Controlling the Crystal Growth of DNA Molecules via Strategic Chemical Modifications

Area of Science:

• Biochemistry
• Materials Science
• Crystallography

Background:

• Intermolecular interactions are crucial for biomolecular crystallization.
• Precise control over biomolecular crystal growth remains a challenge.

Purpose of the Study:

• To investigate the relationship between intermolecular interaction strength and DNA crystal growth kinetics.
• To explore DNA modifications as a strategy for controlling crystal formation.

Main Methods:

• Utilized DNA triangular crystals and modified variants.
• Introduced 2 -O-methylation and phosphorothioate modifications at sticky ends.
• Observed crystallization kinetics and crystal morphology.

Main Results:

• 2 -O-methylation strengthened intermolecular interactions, accelerating the formation of smaller DNA crystals.
• Phosphorothioate modification weakened interactions, delaying nucleation and yielding fewer, larger crystals.
• These effects were consistent across DNA triangles and a DNA decamer.

Conclusions:

• The strength of intermolecular interactions directly influences DNA crystal growth.
• DNA modifications like 2 -O-methylation and phosphorothioate offer rational strategies for controlling DNA crystal size and formation.
• This control facilitates structural determination of biomolecules.