3'-SLN: A precision glycan key for glycobiology research CAS 81693-22-3

In the microscopic world of life sciences, sugar molecules are far more than a source of energy - they are the "language" of cell communication, the "portal" for pathogen invasion, and the "key target" for immune recognition and disease treatment. Among the many sugar structures with different functions, 3'-α-sialo-N-acetyllactosamine stands out and has become a crucial and indispensable precision tool molecule in the fields of glycobiology, immunology and drug research and development. It not only represents the core structural unit of complex sugar chains on the cell surface, but also serves as a bridge between basic discovery and translational medicine.

Chemical Information

Chemical name: 3'-α-sialic acid-N-acetyllactosamine sodium salt

Common name/abbreviation: 3'-SLN; Neu5Acα2-3Galβ1-4GlcNAc (sodium salt form)

English name: 3'-N-Acetylneuraminyl-N-acetyllactosamine Sodium Salt

Chemical formula: C₂₅H₄₂N₂O₁₉

Molecular weight: 674.6 g/mol (free acid form), sodium salt form increases accordingly

CAS number: 81693-22-3

Structural characteristics and biological significance

3'-α-Sialyl-N-acetyllactosamine is a trisaccharide compound with a clear and uniform structure. Its core structure consists of three parts:

Terminal sialic acid (N-acetylneuraminic acid, Neu5Ac): connected by α-2,3 glycosidic bonds, it is the "cap" structure of the sugar chain. Sialic acid is usually located on the outermost side of the sugar chain, and its negative charge gives the cell surface negativity. It is a key site that mediates cell-to-cell repulsion, recognition, and binding to many pathogens (such as influenza viruses and coronaviruses).

Intermediate galactose (Gal): serves as the linking unit.

Terminal N-acetylglucosamine (GlcNAc): It is a common core structural unit in N-linked and O-linked sugar chains.

Its unique structure determines extraordinary biological functions:

Core motif for receptor recognition: This structure is the classic receptor for the hemagglutinin protein (HA) of many animal viruses (such as human influenza virus and avian influenza virus). The virus specifically recognizes and binds to such sialic acid-containing sugar chains on the cell surface through its HA protein, thereby initiating infection.

The hub of cell signaling and immune regulation: As a ligand for many lectins (such as Siglec family immune regulatory receptors and selectins), it participates in inflammatory responses, immune cell trafficking and tumor immune surveillance.

The gold standard for studying the structure and function of sugar chains: As a highly conserved and functionally defined fragment in complex sugar chains, it is an ideal substrate and reference material for studying glycosyltransferase/glycosidase activity, analyzing sugar-protein interaction mechanisms, and developing sugar detection methods.

Main applications and core advantages

1. Key tools for virology and vaccine development

Virus receptor specificity research: Different viruses (such as human influenza and avian influenza viruses) have strict preferences for sialic acid connection types (α2,3 vs α2,6), which directly determines the host range and tissue tropism of the virus. Using highly purified 3'-SLN (type α2,3) and its isomers (such as 6'-SLN, type α2,6), the binding properties and evolutionary trends of viral receptors can be accurately evaluated at the molecular level, providing key data for early warning of influenza pandemics and screening of vaccine strains.

Antiviral drug and vaccine design: A well-defined structure as a viral receptor can be used to screen and evaluate broad-spectrum antiviral drugs (such as sialidase inhibitors), design inhibitors based on receptor blocking strategies, or serve as a hapten for the development of anti-idiotypic antibody vaccines.

2. Precision probes for glycobiology and immunology research

Lectin/receptor binding analysis: It is a standard ligand for studying the binding specificity and affinity of Siglec, Selectin and other important lectin family proteins. It can be used to develop ELISA-like detection, surface plasmon resonance (SPR) analysis, or prepare sugar chips for high-throughput screening of protein-sugar interactions.

A high-quality substrate for enzymatic functional studies: used to measure the activity of sialyltransferase (synthesizing the structure) or sialidase (decomposing the structure). It is a basic tool for studying glycosylation regulation and developing enzyme inhibitors (such as tumor metastasis-related enzyme inhibitors).

Cell surface sugar profile analysis reference material: As a standard in liquid chromatography (HPLC/UPLC) or mass spectrometry (MS) analysis, it is used to qualitatively and quantitatively analyze the expression changes of specific sugar chain structures in cells, tissues or serum. These changes are often closely related to cancer, autoimmune diseases, infections and other disease states.

3. Potential carriers for drug delivery and targeted therapy

Components of targeted delivery systems: Using the specific recognition of this structure by certain pathogens or lectins, it can be connected to liposomes, nanoparticles or drug molecules to construct an intelligent delivery system targeting specific cells (such as liver cells, immune cells, tumor cells).

Development of new biomaterials and diagnostic reagents: By immobilizing them on sensor surfaces or materials, highly specific platforms can be prepared for pathogen capture, rare cell sorting, or disease marker detection.

Conclusion

From understanding the molecular basis of cross-species transmission of influenza viruses, to uncovering the sugar code for immune evasion on the surface of cancer cells, to designing the next generation of targeted biotherapeutics, 3'-α-sialo-N-acetyllactosamine, as a basic module with a clear structure and powerful functions, has always played an indispensable role. It is not only the "key syllable" for decoding the complex sugar language in the life process, but also the "core engine" that drives sugar science from basic research to clinical application.

The above information is provided by the editor of KASONS and is for scientific research only.