Tuning Chemoenzymatic Pd/Laccase Conformation Toward Optimized Heterogeneous Aerobic Oxidation

Area of Science:

• Catalysis
• Biochemistry
• Materials Science

Background:

• Development of efficient heterogeneous catalysts is crucial for sustainable chemical synthesis.
• Chemoenzymatic systems offer unique advantages by combining enzymatic selectivity with metal catalysis.
• Controlling the spatial arrangement of catalytic components is key to enhancing performance.

Purpose of the Study:

• To investigate the impact of spatial organization of laccase and palladium on catalytic efficiency.
• To identify key structural features that enhance the performance of chemoenzymatic catalysts.
• To optimize veratryl alcohol oxidation using heterogeneous chemoenzymatic catalysts in a continuous flow system.

Main Methods:

• Synthesis of heterogeneous chemoenzymatic catalysts by confining laccase and palladium units into silica foams.
• Testing catalyst performance in veratryl alcohol oxidation under continuous flow conditions.
• Analyzing the correlation between enzyme-surface interactions and catalytic activity.

Main Results:

• Catalytic efficiency was significantly enhanced by specific spatial organization of laccase and palladium.
• The presence of surface-located lysine near the laccase T1 oxidation site was critical for improved performance.
• Optimized hybrid catalysts demonstrated superior activity in veratryl alcohol oxidation.

Conclusions:

• Spatial arrangement and enzyme-metal proximity are critical factors in chemoenzymatic catalysis.
• Surface-exposed amino acid residues, like lysine, can play a significant role in catalyst enhancement.
• These findings provide insights for designing next-generation chemoenzymatic catalysts for oxidation reactions.