High mannose N-glycan oxazoline: the key building block of enzymatic glycoprotein synthesis 904690-14-8

In the field of glycoscience and glycoengineering, accurately and efficiently constructing complex sugar chain structures is one of the core challenges in developing a new generation of biotherapeutics. Glycan Oxazoline with a specific structure, as a highly active donor substrate for enzymatic glycosylation, has become a key tool to achieve this goal. Among them, a high-mannose N-glycan oxazoline with a well-defined structure provides researchers with the powerful ability to directly control the glycosylation modification of glycoproteins.

Chemical Information

Chemical name: 2-methyl-[α-D-mannopyranosyl-(1->3)-[α-D-mannopyranosyl-(1->6)-]-α-D-mannopzranoszl-(1->6)-[α -D-mannopyranosyl-(1->3)-]-β-D-mannopyranosyl-(1->4)-1,2-dideoxy-α-D-glucopyrano]-[2,1-d]-oxazoline

Common name: High mannose type N-glycan oxazoline donor (Man9GlcNAc oxazoline)

Chemical formula: C38H63NO30

Molecular weight: 1013.90 g/mol

CAS number: 904690-14-8

Category: Glycan Oxazoline

Structural features

This molecule is a structurally precise oligosaccharide oxazoline derivative. Its unique features are:

Active oxazoline ring: The five-membered oxazoline ring structure at the end of the molecule is the core of its high reactivity. This ring is formed by the C1 and C2 positions of the sugar moiety and a methyl-substituted amino group. As a specific substrate for glycosyltransferases (especially endoglycosidases and their mutants), it can achieve efficient and site-specific transfer of sugar chains.

Clear high-mannose backbone: Its sugar chain part is a classic high-mannose nonose (Man9) structure, connected through specific α-1,3, α-1,6 and β-1,4 glycosidic bonds. This structure is highly consistent with the common N-linked glycan core found on eukaryotic glycoproteins and has good biological relevance.

Stable chemical bonds: The C-N bond of the oxazoline ring is relatively stable under specific conditions, making it easy to store and operate, and it can be efficiently activated at the enzyme active center, achieving a balance between stability and reactivity.

Main applications and advantages

Core raw materials for enzymatic glycoprotein synthesis and engineering

In the chemoenzymatic synthesis of glycoproteins, this oxazoline molecule can serve as a perfect donor substrate for endoglycosidase (Endo) or glycoside synthase (Glycosynthase). Through an enzymatic reaction, the entire high mannose chain can be transferred to the Fc segment glycosylation site (Asn297) of a specific glycoprotein (such as an antibody) or the sugar recognition sequence of a specific peptide chain in one step and at a specific location. This method overcomes the problems of cumbersome steps and poor selectivity of traditional chemical glycosylation, and is the core technical path to achieve uniform and customized glycoprotein production.

The cornerstone of uniform production of glycoprotein drugs

The efficacy of therapeutic monoclonal antibodies, such as antibody-dependent cell-mediated cytotoxicity (ADCC) and complement-dependent cytotoxicity (CDC), is strongly dependent on the composition of N-glycans in their Fc region. Using this well-defined oxazoline donor, natural or modified high-mannose chains can be reinstalled onto deglycosylated antibodies through enzymatic transglycosylation reactions, thereby obtaining antibody drugs with uniform glycoforms and controllable activity. This provides the possibility to develop next-generation biosimilars or bioimprovements with better efficacy and higher batch-to-batch consistency.

Tool molecules for basic research on glycobiology

As a structurally well-defined substrate, this molecule is an ideal probe for studying the enzymatic mechanism, catalytic specificity and kinetic parameters of the endoglycosidase family. At the same time, it can be used to construct various glycoproteins or glycoconjugates carrying high mannose chains to study the specific functions of sugar chains in protein folding, stability, immune recognition and cell signal transduction, such as the study of interactions with mannose receptors (MR) on dendritic cells.

Conclusion

This high-mannose N-glycan oxazoline is much more than a complex sugar compound. It represents a key leap in glycoscience from analytical understanding to precise synthesis and application. As an "active building block" in enzymatic glycosylation technology, it opens the door to drawing precise maps of glycoprotein structure and function and creating a new generation of therapeutic proteins with customized sugar chain modifications (including antibodies, fusion proteins, enzyme replacement therapy drugs, etc.). It is an indispensable molecular bridge connecting chemical synthesis and biological functions.

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