The structural complexity of glycans is a primary driver of biological diversity, yet this very complexity presents a significant hurdle for drug discovery and therapeutic optimization. CD BioGlyco bridges this gap through our chemical synthesis-based glycan modification service. While biosynthetic pathways provide the foundation, chemical synthesis offers the surgical precision required to introduce non-natural modifications, site-specific labels, and bio-orthogonal handles that are inaccessible through biology alone. Our service is a specialized pillar of our synthetic biology-based glycan modification platform, designed to empower researchers in fine-tuning glycan-protein interactions, enhancing metabolic stability, and developing targeted delivery systems. By integrating advanced organic chemistry with glycoscience expertise, CD BioGlyco enables the creation of high-purity, tailor-made glycan derivatives for the most demanding biopharmaceutical applications.
Core Technologies
We utilize an array of high-end chemical strategies to achieve site-specific glycan tailoring:
Regioselective Protecting Group Strategies
Employing orthogonally removable groups to expose specific hydroxyl positions, allowing for precise modification of complex oligosaccharide backbones.
Bio-orthogonal Click Chemistry
Integration of azide, alkyne, or trans-cyclooctene handles into glycan structures for high-efficiency labeling or conjugation in biological environments.
Chemoenzymatic Remodeling
A hybrid approach using chemical synthesis to create specialized donor substrates, which are then transferred to glycan acceptors via engineered glycosyltransferases.
Fluorination and Isosteric Replacement
Substituting hydroxyl groups with fluorine or other bioisosteres to modulate the electronic properties and metabolic half-life of glyco-conjugates.
Solid-Phase Carbohydrate Synthesis (SPCS)
Automated platforms for the rapid assembly of modified glycan chains with high reproducibility and purity.
Engineering the Next Generation of Glycan Therapeutics through Chemical Precision.
Our service scope for chemical glycan modification is designed to address the "missing pieces" in glycan research. We specialize in the site-specific introduction of post-glycosylational modifications (PGMs), such as sulfation and phosphorylation, which are often heterogeneously distributed in natural samples. By synthesizing these variants chemically, we provide researchers with defined, homogenous standards to study their exact biological roles. Furthermore, we offer non-natural glycan derivatives, including deoxygenated, fluorinated, or methylated analogs, which are essential for mapping the binding epitopes of glycan-binding proteins (GBPs) and galectins.
We also provide extensive glycan-conjugation services, where modified glycans are coupled to lipids, peptides, or synthetic polymers to create glycomimetics with enhanced pharmacological properties. This includes the development of PROTAC-glycan hybrids and antibody-sugar conjugates (ASCs). For imaging applications, we offer the synthesis of fluorescently tagged or biotinylated glycans with diverse linker lengths to minimize steric hindrance during assays. Our capabilities extend from milligram-scale synthesis for initial screening to gram-scale production for preclinical studies, ensuring a seamless pipeline from concept to lead optimization. Whether you are developing a glycan-based vaccine adjuvant or a specific enzyme inhibitor, our chemical modification platform provides the molecular tools necessary to overcome the limitations of natural glyco-structures.
Workflow
Structural Design & Retrosynthetic Analysis
Our team of experienced medicinal chemists works closely with you to define and refine the target glycan modification. We conduct a detailed retrosynthetic analysis, evaluating potential synthetic pathways to identify the most efficient and scalable route. This includes assessing protecting group strategies, stereochemical control, and functional group compatibility to minimize steps and maximize yield.
Building Block Preparation
We provide end-to-end support in acquiring the essential monosaccharide building blocks. Whether through in-house synthesis or sourcing from trusted suppliers, we ensure each building block is of high purity and appropriately functionalized with protecting groups (e.g., acetyl, benzyl, TBDMS) and reactive handles (e.g., azido, alkynyl, amino) tailored to your modification needs.
Stepwise Chemical Assembly
Using optimized liquid-phase or solid-phase synthesis approaches, we systematically assemble the glycan chain. Modifications such as sulfation, phosphorylation, or site-specific alkylation are introduced with precise regiocontrol. Our protocols emphasize high coupling efficiency, minimal side reactions, and compatibility with sensitive functional groups.
Global Deprotection & Purification
After assembly, global deprotection is carried out under carefully controlled, mild conditions to preserve the integrity of the modified glycan. The crude product is then subjected to advanced multidimensional purification, including reversed-phase high-performance liquid chromatography (RP-HPLC) and hydrophilic interaction liquid chromatography (HILIC), to achieve a purity level exceeding 95%.
Structural Verification
Each modified glycan undergoes rigorous analytical characterization. We employ high-resolution mass spectrometry (HRMS) for accurate mass confirmation, along with a full suite of 1D and 2D NMR experiments, including COSY, HSQC, and HMBC, to unambiguously verify regiochemistry, anomeric configuration, glycosidic linkages, and modification sites.
Functional Validation (Optional)
To support your research goals, we offer optional preliminary bioactivity screening. This can include surface plasmon resonance (SPR) or bio-layer interferometry (BLI) assays to evaluate binding affinity and confirm that the introduced modification produces the intended biological effect.
Publication Data
Journal: Frontiers in Chemistry
DOI: 10.3389/fchem.2022.880128
IF: 4.2
Published: 2022
Results: This review article comprehensively summarizes recent advances in synthesizing complex-type N-glycans, which are crucial for protein function in humans. The authors systematically outline two primary methodological approaches: chemical strategies and chemoenzymatic strategies. Chemically, the focus is on overcoming key challenges like achieving stereoselective glycosylations, specifically β-mannosylation for the core structure and α-sialylation at the termini. For assembly, methods such as linear, convergent, automated solid-phase, and microfluidic syntheses are discussed. Alternatively, chemoenzymatic strategies combine chemical synthesis with enzymatic precision, detailing various frameworks including the "top-down" degradation of large precursors, enzymatic elongation from small glycans using glycosyltransferases, and the use of endo-type enzymes and oligosaccharyltransferases (OST). Approaches starting from natural resources like sialylglycopeptide (SGP) are also covered. The review concludes that while significant progress has been made in preparing these structurally intricate molecules for biomedical applications, further work is needed to develop more efficient and universal synthetic methods.
Applications
Glycan-Based Vaccine Development
We support the rational design and synthesis of fully synthetic carbohydrate vaccines. Our services include the chemical synthesis of modified tumor-associated carbohydrate antigens (TACAs), such as Globo-H, GM2, or TF antigens, with tailored adjuvanticity. These antigens are site-specifically conjugated to immunogenic carrier proteins (e.g., CRM197, KLH, or TT) via optimized linkers to enhance both immunogenicity and in vivo stability, enabling the development of precise, next-generation anticancer or antimicrobial vaccine candidates.
Targeted Drug Delivery Systems
We engineer advanced, glycan-functionalized nanocarriers for tissue-specific drug delivery. By decorating the surface of nanoparticles, liposomes, or polymeric micelles with high-affinity glycan ligands (e.g., galactose or N-acetylgalactosamine), we create delivery vehicles that actively target receptors such as the asialoglycoprotein receptor (ASGPR), highly expressed on hepatocytes. This approach enables liver-directed therapy, improving therapeutic index through enhanced cellular uptake and localized release of encapsulated small molecules, nucleic acids, or proteins.
Precise Epitope Mapping
We employ a chemical "alanine-scan" strategy applied to glycans to map critical binding epitopes. By synthesizing focused libraries in which individual hydroxyl groups are systematically replaced with atoms such as fluorine, which mimics the size and polarity of oxygen while removing hydrogen-bonding capacity, we can pinpoint the exact functional groups essential for carbohydrate-protein recognition. This service provides unambiguous, atomic-level insight into binding interfaces for antibody development, inhibitor design, and mechanistic studies.
Enzyme Inhibitor Discovery
We design and synthesize mechanistically informed glycan-based enzyme inhibitors. This includes the construction of transition-state analogs that mimic the oxocarbenium-ion-like intermediate of glycosidase reactions, as well as the synthesis of mechanism-based (suicide) inhibitors equipped with reactive functional groups (e.g., fluorides, epoxides) for glycosyltransferases and glycosidases. These compounds serve as powerful chemical tools for probing enzyme function and as potential therapeutic leads for metabolic disorders, infectious diseases, and cancer.
Advantages
Surgical Regioselectivity
Our expertise in advanced protecting group chemistry enables the precise, selective modification of a single hydroxyl group within a complex polyol scaffold. By employing orthogonal and temporary protecting group strategies, we achieve absolute structural homogeneity, eliminating regioisomeric mixtures and ensuring that your sample consists of a single, well-defined molecular entity critical for structure-activity relationship studies.
Access to Non-Natural Chemical Space
We specialize in the chemical synthesis of glycan analogs that are inaccessible through enzymatic or biological pathways. This includes the precise incorporation of non-natural elements, such as sulfur, selenium, or fluorine, at specific positions within the carbohydrate scaffold. These synthetic glycans open new frontiers in drug discovery by creating stable glycomimetics with enhanced metabolic stability, altered binding profiles, and novel mechanisms of action.
High Isomeric Purity
Chemical synthesis provides unparalleled control over structural definition, completely circumventing the inherent microheterogeneity of biologically produced glycans. We deliver compounds with exceptional isomeric purity, meeting the stringent "Publication-Quality" standards required for high-resolution structural biology techniques, including X-ray crystallography, cryo-EM, and detailed interaction studies, where molecular uniformity is paramount.
Bio-orthogonal Readiness
Every modified glycan we produce can be custom-fitted with bio-orthogonal functional handles, such as azide, alkyne (including strained alkynes like DBCO), or tetrazine groups. This "plug-and-play" functionality enables seamless conjugation via click chemistry (e.g., SPAAC, CuAAC, or IEDDA) to proteins, surfaces, fluorophores, or other probes, facilitating direct integration into your proteomic profiling, cellular imaging, or diagnostic assay workflows without compromising biological integrity.
Frequently Asked Questions
Customer Review
"The fluorinated glycan analogues synthesized by CD BioGlyco were pivotal to the success of our recent galectin-3 binding study. The precise regiochemical control and absolute homogeneity of the materials enabled us to obtain unambiguous structural and thermodynamic data, directly leading to a high-resolution model of the protein-carbohydrate interaction that was accepted without revision."
– Dr. S.M., Senior Investigator, Chemical Biology Lab
"For our novel antibody-drug conjugate (ADC) program, CD BioGlyco designed and delivered a custom, site-specifically functionalized glycan-linker construct. Their team not only mastered the intricate chemistry but also seamlessly scaled the synthesis from milligram to multigram quantities while consistently maintaining >98% purity. This reliability was a critical enabler for our downstream process development and preclinical testing timeline."
– Manager, Bioconjugation Department, Biotech
"CD BioGlyco combines profound synthetic creativity with rigorous execution. When our project required a complex, multivalent glycomimetic inhibitor with unnatural linkages and modifications, several other CROs declined, citing synthetic intractability. The CD BioGlyco team developed a novel route, solved the significant purification challenges, and delivered the target compound with full analytical characterization. Their technical depth is exceptional."
– Director of R&D, Glycomedicine Division, Pharma
Associated Services
Building upon our expertise in chemical synthesis-based glycan modification service, which enables the precise and controlled alteration of carbohydrate structures, we have developed specialized capabilities in producing highly defined, complex sugars. This allows us to offer a focused HMO Production Service for the synthesis of key human milk oligosaccharides, including 2'-FL production, 3'-FL production, and DFL production, to support nutritional and biomedical research.
CD BioGlyco is your partner in navigating the complexities of glycan engineering. If you are interested in our Synthetic Biology-based Glycan Modification Service, contact us. Our service provides the precision and flexibility required to turn glycan-related challenges into therapeutic opportunities.
Reference
Zhao, X.; et al. Recent chemical and chemoenzymatic strategies to complex-type N-glycans. Frontiers in Chemistry. 2022, 10, 880128. (Open Access)
For research use only. Not intended for any clinical use.
