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Directed Protein Packaging within Outer Membrane Vesicles from Escherichia coli: Design, Production and Purification

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Published on: November 16, 2016

Controlled Enzyme Cargo Loading in Engineered Bacterial Microcompartment Shells.

Nicholas M Tefft¹, Yali Wang², Alexander Jussupow¹

¹Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, Michigan 48824, United States.

|March 5, 2025

Summary

This summary is machine-generated.

Bacterial microcompartments (BMCs) offer a platform for metabolic engineering. Researchers found that the Haliangium ochraceum (HO) shell efficiently loads enzymes, with simpler variants showing robust assembly and promising potential.

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Area of Science:

Synthetic Biology
Biochemistry
Protein Engineering

Background:

Bacterial microcompartments (BMCs) are protein-based organelles that encapsulate enzymes for improved metabolic pathway catalysis.
The Haliangium ochraceum (HO) BMC shell is a modular system adaptable for non-native cargo loading, including engineered protein conjugation systems like SpyCatcher-SpyTag.

Purpose of the Study:

To investigate non-native cargo loading into four HO shell variants using triose phosphate isomerase (Tpi) as a model enzyme.
To determine maximal shell loading levels and assess the activity of encapsulated Tpi.
To evaluate the suitability of HO shell variants as a platform for metabolic engineering.

Main Methods:

Expression and assembly of four HO shell variants.
Loading of model enzyme triose phosphate isomerase (Tpi) into HO shells.
Measurement of Tpi activity within encapsulated shells and assessment of shell assembly robustness.

Main Results:

All tested HO shell variants successfully loaded active Tpi.
Enzyme activity correlated with the amount of cargo loaded, not significantly impacted by predicted shell permeability to large molecules.
Simpler HO shell variants demonstrated more robust assembly compared to more complex variants.

Conclusions:

HO shell variants can be engineered to encapsulate active enzymes for potential metabolic engineering applications.
The amount of loaded cargo is a key determinant of enzyme activity within the microcompartment.
The simplest HO shell variant is the most promising for future development as a metabolic engineering platform.