PreprintCited by 8Protein Structure and DynamicsBiochemical and Structural CharacterizationProtein purification and stability

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Design of a symmetry-broken tetrahedral protein cage by a method of internal steric occlusion

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Preprint — published as 10.1002/pro.4973

Abstract

Methods in protein design have made it possible to create large and complex, self-assembling protein cages with diverse applications. These have largely been based on highly symmetric forms exemplified by the Platonic solids. Prospective applications of protein cages would be expanded by strategies for breaking the designed symmetry, e . g ., so that only one or a few (instead of many) copies of an exterior domain or motif might be displayed on their surfaces. Here we demonstrate a straightforward design approach for creating symmetry-broken protein cages able to display singular copies of outward-facing domains. We modify the subunit of an otherwise symmetric protein cage through fusion to a small inward-facing domain, only one copy of which can be accommodated in the cage interior. Using biochemical methods and native mass spectrometry, we show that co-expression of the original subunit and the modified subunit, which is further fused to an outward-facing anti-GFP DARPin domain, leads to self-assembly of a protein cage presenting just one copy of the DARPin protein on its exterior. This strategy of designed occlusion provides a facile route for creating new types of protein cages with unique properties.

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Metadata

Authors
Gladkov, N., Scott, E. A., Meador, K., Lee, E. J., Laganowsky, A. D., Yeates, T. O., & Castells-Graells, R.
Affiliations
  • University of California, Los Angeles (US)
  • Texas A&M University (US)
Corresponding author
Yeates, Todd O.
Venue
Protein Science
Publisher
openRxiv
Published
2023-11-09
Volume
33
Issue
4
Pages
e4973-e4973
ISSN
0961-8368 (ISSN-L)
OpenAlex
W4393234111
Cited by
8
References
1
Citations by year
2026: 1 · 2025: 5 · 2024: 2
FWCI
1.09
Type
journal article
Language
en
Open access
Licence
cc-by
Locations
  • Protein Science (publishedVersion)
  • bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (submittedVersion, cc-by)
  • OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (submittedVersion)
Funders
  • U.S. Department of Energy (DEFC0202ER63421, FC02-02ER63421)
  • Welch Foundation (A-2106-20220331)
  • National Institutes of Health (DE-FC02-02ER63421, RM1GM1454316)
  • Office of Science (FC02-02ER63421, 02ER63421, DEFC0202ER63421)
  • National Institute of General Medical Sciences (R01GM139876)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Structure and Dynamics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Biochemical and Structural Characterization
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein purification and stability
Keywords
symmetry breaking, steric occlusion, self-assembly, DARPin, Platonic solids

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