Ac4GlcNAl: Click chemistry probe to decipher sugar metabolism 1361993-37-4

Ac4GlcNAl (1,3,4,6-tetra-O-acetyl-2-[(1-pentynyl)amino]-2-deoxy-D-glucose) is an engineered metabolic sugar probe centered on the integration of bioorthogonal chemistry for alkynyl labeling. As an analog and precursor of N-acetylglucosamine (GlcNAc), this molecule enables researchers to visualize, track and analyze complex glycosylation processes in cells with high specificity and sensitivity, providing a powerful chemical tool for glycobiology research.

Chemical Information

Chemical name: 1,3,4,6-Tetra-O-acetyl-2-[(1-pentynoyl)amino]-2-deoxy-D-glucose

Common name: Alkynyl labeled glucose (Ac4GlcNAl)

Chemical formula: C19H25NO10

Molecular weight: 427.4 g/mol

CAS number: 1361993-37-4

Category: Metabolic Probe Reagents

Structural features

The structure of Ac4GlcNAl has been carefully designed to optimize its cell permeability and metabolic labeling functions:

Acetyl protection: The four acetyl groups (Ac) in the molecule are key solubilizing and protecting groups. They greatly enhance the hydrophobic compound's ability to penetrate cell membranes. Once it enters the cell, non-specific cytoplasmic esterases will hydrolyze it, remove its acetyl group, and release the active alkynyl-labeled amine sugar (GlcNAl), so that it can be utilized by the intracellular sugar metabolism pathway.

Alkynyl labeled handle: Unlike traditional GlcNAc molecules, a pentynyl group is connected to the 2-position amino group. The terminal alkynyl group (-C≡CH) constitutes a compact and efficient bioorthogonal reactive group. This group is highly stable and inert in normal biological environments, but can be specifically and rapidly covalently linked to reporter molecules carrying azide groups (such as fluorescent dyes, biotin or magnetic beads) through copper-catalyzed azide-alkyne cycloaddition reactions to achieve signal amplification and detection.

Main applications and advantages

Core tools for cell glycan labeling and imaging

Ac4GlcNA1 can be taken up by cells and metabolized into the glycan chains of glycoproteins and glycolipids, especially O-GlcNAc modifications and mucin-type O-glycan chains on the cell surface. Through subsequent click chemical reactions with azide fluorescent dyes, high-resolution fluorescence imaging of newly synthesized glycans in living or fixed cells can be performed to intuitively reveal changes in their subcellular localization and distribution.

Achieving dual-mode enrichment and identification of glycoproteomes

This probe provides a key technical means for functional glycoproteomics research. After metabolic incorporation, click reactions with azide-biotin can be used for affinity purification and enrichment of alkynyl-labeled glycoproteins or glycopeptides. Combined with mass spectrometry analysis, glycosylated proteins that undergo dynamic changes under specific physiological or pathological states can be systematically identified and quantified, revealing new biomarkers or drug targets.

Dynamic tracking of glucose metabolism fluxes and pathways

As a competitive substrate analog, Ac4GlcNAl can participate in key sugar metabolism processes such as the hexosamine biosynthetic pathway. By designing pulse-chase experiments and combining them with flow cytometry or in-gel fluorescence detection, the dynamic flux and rate of glucose metabolism and its changes in response to cell signals, nutritional status or inhibitors can be quantitatively analyzed, providing dynamic data for metabolic regulation research.

Study the function of O-GlcNAc glycosylation modification

O-GlcNAc modification is an important protein post-translational modification, involved in regulating various processes such as transcription, signal transduction, and cellular stress. Ac4GlcNAl is a commonly used probe for studying this modification. It can efficiently label O-GlcNAc-modified proteins and help analyze their specific mechanisms in the cell cycle, development and differentiation, and the occurrence and development of diseases (such as cancer and neurodegenerative diseases).

Conclusion

Ac4GlcNAl combines metabolic labeling with click chemistry to successfully transform complex glycobiological problems into chemical problems that can be resolved by conventional techniques such as fluorescence and mass spectrometry. It transcends the limitations of traditional static observations and allows researchers to dynamically and specifically explore the mysteries of glycosylation in a living cell environment. From basic cell signaling research to exploration of disease mechanisms, this chemical probe continues to push the boundaries of glycoscience and serves as a bridge between chemical tools and the understanding of living systems.

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