Multivalent hydrazide-functionalized magnetic nanoparticles for glycopeptide enrichment and identification

Area of Science:

• Proteomics and Glycoscience
• Biomaterials and Nanotechnology

Background:

• Hydrazide chemistry is a common method for glycopeptide enrichment.
• Conventional materials have limited surface area, restricting hydrazide group immobilization and reaction rates.
• Glycosylation microheterogeneities further challenge glycopeptide enrichment.

Purpose of the Study:

• To develop a novel functionalized magnetic nanoparticle with multivalent hydrazide groups for improved glycopeptide enrichment.
• To enhance the sensitivity, selectivity, and capacity of glycopeptide capture from complex biological samples.

Main Methods:

• Synthesis of hydrazide-modified non-crosslinked polymer chains on magnetic nanoparticles using surface-initiated atom transfer radical polymerization (SI-ATRP).
• Characterization of nanoparticle surface properties and hydrazide group density.
• Application of nanoparticles for glycopeptide enrichment from fetuin and mouse liver tissue digests.

Main Results:

• The novel nanoparticles exhibited a three-fold higher density of hydrazide groups compared to conventional materials.
• Highly sensitive and selective enrichment of glycopeptides was achieved, even from a 100-fold excess of non-glycosylated proteins.
• A glycopeptide recovery ratio of 77.8% and a binding capacity of 25 μg mg⁻¹ were determined.
• Enrichment from mouse liver tissues identified 511 unique glycopeptides from 372 glycoproteins.

Conclusions:

• The multivalent hydrazide-functionalized magnetic nanoparticles represent a significant advancement in glycopeptide enrichment technology.
• These nanoparticles offer superior performance for analyzing complex proteomics samples, particularly for N-linked glycopeptides.
• The developed method holds great potential for advancing glycoscience research and biomarker discovery.