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Related Concept Videos

Catalytically Perfect Enzymes01:07

Catalytically Perfect Enzymes

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The theory of catalytically perfect enzymes was first proposed by W.J. Albery and J. R. Knowles in 1976. These enzymes catalyze biochemical reactions at high-speed. Their catalytic efficiency values range from 108-109 M-1s-1. These enzymes are also called 'diffusion-controlled' as the only rate-limiting step in the catalysis is that of the substrate diffusion into the active site. Examples include triose phosphate isomerase, fumarase, and superoxide dismutase.
 
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Designer Nanoreactors for Bioorthogonal Catalysis.

Amit Kumar1, In Su Lee1,2

  • 1Creative Research Initiative Center for Nanospace-Confined Chemical Reactions (NCCRs) and Department of Chemistry, Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea.

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Researchers developed designer nanoreactors (NRs) for bioorthogonal catalysis, enabling new-to-nature reactions within living systems. These nanoreactors precisely control reactions using light or magnetic fields, paving the way for in-cell synthesis and biomedical applications.

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Area of Science:

  • Nanotechnology and Materials Science
  • Catalysis and Chemical Engineering
  • Biomedical Engineering and Synthetic Biology

Background:

  • Living systems rely on complex chemical cascades within compartmentalized structures.
  • Synthetic chemistry has advanced control over materials at multiple length scales, enabling tailored optoelectronic and catalytic properties.
  • Bioorthogonal catalysis allows new reactions inside living systems, but conventional catalysts struggle under physiological conditions.

Purpose of the Study:

  • To develop bioapplicable multicomponent designer nanoreactors (NRs) for precise control of catalytic reactions under physiological conditions.
  • To integrate plasmonic and magnetic components for remote activation of catalytic sites using NIR light and alternating magnetic fields (AMF).
  • To enable spatiotemporal control of abiotic chemical synthesis within living cells for applications like drug synthesis and bioimaging.

Main Methods:

  • Design and synthesis of silica-based nanoreactors with controlled porosity, morphology, and interfacial active sites.
  • Incorporation of metal nanocatalysts, enzymes, and selectivity enhancers within nanoreactor architectures.
  • Integration of plasmonic (Au) components for NIR light-induced photothermal and electronic effects, and superparamagnetic iron-oxide cores for AMF-induced magnetothermia.

Main Results:

  • Developed nanoreactors capable of accommodating, protecting, and selectively accessing catalytic sites.
  • Demonstrated NIR-light-induced and magnetothermia-induced catalytic reactions in complex media, including living cells.
  • Showcased dual-energy source activation (NIR light and AMF) for controlling distinct reaction steps within a single nanoreactor.

Conclusions:

  • Precisely engineered nanoreactors offer a versatile platform for bioorthogonal catalysis and in-cell synthesis.
  • Remote activation via NIR light and AMF enables spatiotemporal control over abiotic chemical transformations without affecting cell viability.
  • This approach holds significant promise for advancing biomedical engineering, drug discovery, and bioimaging probe development.