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Quantitative Measurement of Molecular Permeability to a Synthetic Bacterial Microcompartment Shell System.

Eric J Young1, Henning Kirst1,2,3, Matthew E Dwyer4

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ACS Synthetic Biology
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Researchers measured the permeability of bacterial microcompartment shells for small molecules. Encapsulated enzymes showed slower reactions, indicating shell permeability is crucial for nanoscale compartmentalization.

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Area of Science:

  • Biochemistry
  • Nanotechnology
  • Synthetic Biology

Background:

  • Compartmentalization enhances biological function by concentrating substrates and protecting molecules.
  • Understanding small-molecule permeability is key to designing effective artificial cellular systems.

Purpose of the Study:

  • To experimentally measure the small-molecule permeability of a 40 nm icosahedral bacterial microcompartment shell.
  • To provide insights into the design of heterologous bacterial microcompartment shell systems.

Main Methods:

  • Heterologous loading of luciferase enzymes into bacterial microcompartment shells.
  • Kinetic measurement of luminescence using stopped-flow spectrophotometry.
  • Modeling of experimental data to determine permeability rates.

Main Results:

  • Encapsulated luciferase exhibited slower luminescence kinetics compared to free enzyme, indicating substrate/product exchange across the shell.
  • Modeling suggested a 50× increase in permeability when shell vertices were vacant.
  • The study quantified small-molecule transport across nanoscale bacterial microcompartment shells.

Conclusions:

  • Bacterial microcompartment shells permit small-molecule exchange, essential for encapsulated enzymatic activity.
  • Shell vertex permeability significantly influences transport rates.
  • Findings inform the engineering of synthetic cellular systems for nanoscale compartmentalization.