A Self-Cross-Linked Dual-Enzyme Assembly for Safe and Efficient Hyperuricemia Therapy.

Area of Science:

• Biochemistry
• Enzyme Engineering
• Biotechnology

Background:

• Hyperuricemia, linked to gout and kidney issues, involves purine metabolism disorders.
• Current urate oxidase (UOX) therapy faces safety limits due to hydrogen peroxide (H2O2)-induced oxidative stress.
• Developing strategies to mitigate H2O2 generation is crucial for effective UOX therapy.

Purpose of the Study:

• To engineer a modular enzyme assembly for hyperuricemia treatment.
• To colocalize urate oxidase (UOX) and catalase (CAT) to neutralize H2O2.
• To enhance therapeutic synergy and minimize oxidative side effects of UOX therapy.

Main Methods:

• Designed engineered coiled-coil motifs for modular enzyme assembly.
• Incorporated site-specific cysteine residues for disulfide-stabilized heterodimerization.
• Fused motifs to UOX and CAT for spontaneous, stable enzyme complex formation without chemical conjugation.

Main Results:

• Validated binding specificity and affinity of coiled-coil motifs using fluorescence assays.
• Achieved spontaneous and stable assembly of a functional UOX-CAT enzyme complex.
• Demonstrated high catalytic efficiency and significantly reduced reactive oxygen species (ROS)-mediated cytotoxicity in cell models.

Conclusions:

• Developed a tunable strategy for dual-enzyme assembly to treat hyperuricemia.
• Successfully minimized oxidative side effects associated with UOX therapy.
• The UOX-CAT complex shows promise for enhanced therapeutic outcomes in hyperuricemia management.