1304646-00-1—A core tool for decoding O-GalNAc glycosylation

In the complex world of protein post-translational modifications, O-GalNAc glycosylation (ie, mucin-type O-glycosylation) is one of the key links that endows proteins with functional diversity and fine regulation. It starts from N-acetylgalactosamine connected to serine or threonine residues, and extends from there to a complex sugar chain structure. Among them, the core di-N-acetyllactosamine structure with β(1-6) branches represented by the determined structure of GlcNAcbeta(1-3)[GlcNAc beta(1-6)]GalNAc-alpha-Thr is the core molecular key and cornerstone of this research field.

Chemical Information

Chemical name: GlcNAc beta(1-3)[GlcNAcbeta(1-6)]GalNAc-alpha-Thr

Common name: O-Glycan Core 2 structure-Thr conjugate

Chemical formula: C27H46N4O18

Molecular weight: 714.68 g/mol

CAS number: 1304646-00-1

Category: Glycopeptides

Structural features

This structure is a well-defined glycopeptide unit that is unique in that it accurately reproduces a crucial branch node in the O-GalNAc glycosylation pathway:

l Core 2 branch structure: This molecule starts with GalNAc connected to threonine, and at the same time, an N-acetylglucosamine is connected to the hydroxyl groups at positions 3 and 6 of GalNAc through β-glycosidic bonds. This structure, in which GlcNAc β(1-3) and GlcNAc β(1-6) coexist, constitutes the classic core type 2 O-glycan branch skeleton and is the starting point for many complex extensions and modifications.

l Key node in biosynthesis: The formation of the core 2 branch is catalyzed by a specific β6-N-acetylglucosaminyltransferase. This step has biological switching significance. It converts the linear structure into a branched structure, which greatly expands the potential and diversity of subsequent sugar chain modifications and directly affects the conformation, stability and molecular recognition properties of glycoproteins.

l Determined molecular entity: As a product of chemical synthesis or precise enzymatic customization, this glycopeptide provides a uniform research object with a completely clear structure, eliminating the problem of structural heterogeneity of natural extracts and providing molecular precision for mechanism research.

Main applications and advantages

Gold standard for studying the glycosylation mechanism of O-GalNAc

As a prototype of the core type 2 structure, this molecule is an ideal substrate or inhibitor for studying the enzymatic properties, kinetic parameters and substrate specificity of related glycosyltransferases, such as core 2 β6-GlcNAc transferase. It can also be used to explore how this branched structure affects life processes such as glycoprotein folding, secretion, intracellular localization and degradation.

Functional probes for exploring sugar-protein interactions

Many lectins, antibodies, and cell surface receptors specifically recognize O-glycans containing core 2 branches. This well-defined glycopeptide is a perfect tool to screen, identify and quantify such interactions, and can be used to develop assays based on sugar recognition or to dissect sugar-mediated molecular conversations in infection, immune responses and cell adhesion.

An important building block for complex glycan synthesis and drug development

In synthetic chemistry, this glycopeptide can be used as a core intermediate to efficiently construct more complex and biologically active O-sugar chain structures through further glycosylation, sulfonation, sialylation and other reactions. This provides a key raw material basis for the development of diagnostic reagents, vaccine vectors or therapeutic glycoproteins based on sugar structures.

A bridge between disease biomarker research and drug target validation

The expression level of the core 2 branch structure is closely related to the occurrence and development of tumors, inflammatory diseases, etc. This standard can be used to establish highly sensitive analytical detection methods (such as mass spectrometry standards), accurately quantify the abundance changes of such structures in biological samples, and serve for disease diagnosis or prognosis assessment. It is also a useful tool molecule for validating new therapies targeting this sugar chain synthesis pathway.

Conclusion

From basic biochemistry to translational medicine research, there is a growing need for a deep understanding of O-glycosylation. GlcNAc beta(1-3)[GlcNAc beta(1-6)]GalNAc-alpha-Thr, as a molecular tool with precise structure and clear functions, provides an indispensable starting point and fulcrum for revealing the biosynthetic logic of branched O-glycan chains, decoding its rich biological information, and ultimately harnessing its application potential in disease intervention.

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