Structure of 3-isoinosine

Area of Science:

• Crystallography
• Structural Biology
• Biochemistry

Background:

• Nucleosides are fundamental building blocks of nucleic acids.
• Understanding the three-dimensional structure of nucleoside analogs is crucial for drug design and molecular biology.
• 3-beta-D-Ribofuranosylhypoxanthine is a modified nucleoside with potential biological relevance.

Purpose of the Study:

• To elucidate the crystal structure of 3-beta-D-Ribofuranosylhypoxanthine.
• To characterize the tautomeric form, molecular geometry, and intermolecular interactions of the compound.
• To provide detailed crystallographic data for this specific nucleoside.

Main Methods:

• Single-crystal X-ray diffraction analysis was performed.
• The crystal structure was solved and refined using Mo K alpha radiation.
• Crystallographic data including unit cell parameters, space group, and atomic coordinates were determined.

Main Results:

• The crystal structure revealed two crystallographically independent molecules of 3-beta-D-Ribofuranosylhypoxanthine.
• The predominant tautomeric form observed was the 6-oxo, 7H form.
• Extensive three-dimensional hydrogen bonding was observed involving most nitrogen and oxygen atoms, excluding N(3) and O(4').
• The hypoxanthine moiety was found to be nearly planar, with glycosidic linkage torsional angles in the anti range.
• Two distinct sugar puckers, 4T3 and 2E, were identified in the two independent molecules.

Conclusions:

• The study provides a detailed crystallographic description of 3-beta-D-Ribofuranosylhypoxanthine.
• The observed tautomeric form and hydrogen bonding network offer insights into molecular recognition and crystal packing.
• The structural data contribute to the understanding of nucleoside conformation and variability.