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Navigating the Structural Landscape of De Novo α-Helical Bundles

Research output: Contribution to journalArticle

Original languageEnglish
Pages (from-to)8787-8797
Number of pages11
JournalJournal of the American Chemical Society
Volume141
Issue number22
Early online date22 May 2019
DOIs
DateAccepted/In press - 8 May 2019
DateE-pub ahead of print - 22 May 2019
DatePublished (current) - 5 Jun 2019

Abstract

The association of amphipathic α helices in water leads to α-helical-bundle protein structures. However, the driving force for this-the hydrophobic effect-is not specific and does not define the number or the orientation of helices in the associated state. Rather, this is achieved through deeper sequence-to-structure relationships, which are increasingly being discerned. For example, for one structurally extreme but nevertheless ubiquitous class of bundle-the α-helical coiled coils-relationships have been established that discriminate between all-parallel dimers, trimers, and tetramers. Association states above this are known, as are antiparallel and mixed arrangements of the helices. However, these alternative states are less well understood. Here, we describe a synthetic-peptide system that switches between parallel hexamers and various up-down-up-down tetramers in response to single-amino-acid changes and solution conditions. The main accessible states of each peptide variant are characterized fully in solution and, in most cases, to high resolution with X-ray crystal structures. Analysis and inspection of these structures helps rationalize the different states formed. This navigation of the structural landscape of α-helical coiled coils above the dimers and trimers that dominate in nature has allowed us to design rationally a well-defined and hyperstable antiparallel coiled-coil tetramer (apCC-Tet). This robust de novo protein provides another scaffold for further structural and functional designs in protein engineering and synthetic biology.

    Research areas

  • SYNTHETIC BIOLOGY

    Structured keywords

  • BrisSynBio
  • Bristol BioDesign Institute

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  • Full-text PDF (accepted author manuscript)

    Rights statement: This is the author accepted manuscript (AAM). The final published version (version of record) is available online via ACS at https://pubs.acs.org/doi/abs/10.1021/jacs.8b13354 . Please refer to any applicable terms of use of the publisher.

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