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Self-Assembling Protein Materials with Genetically Programmable Morphology and Size.

Jacob B Miller1, Charlotte Abrahamson2, Marilyn F S Lee3

  • 1Interdisciplinary Biological Sciences Program, Northwestern University, Evanston, Illinois 60208, United States.

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|November 21, 2025
PubMed
Summary
This summary is machine-generated.

Researchers used cell-free protein synthesis to study how bacterial microcompartment (BMC-H) proteins self-assemble. Minor sequence changes in these proteins dramatically altered the resulting supramolecular structures, offering insights for designing programmable materials.

Keywords:
Bacterial MicrocompartmentsBiomaterialsCell-Free Protein SynthesisProtein AssemblySelf-AssemblySynthetic Biology

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Area of Science:

  • Biomaterials science
  • Synthetic biology
  • Protein self-assembly

Background:

  • Atom-level synthetic programming of materials is difficult.
  • Nature efficiently creates hierarchical materials from nanoscale building blocks.
  • Understanding self-assembly rules is key to designing programmable materials.

Purpose of the Study:

  • Investigate the self-assembly behavior of hexameric bacterial microcompartment (BMC-H) proteins.
  • Explore how sequence variations influence supramolecular structure.
  • Leverage BMC-H proteins as a model system for programmable materials.

Main Methods:

  • Utilized cell-free protein synthesis (CFPS) for protein expression.
  • Employed immunostaining and super-resolution microscopy for structural analysis.
  • Studied self-assembly of PduA and PduJ BMC-H proteins.

Main Results:

  • Both PduA and PduJ proteins formed micron- to millimeter-scale structures in vitro.
  • Single-point mutations in PduA and PduJ resulted in distinct supramolecular architectures.
  • Demonstrated the impact of minor sequence changes on self-assembly outcomes.

Conclusions:

  • BMC-H proteins are promising model systems for studying self-assembly.
  • Sequence variations can precisely control self-assembled material structures.
  • Supports the use of self-assembling proteins as programmable scaffolds for materials applications.