Protein crystalline frameworks with controllable interpenetration directed by dual supramolecular interactions

Area of Science:

• Biomaterials Science
• Protein Engineering
• Nanotechnology

Background:

• Protein crystalline frameworks offer potential for biomimetic and nanotechnological applications due to dense packing and uniform orientation.
• Challenges exist in controlling the formation and precise structure of protein crystalline frameworks.

Purpose of the Study:

• To develop novel protein crystalline frameworks with controllable interpenetration.
• To investigate the self-assembly process and structural characteristics of these frameworks.

Main Methods:

• Utilizing the homotetrameric lectin concanavalin A crosslinked by ligands with monosaccharide and rhodamine (RhB) groups.
• Employing dual non-covalent interactions: sugar-lectin binding and RhB dimerization.
• Characterizing the 3D structure using X-ray crystallography and investigating kinetics and mechanism.

Main Results:

• Achieved controllable interpenetrating or non-interpenetrating protein crystalline frameworks by varying the spacer length of the inducing ligand.
• Demonstrated that carbohydrate-protein binding precedes RhB dimerization in the self-assembly process.
• Obtained rapid crystallization with high yield, especially with an excess of inducing ligand.

Conclusions:

• Successfully developed a fast and versatile method for protein crystalline framework preparation using dual non-covalent interactions.
• The ability to control framework interpenetration opens new avenues for protein crystallization.
• This approach may significantly impact future protein crystallization techniques and applications.