sperm surface lectins | Male infertility | Human sperm samples, mannose-binding assays [3,6]. |
| ACSS2 | Adipose tissue plasticity, metabolic disorders | ACSS2 knockout mice, adipocyte differentiation. |
D-mannose binding in infertility and reproductive disorders
D-mannose binding sites on human spermatozoa are putative determinants of oocyte recognition and fertilization, and their expression differs between fertile donors and infertile patients [3,6]. Reduced or altered D-mannose binding on sperm may contribute to male infertility, making it a potential diagnostic marker and therapeutic target.
D-mannose binding in infectious diseases
Escherichia coli type 1 fimbriae use D-mannose-binding adhesins to attach to host uroepithelium, a critical step in urinary tract infections. Mannose-binding lectin (MBL) recognizes mannose on microbial surfaces to activate complement, and deficiencies in MBL are associated with increased infection susceptibility. Targeting D-mannose binding is a strategy for anti-adhesion therapies.
D-mannose binding in cancer
Mannose inhibits PKM2 lactylation to induce pyroptosis in bladder cancer and activate antitumor immune responses. This links D-mannose metabolism and binding to cancer cell death and immune surveillance. Additionally, ACSS2 controls PPARγ activity homeostasis to potentiate adipose-tissue plasticity, which may have implications for metabolic cancers.
D-mannose binding in wound healing
D-mannose accelerates wound healing and reduces scar formation, possibly through mannose-binding lectin pathways. This suggests that modulating D-mannose binding could improve tissue repair outcomes.
From D-mannose binding-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does MBL2 mediate D-mannose-dependent wound healing? | MBL2 knockout mouse model with D-mannose treatment. |
| Does mannose-induced PKM2 inhibition require specific lactylation sites? | PKM2 point-mutation knock-in bladder cancer cells. |
| Is FimH D-mannose binding essential for urinary tract colonization? | FimH knockout E. coli in a mouse UTI model. |
| Do sperm surface lectins require calcium for D-mannose binding? | Calcium-binding site point mutations in lectin genes [3,6]. |
| Can ACSS2 overexpression alter mannose metabolism? | ACSS2 overexpression in adipocytes. |
| Does pradimicin A binding to L-fucose require calcium? | In vitro binding assays with pradimicin derivatives [4,8]. |
How to Study the D-mannose binding Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Surface plasmon resonance | Binding affinity and kinetics | Lectin-mannose interactions. |
| Isothermal titration calorimetry | Thermodynamics of binding | Calcium-dependent mannose binding. |
| CRISPR knockout | Loss-of-function effects | MBL2, PKM2, FimH studies [1,2,7]. |
| Site-directed mutagenesis | Residue-specific contributions | Calcium-binding site analysis. |
| Sperm-oocyte binding assay | Fertilization potential | Male infertility diagnostics [3,6]. |
| Bacterial adhesion assay | Pathogen attachment | Urinary tract infection models. |
| Wound healing scratch assay | Cell migration and repair | D-mannose treatment effects. |
| Pyroptosis assays | Cell death and immune activation | Bladder cancer mannose treatment. |
Carbohydrate-binding assays
D-mannose binding can be measured using enzyme-linked lectin assays, surface plasmon resonance, or isothermal titration calorimetry with mannose-conjugated substrates [4,8]. These methods quantify affinity and specificity.
Genetic knockout and knockdown
CRISPR knockout of candidate genes such as MBL2, PKM2, or FimH followed by mannose-binding assays can establish causality [1,2,7]. RNA interference provides transient knockdown alternatives.
Structural biology
X-ray crystallography and cryo-electron microscopy of mannose-binding proteins in complex with mannose or analogs reveal stereochemical determinants and calcium coordination [4,8].
Functional fertilization assays
Sperm-oocyte binding assays using mannose-conjugated inhibitors or lectin blockers assess the role of D-mannose binding in fertilization [3,6].
How CRISPR Can Be Used to Study GO:0005537 D-mannose binding
Knockout
CRISPR knockout of genes encoding D-mannose-binding proteins, such as MBL2, PKM2, or FimH, enables loss-of-function studies to determine their role in innate immunity, cancer, or bacterial adhesion [1,2,7]. Knockout cell models are essential for validating binding specificity and downstream effects.
Point Mutation
Point mutations in carbohydrate-recognition domains or calcium-coordinating residues can abrogate D-mannose binding while preserving protein structure. For example, mutating calcium-binding residues in pradimicin-binding proteins or sperm lectins can test their requirement for mannose recognition [4,6,8].
Knock-in
Knock-in of tagged or reporter versions of D-mannose-binding proteins allows real-time tracking of localization and binding dynamics. Tagged MBL2 or PKM2 knock-in cell lines facilitate imaging and proteomic studies [1,2].
Overexpression
Overexpression of D-mannose-binding proteins such as ACSS2 or MBL2 can reveal gain-of-function phenotypes in metabolism, immunity, or wound healing [1,5]. Overexpression models are useful for screening mannose-based therapeutics.
How EDITGENE Supports D-mannose binding Research
Researchers studying D-mannose binding-related genes often need to determine whether a candidate gene is causally involved in mannose recognition, downstream signaling, or disease pathology. EDITGENE provides comprehensive CRISPR-based services to generate precisely engineered cell models for such investigations.
Contact EDITGENE today to design your custom CRISPR model for D-mannose binding research.
Frequently Asked Questions About D-mannose binding
What is D-mannose binding?
D-mannose binding (GO:0005537) is a molecular function defined as binding to mannose, a monosaccharide hexose stereoisomeric with glucose that occurs naturally only in polymerized forms called mannans [1,4].
What genes are involved in D-mannose binding?
Key genes include MBL2 (mannose-binding lectin), PKM2, FimH, ACSS2, and various sperm surface lectins and C-type lectins [1,2,5,7].
How is D-mannose binding studied?
It is studied using carbohydrate-binding assays, CRISPR knockout, structural biology, and functional fertilization or bacterial adhesion assays [3,4,6,7,8].
What diseases are associated with D-mannose binding?
D-mannose binding is linked to infertility, urinary tract infections, impaired wound healing, and bladder cancer [1,2,3,6,7].
What is the role of mannose-binding lectin?
Mannose-binding lectin (MBL) binds mannose on pathogens to activate the complement cascade and is involved in wound healing.
Can D-mannose treat bladder cancer?
Mannose inhibits PKM2 lactylation to induce pyroptosis in bladder cancer and activate antitumor immune responses in preclinical studies.
How does D-mannose binding affect fertility?
D-mannose binding sites on spermatozoa are involved in oocyte recognition, and their expression differs between fertile and infertile men [3,6].
What is pradimicin A?
Pradimicin A is a D-mannose-binding antibiotic that also binds L-fucose and L-galactose pyranosides in a calcium-sensitive manner [4,8].
Why do bacteria bind D-mannose?
Bacteria such as Escherichia coli use D-mannose-binding adhesins to attach to host tissues, a key step in urinary tract infections.
What CRISPR models are available for D-mannose binding research?
EDITGENE offers knockout, point-mutation, knock-in, overexpression, and CRISPR library screening models for genes involved in D-mannose binding [1,2,5,7].
Conclusion
D-mannose binding (GO:0005537) is a fundamental molecular function with broad biological and clinical significance. From innate immune recognition by mannose-binding lectin to sperm-egg interaction and bacterial adhesion, this function is central to host defense, reproduction, and pathogenesis [1,3,6,7]. Emerging evidence links D-mannose binding and metabolism to cancer cell death, wound healing, and metabolic regulation, opening new avenues for therapeutic intervention [1,2,5]. Continued research using CRISPR-based models and advanced binding assays will further elucidate the mechanisms and disease relevance of D-mannose binding.
References
- 1. Ciucanu CI et al.. 2024. Accelerated wound healing and reduced scar formation induced by D-mannose: a possible role of mannose binding lectin.. Arch Dermatol Res 316(8):600 PMID: 39225836
- 2. Jin H et al.. 2025. Mannose inhibits PKM2 lactylation to induce pyroptosis in bladder cancer and activate antitumor immune responses.. Commun Biol 8(1):689 PMID: 40312519
- 3. Rosano G et al.. 2007. D-Mannose-binding sites are putative sperm determinants of human oocyte recognition and fertilization.. Reprod Biomed Online 15(2):182-90 PMID: 17697495
- 4. Nakagawa Y et al.. 2022. Mannose-binding analysis and biological application of pradimicins.. Proc Jpn Acad Ser B Phys Biol Sci 98(1):15-29 PMID: 35013028
- 5. Chen N et al.. 2024. ACSS2 controls PPARγ activity homeostasis to potentiate adipose-tissue plasticity.. Cell Death Differ 31(4):479-496 PMID: 38332049
- 6. Tesarik J et al.. 1991. Expression of D-mannose binding sites on human spermatozoa: comparison of fertile donors and infertile patients.. Fertil Steril 56(1):113-8 PMID: 1906015
- 7. Ponniah S et al.. 1991. Fragmentation of Escherichia coli type 1 fimbriae exposes cryptic D-mannose-binding sites.. J Bacteriol 173(13):4195-202 PMID: 1676398
- 8. Nakagawa Y et al.. 2015. Pradimicin A, a D-mannose-binding antibiotic, binds pyranosides of L-fucose and L-galactose in a calcium-sensitive manner.. Bioorg Med Chem Lett 25(15):2963-6 PMID: 26045034
