Multivalent protein binding and precipitation by self-assembling molecules on a DNA pentaplex scaffold

Area of Science:

• Biochemistry
• Molecular Biology
• Supramolecular Chemistry

Background:

• Human C-reactive protein (CRP) is a pentameric protein associated with inflammation and cardiovascular disease.
• Supramolecular assemblies offer unique platforms for molecular recognition and diagnostics.
• Isoguanosine is a non-canonical nucleoside with potential in nucleic acid structures.

Purpose of the Study:

• To engineer a supramolecular assembly capable of specific molecular binding.
• To create a tool for studying the interactions of human C-reactive protein.
• To develop a potential platform for diagnostic applications related to inflammation and heart disease.

Main Methods:

• Synthesis of a supramolecular assembly incorporating an isoguanosine pentaplex.
• Functionalization of the assembly with a "protein-binding" face and a "reporter" face.
• Appended phosphocholine to the "protein-binding" face to facilitate CRP interaction.

Main Results:

• Successfully generated a stable supramolecular assembly with distinct functional faces.
• Demonstrated multivalent binding of the modified assembly to pentameric human C-reactive protein.
• The phosphocholine modification was crucial for high-affinity CRP recognition.

Conclusions:

• The designed isoguanosine pentaplex supramolecular assembly effectively binds human C-reactive protein.
• This system represents a novel approach for targeting CRP, relevant to inflammation and heart disease research.
• The "protein-binding" and "reporter" faces offer versatility for further functionalization and application development.