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Updated: Jun 2, 2026

Analyzing Large Protein Complexes by Structural Mass Spectrometry
Published on: June 20, 2010
Diversification of Protein Cage Structure Using Circularly Permuted Subunits
Yusuke Azuma1, Michael Herger1, Donald Hilvert1
1Laboratory of Organic Chemistry, ETH Zurich , 8093 Zurich, Switzerland.
Researchers engineered a circularly permuted lumazine synthase (cpAaLS) protein to create versatile protein cages. This novel building block allows for tunable structures and diverse applications in biotechnology and medicine.
Area of Science:
- Biotechnology
- Protein Engineering
- Nanotechnology
Background:
- Self-assembling protein cages are valuable nanoscale containers for biotechnology and medicine.
- Customizing natural cage proteins and designing new ones is crucial for expanding their utility.
Purpose of the Study:
- To engineer a versatile building block for constructing custom protein nanocompartments.
- To explore the potential of circular permutation in tailoring cage protein properties.
Main Methods:
- Circular permutation of Aquifex aeolicus lumazine synthase (AaLS) to create cpAaLS.
- Self-assembly of cpAaLS into spherical and tubular cages.
- Co-production of cpAaLS with wild-type AaLS to form patchwork cages.
Main Results:
- cpAaLS self-assembles into controllable spherical and tubular cage structures.
- Patchwork cages formed by coassembly enable guest protein encapsulation and exterior modification.
- The strategy allows for tuning compartment size and electrostatics.
Conclusions:
- Circularly permuted AaLS (cpAaLS) provides versatile building blocks for protein nanocompartments.
- Coassembly offers a method for creating functionalized and tailored protein cages.
- Circular permutation is a promising strategy for protein cage engineering.
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