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Amplifying Signals via Enzymatic Cascade01:22

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When a ligand binds to a cell-surface receptor, the receptor's intracellular domain changes shape, which may either activate its enzyme function or allow its binding to other molecules. The initial signal is amplified by most signal transduction pathways. This means that a single ligand molecule can activate multiple molecules of a downstream target. Proteins that relay a signal are most commonly phosphorylated at one or more sites, activating or inactivating the protein. Kinases catalyze...
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Once a ligand binds to a receptor, the signal is transmitted through the membrane and into the cytoplasm. The continuation of a signal in this manner is called signal transduction. Signal transduction only occurs with cell-surface receptors, which cannot interact with most components of the cell, such as DNA. Only internal receptors can interact directly with DNA in the nucleus to initiate protein synthesis. When a ligand binds to its receptor, conformational changes occur that affect the...
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Updated: Sep 23, 2025

Multi-enzyme Screening Using a High-throughput Genetic Enzyme Screening System
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Microscale Colocalization of Cascade Enzymes Yields Activity Enhancement.

Yan Xiong1, Stanislav Tsitkov2, Henry Hess2

  • 1Department of Chemical Engineering, Columbia University, New York, New York 10027, United States.

ACS Nano
|May 13, 2022
PubMed
Summary
This summary is machine-generated.

Enzyme colocalization on microspheres enhances cascade reaction efficiency. This study demonstrates how enzyme proximity boosts throughput, supporting the design of advanced multienzyme catalysts.

Keywords:
DNA strand-displacement reactionactivity enhancementcolocalizationenzyme cascadesubstrate channeling

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Area of Science:

  • Biochemistry
  • Chemical Engineering
  • Nanotechnology

Background:

  • Enzyme colocalization is theorized to increase cascade reaction rates but lacks direct experimental validation.
  • Challenges include controlling enzyme dispersion and quantifying colocalization effects accurately.
  • Developing robust experimental systems is crucial for verifying these benefits.

Purpose of the Study:

  • To experimentally evaluate the impact of enzyme colocalization on cascade reaction throughput.
  • To establish a system for directly comparing colocalized and dispersed enzyme cascades under identical conditions.
  • To investigate the underlying mechanisms and scale-dependent factors influencing colocalization enhancement.

Main Methods:

  • Utilized reversible DNA-directed immobilization of enzymes onto microspheres.
  • Established a model cascade system on highly dilute microspheres of specific sizes.
  • Employed time-course analysis and reaction-diffusion modeling for quantification.

Main Results:

  • Colocalized enzyme cascades exhibited enhanced activity, indicated by a shorter lag phase in product formation.
  • Reaction-diffusion modeling identified intermediate substrate accumulation as a key factor for enhancement.
  • The observed enhancement was dependent on the carrier size (microsphere size).

Conclusions:

  • Direct experimental evidence confirms that enzyme colocalization boosts cascade reaction throughput.
  • The colocalization effect is influenced by the interplay between nanoscale enzyme arrangement and microscale carrier size.
  • Findings provide theoretical support for the rational design of efficient multienzyme catalysts.