Investigating the Origin of High Efficiency in Confined Multienzyme Catalysis
Biomimetic strategies have successfully been applied to confine multiple enzymes on scaffolds to obtain higher catalytic efficiency of enzyme cascades than freely distributed enzymes. However, the origin of high efficiency is poorly understood. We developed a coarse-grained, particle-based model to understand the origin of the high efficiency. We found that reaction intermediate is the key in affecting reaction kinetics. In the case of unstable intermediates, the confinement of multienzyme in clusters enhanced the catalytic efficiency and the shorter distance between enzymes resulted in higher reaction rate and yield. This understanding was verified by co-encapsulating multienzyme in metal-organic framework (MOF) nanocrystals as artificially confined multienzyme complexes. The activity enhancement of multienzyme in MOFs depended on the distance between enzymes, when the decay of intermediate existed. The finding of this study is useful for designing in vitro synthetic biology systems based on artificial multienzyme complexes.