Efficient Separation of Nucleic Acids with Different Secondary Structures by Metal-Organic Frameworks

Area of Science:

• Materials Science
• Biochemistry
• Nanotechnology

Background:

• Selective separation of nucleic acids (DNA and RNA) is crucial for genomic applications.
• Existing methods often rely on specific binding agents, limiting their scope and scalability.
• Understanding nucleic acid secondary structures is key to their function and analysis.

Purpose of the Study:

• To develop a novel method for selective nucleic acid separation using metal-organic frameworks (MOFs).
• To investigate the influence of MOF pore environments on nucleic acid inclusion based on structural features.
• To establish selection rules for separating nucleic acids with varying secondary structures.

Main Methods:

• Utilized three distinct MOFs (Co-IRMOF-74-II, -III, -IV) with controlled pore environments.
• Studied the inclusion of nucleic acids into MOF pores from solution.
• Employed circular dichroism (CD) spectroscopy to monitor the conformational changes of nucleic acids.
• Identified key selection factors: steric hindrance, conformational stability, and molecular weight.

Main Results:

• Demonstrated the spontaneous inclusion of nucleic acids into MOFs, transitioning from disordered to ordered states.
• Established that MOFs can selectively separate nucleic acids based on size, shape, length, and conformational flexibility.
• Successfully extracted nucleic acids with unstable secondary structures from complex mixtures, leaving stable structures behind.
• Showcased the MOF method's ability to handle diverse and large quantities of nucleic acids without specific binding agents.

Conclusions:

• Metal-organic frameworks provide a versatile platform for selective nucleic acid separation based on structural properties.
• This MOF-based approach enables bulk enrichment and analysis of nucleic acids, valuable for genome-wide structural studies.
• The method has potential applications in assessing biomolecular folding stability and analyzing complex nucleic acid mixtures.