Self assembling nanoparticle enzyme clusters provide access to substrate channeling in multienzymatic cascades

Area of Science:

• Biocatalysis
• Synthetic Biology
• Nanotechnology

Background:

• Enzymatic cascades are crucial for biocatalysis but often suffer from low efficiency.
• Substrate channeling, where enzymes in a cascade directly pass intermediates, can improve efficiency.
• Developing methods for efficient enzymatic channeling is key for designer biocatalysis.

Purpose of the Study:

• To demonstrate self-assembly of enzymes with nanoparticle scaffolds into nanoclusters for enhanced enzymatic channeling.
• To improve catalytic flux and efficiency in multistep biocatalytic cascades.
• To explore the generalized applicability of this approach for synthetic biology.

Main Methods:

• Utilized saccharification and glycolytic enzymes with quantum dots (QDs) as a model system.
• Prototyped nanoclustered-cascades with 4 to 10 enzymatic steps.
• Employed classical experiments to confirm channeling and numerical simulations to optimize stoichiometry.

Main Results:

• Achieved orders of magnitude improvement in catalytic flux through self-assembled nanoclusters.
• Enhanced channeling efficiency by optimizing stoichiometry, using 2-D nanoplatelets, and ordering enzyme assembly.
• Demonstrated sustained channeled activity for extended cascades by splitting and purifying intermediates.

Conclusions:

• Self-assembled biocatalytic nanoclusters effectively enable substrate channeling and enhance catalytic flux.
• The approach is versatile and applicable to various hard and soft nanoparticles.
• These nanoclusters offer significant benefits for minimalist cell-free synthetic biology.