Self-Assembled Multienzyme Nanostructures on Synthetic Protein Scaffolds

Area of Science:

• Biochemistry
• Synthetic Biology
• Nanotechnology

Background:

• Cellular enzymes often self-assemble into multienzyme complexes to enhance efficiency and product yield.
• Natural enzyme nanomachines inspire the creation of synthetic systems for improved biosynthesis.
• SpyCatcher and SpyTag protein ligation is a powerful tool for protein complex assembly.

Purpose of the Study:

• To develop a versatile self-assembly strategy for constructing synthetic multienzyme nanostructures.
• To investigate the impact of different scaffold architectures on enzyme cascade efficiency.
• To explore the mechanisms underlying rate enhancement in scaffolded enzyme systems.

Main Methods:

• Utilized SpyCatcher and SpyTag protein ligation to create two types of synthetic protein scaffolds: cross-linked heterogeneous and homogeneous cyclic.
• Assembled sequential enzymes from the menaquinone biosynthetic pathway onto these scaffolds using polyketide synthase docking domains.
• Characterized the resulting nanostructures and evaluated their performance in cascade catalytic reactions.

Main Results:

• Both scaffolded multienzyme assemblies significantly increased the product yield in menaquinone biosynthesis.
• The cross-linked scaffold enhanced reaction rates by streamlining reactant flow.
• The cyclic scaffold accelerated catalytic efficiency, particularly for the rate-limiting enzyme.

Conclusions:

• Self-assembly of enzymes using SpyCatcher/SpyTag and docking domain interactions creates novel protein nanostructures with enhanced catalytic activity.
• Different scaffold architectures can lead to distinct mechanisms for rate enhancement in enzymatic cascades.
• This strategy offers a versatile approach to developing powerful biocatalysts for efficient bioconversion.