The nucleoside uridine isolated in the gas phase

Area of Science:

• Molecular biology
• Physical chemistry
• Biophysics

Background:

• Nucleosides like uridine are fundamental building blocks of RNA.
• Understanding nucleoside structure is crucial for molecular biology and drug design.
• Previous studies often relied on computational methods or solution-state analysis.

Purpose of the Study:

• To experimentally observe and characterize isolated uridine in the gas phase.
• To determine the most stable conformation of uridine without environmental influences.
• To investigate the role of intramolecular hydrogen bonds in nucleoside stabilization.

Main Methods:

• Laser ablation was used to introduce uridine into the gas phase.
• Fourier transform (FT) microwave spectroscopy was employed for characterization.
• Analysis focused on identifying the specific molecular conformation and bonding.

Main Results:

• The study provides the first experimental observation of isolated uridine in the gas phase.
• The anti/C2'-endo-g+ conformation was identified as the most stable form of uridine.
• Intramolecular hydrogen bonds between the uracil and ribose components were confirmed as key stabilizing factors.

Conclusions:

• Gas-phase isolation allows for the study of intrinsic nucleoside properties.
• The anti/C2'-endo-g+ conformation is the predominant and most stable form of free uridine.
• Intramolecular hydrogen bonding is critical for stabilizing uridine's structure in isolation.