Carbohydrates mediate many biological processes through multivalent interactions, yet translating this chemistry into nanomaterials has been difficult: carbohydrate ligands are bulky and highly water-soluble, and scaffolds that present them usually rely on co-assembly with unmodified building blocks, diluting ligand density and erasing precise spatial control. Hribernik, et al. (2026) reported a supramolecular strategy in which fully synthetic cellulose oligomers self-assemble into crystalline nanomaterials that display glycan epitopes at defined density and orientation. The work appeared in Angewandte Chemie International Edition.

Why Glycan Presentation on Materials Is Hard

Surface engineering of nanomaterials with atomic precision can generate unique physical and chemical properties, and patterned ligand display is widely used to mimic the multivalent interactions that govern cell adhesion and signaling. Common scaffolds—nanoparticles, polymers, and metal complexes—either permit only a statistical ligand distribution or accommodate only a few ligands. For large, hydrophilic carbohydrates, the usual workaround of co-assembling ligand-bearing and blank monomers sacrifices both density and spatial order. Precise control of glycan density, spacing, and orientation is, however, essential for recognition by carbohydrate-binding proteins.

Cellulose Oligomers Assemble into Patterned Nanocrystals

The authors used fully synthetic cellulose oligomers produced by automated glycan assembly (AGA), which let them control sequence, length, and modification. Synthetic cellulose hexasaccharides (A₆) spontaneously self-assemble in water into nanocrystals with a cellulose II crystal structure, in which the (001) surface presents an alternating pattern of reducing and non-reducing glucose termini. Replacing one terminus with a different monosaccharide—β-linked D-galactose in GA₆, α-linked D-mannose in MA₆, or α-linked L-fucose in EA₇—preserves the cellulose II lattice while installing a controlled, non-glucosidic ligand on the crystal face. Notably, the shorter EA₆ counterpart suffered from increased solubility that disrupted assembly, and only after extending the cellulose stacking core by one additional D-glucose unit (to give EA₇) were rod-like structures recovered. This establishes a general, modular platform for Glycomics of surface-presented carbohydrates and for Glycan Profiling of epitope display.

Fig. 1 Cellulose-based nanomaterials with patterned surfaces. a): Structure and assembly of cellulose hexamer A₆. b): SNFG structure representation and assembly of functionalized cellulose oligomers XA_n, exemplified for GA₆. Comparison of XRD and TEM of crystallites obtained from the assembly of A₆ and GA₆ confirming the cellulose II type of structure and morphological similarities between the two assemblies. (Hribernik, et al. 2026)

From Nanocrystals to Thermoresponsive Hydrogels

Introducing a 3,6-methylated glucose unit (C) changed the material behavior. While methylated heptamers still formed cellulose II crystallites, annealing produced markedly different gel strengths depending on backbone length and methylated-unit position: CA₆ and A₆C displayed only weak gel-like properties, whereas CA₇ and A₇C formed true hydrogels with storage moduli exceeding loss moduli. CA₈C, bearing methylated units at both termini, exhibited the highest storage modulus (approx. 15 Pa) and fast, self-healing behavior in recovery tests. Stiffness was further tunable by concentration and by temperature: the gels liquefied near 5 °C and re-formed above 10 °C, mirroring the thermoresponsive behavior of methylcellulose. Dedicated Oligosaccharide Analysis and Glycan Sequencing of the building blocks support reproducible synthesis of these defined oligomers.

Dense, Modular Glycan Surfaces as Biological Cues

Combining an A₈ cellulose core with a methylated unit at the reducing end and a glycan epitope (X) at the non-reducing end yielded XA₈C hydrogels that display glycan epitopes at roughly 1.5 glycans nm−2 with a regular ∼0.90 nm spacing. The system proved modular across D-galactose, D-mannose, L-rhamnose, L-fucose, D-GlcNAc, and D-GalNAc, with bulk mechanical properties largely independent of epitope identity. Because mucin glycans in biological matrices often carry modifications followed by dedicated Sialic Acid Analysis workflows, and because the cellulose backbone can itself be produced by Custom Oligosaccharides Synthesis, the platform bridges materials chemistry and glycobiology.

Fig. 2 Fluorescence microscopy images of the filamentation of C. albicans cells after 8 h in the presence of a): controls (YPD medium with 10% FBS, 0.5% (w/w) Muc2, 2.0% (w/w) methylcellulose MC, 2.0% (w/w) MC + 2.0% (w/w) L-Rha) and b): 2.0% (w/w) synthetic hydrogels GA₈C, MA₈C, EA₈C, RA₈C, QA₈C, NA₈C, CA₈C. Scale bar 10 µm. Further experimental details are reported in Supporting Information section 3. (Hribernik, et al. 2026)

Glycan Identity Directs Fungal Morphology

To test the biological relevance of the displayed glycans, the authors performed a filamentation assay with Candida albicans, an opportunistic fungal pathogen whose morphology is regulated by environmental glycans. Hydrogels displaying D-galactose, D-mannose, L-fucose, or L-rhamnose kept cells predominantly in the yeast form, while D-GlcNAc and D-GalNAc epitopes arrested filamentation at the pseudo-hyphae stage; the unmodified CA₈C control did not inhibit hyphae formation. Muc2, a densely glycosylated mucin, prevented filamentation entirely, and a viability assay confirmed that the morphological differences were not due to cytotoxicity. Control experiments with methylcellulose alone, free L-rhamnose, or methylcellulose plus L-rhamnose all resulted in hyphae, confirming that multivalent epitope presentation—not gel stiffness or free sugar—drives the response. The results show that a single carbohydrate surface can act as a tunable biological cue.

Outlook

This supramolecular system offers molecularly defined, densely glycosylated hydrogels whose epitope identity can be swapped without altering bulk properties. The authors note opportunities in hetero-multivalent display—co-assembling oligomers with different terminal units—for antimicrobial, wound-healing, and tissue-engineering applications. Transcriptomic analysis of C. albicans exposed to these synthetic hydrogels is planned to guide the rational design of anti-virulence materials.

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Reference

1. Hribernik, N., et al. (2026). Supramolecular Carbohydrate Assemblies with Tunable Glycan Surfaces. Angewandte Chemie International Edition. DOI: 10.1002/ange.202515926.