Equilibrium Studies of Designed Metalloproteins

Area of Science:

• Biochemistry
• Computational Biology
• Structural Biology

Background:

• Thermodynamic descriptions of cofactor-protein interactions are vital for evaluating designed metalloproteins.
• Limited data on metal-protein interaction thermodynamics hinders computational metalloprotein design, unlike protein-protein interactions.
• Decades of protein-protein interaction studies have advanced computational design of novel protein folds and enzymes.

Purpose of the Study:

• To provide a robust basis for computational metalloprotein design by evaluating metal-protein interaction thermodynamics.
• To offer detailed insights into the assembly and stability of designed metalloproteins.
• To parse free energy contributions in hemeproteins and reveal proton-coupled electron transfer mechanisms.

Main Methods:

• Equilibrium binding studies
• Protein unfolding free energy determinations
• Proton competition equilibria
• Electrochemistry

Main Results:

• Detailed thermodynamic measurements offer insights into metalloprotein assembly and stability.
• The studies allow for separation of metal-ligand and porphyrin-protein free energy contributions in hemeproteins.
• Mechanisms of proton-coupled electron transfer in metalloproteins can be elucidated.

Conclusions:

• Detailed thermodynamic characterization is essential for advancing computational metalloprotein design.
• Understanding the interplay of equilibria is key to metalloprotein assembly and stability.
• These measurements provide critical data for the rational design of functional metalloproteins.