Design and Construction of Functional Supramolecular Metalloprotein Assemblies

Area of Science:

• Bioinorganic Chemistry
• Protein Engineering
• Supramolecular Chemistry

Background:

• Metalloproteins are crucial for essential biochemical transformations, utilizing a limited set of metal ions within protein scaffolds.
• Understanding the interplay between metal ions and protein structures is key to deciphering metalloprotein function.
• Constructing functional metalloproteins from scratch remains a significant challenge in bioinorganic chemistry.

Purpose of the Study:

• To develop a novel strategy for engineering complex metalloproteins using metal-mediated self-assembly and interface redesign.
• To build functional supramolecular protein assemblies capable of selective metal binding and catalysis.
• To create metalloprotein systems that respond to external stimuli through allosteric effects.

Main Methods:

• Metal-Directed Protein Self-Assembly (MDPSA) using folded proteins as ligands.
• Metal Templated Interface Redesign (MeTIR) to stabilize and functionalize protein superstructures.
• Utilizing cytochrome cb562 (cyt cb562) as a model building block for a tetrameric complex (Zn4:M14).

Main Results:

• Demonstrated proof-of-principle for MDPSA and MeTIR using the cyt cb562 model system.
• Stabilized a tetrameric Zn-directed cyt cb562 complex (Zn4:M14) via computationally designed noncovalent interactions.
• Advanced the engineered metalloprotein scaffold towards self-standing assemblies with reactive metal centers and allosteric control.

Conclusions:

• The MDPSA and MeTIR strategy offers a powerful approach for de novo metalloprotein construction.
• Engineered protein assemblies can be designed for stable metal ion binding and selective reactivity.
• This work paves the way for creating sophisticated metalloproteins with tunable functions and stimuli-responsive properties.