CMP-C5-azido-sialic Acid—a new generation of sialic acid nucleotide donor

CMP-C5-azido-sialic acid is a chemically modified sugar nucleotide belonging to the Sugar Nucleotides category. As a functional analog of CMP-sialic acid, a key donor molecule in the cellular sialic acid glycosylation pathway, it provides a powerful tool for precise sugar chain engineering and labeling research by introducing a unique chemical reporter group, and is promoting the cutting-edge development of glycoscience and glycoengineering.

Chemical Information

Chemical name: Cytidine-5‘-monophosphate-5-azidoacetimidosialic acid disodium salt

Common name: CMP-5-azido-sialic acid, CMP-SiaAz

Chemical formula: C20H28N7Na2O16P

Molecular weight: 699.43 g/mol

Category: Sugar Nucleotides

Structural features

The core structural feature of CMP-C5-azido-sialic acid is the precise chemical modification of the sialic acid part of the natural CMP-sialic acid molecule:

C5-specific modification: An azideacetimide group is introduced on the C5 amino group of the sialic acid residue. This modification embeds a highly reactive chemical handle while minimizing interference with the overall molecular conformation of native CMP-sialic acid.

Bioorthogonal reactive group: The introduced azide group (-N3) is a classic functional group in bioorthogonal chemistry. It enables specific and efficient covalent attachment to alkyne-containing probes or carriers via copper-catalyzed or strain-promoted azide-alkyne cycloaddition reactions under physiologically compatible conditions without interfering with other biochemical processes within the cell.

Enzymatic substrate compatibility: Despite modifications, this molecule is designed to retain the basic structural features recognized and utilized by a variety of sialyltransferases, capable of participating as a substrate in enzymatic glycosylation reactions, thereby specifically introducing the azide tag to the end of the sugar chain.

Main applications and advantages

1. Core tools for glycosylation engineering and cell surface marking

CMP-C5-azido-sialic acid can serve as a "Trojan horse" substrate for sialyltransferases in cell surface glycocalyx engineering and site-directed modification of glycoproteins. Its azide-modified sialic acid is integrated into the sugar chain terminus of the target glycoprotein or cell surface through cellular metabolism or in vitro enzymatic reaction. Subsequently, the bioorthogonality of the azide group can be used to specifically connect with fluorescent dyes, biotin, polymers or drug molecules with alkynyl groups to achieve highly selective labeling, imaging, separation or functional modification of specific glycoforms or glycoproteins.

2. Site-specific coupling and functional enhancement of glycoprotein drugs

In the biopharmaceutical field, this molecule provides a new strategy for developing a new generation of antibody-drug conjugates or optimizing therapeutic glycoproteins. Taking advantage of the specificity of glycosyltransferases, azide tags can be precisely introduced into specific glycan sites on glycoproteins. Subsequently, through bioorthogonal reactions, quantitative, fixed-point, and uniform coupling of toxins, small molecule drugs, or immunomodulators on sugar sites can be achieved to avoid the problems of heterogeneity and activity loss caused by traditional random coupling, and help create glycoprotein-coupled drugs with better efficacy and better pharmacokinetic properties.

3. High-end probes for sialic acid biology and disease research

As an innovative tool for studying sialic acid-related biological processes, CMP-C5-azido-sialic acid makes it possible to dynamically and highly sensitively track the synthesis, transport and expression changes of sialic acid on the cell surface. Through labeling and detection, we can deeply explore the role of sialylation in key physiological and pathological processes such as pathogen infection, immune recognition, cell adhesion and tumor metastasis, providing new perspectives and potential diagnostic marker discovery methods for the research of infectious diseases, cancer and immune diseases.

Conclusion

CMP-C5-azido-sialic acid represents a sophisticated result of the intersection of chemical biology and glycoscience. It perfectly combines the substrate specificity of natural enzymes with artificially introduced bioorthogonal reactivity, providing a powerful, precise and highly modular platform molecule for a series of applications ranging from basic glycobiological exploration to high-end glycoprotein drug design and development, empowering innovation in cutting-edge life science research and translational medicine.

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