Sequence determination in oligosaccharides by relayed NOE experiments in the rotating frame.

Area of Science:

• Carbohydrate chemistry
• Structural biology
• Nuclear Magnetic Resonance spectroscopy

Background:

• Oligosaccharides play crucial roles in biological processes.
• Determining the precise structure of complex oligosaccharides is challenging.
• Understanding oligosaccharide structure is vital for drug discovery and glycobiology.

Purpose of the Study:

• To develop a novel hybrid NMR method for oligosaccharide structural elucidation.
• To enable the determination of both partial and sequential structures of complex oligosaccharides.
• To provide a robust tool for analyzing linear and branched oligosaccharide chains.

Main Methods:

• Utilized a hybrid experimental approach combining 1H-NMR total correlation spectroscopy (TOCSY).
• Integrated rotating frame nuclear Overhauser enhancement spectroscopy (ROESY) into the experimental workflow.
• Applied the combined TOCSY-ROESY method to analyze oligosaccharide structures.

Main Results:

• Successfully determined partial (disaccharide) sequences of oligosaccharides.
• Accurately elucidated the sequential order of monosaccharides within oligosaccharide chains.
• Demonstrated the method's efficacy for both linear and branched oligosaccharide structures.

Conclusions:

• The hybrid 1H-NMR (TOCSY-ROESY) experiment is a powerful tool for oligosaccharide structural analysis.
• This method overcomes limitations in determining complex oligosaccharide sequences and order.
• Provides a significant advancement for the field of glycochemistry and structural biology.