6QIY

CI-2, conformation 1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.50 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.211 
  • R-Value Observed: 0.213 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Engineering protein assemblies with allosteric control via monomer fold-switching.

Campos, L.A.Sharma, R.Alvira, S.Ruiz, F.M.Ibarra-Molero, B.Sadqi, M.Alfonso, C.Rivas, G.Sanchez-Ruiz, J.M.Romero Garrido, A.Valpuesta, J.M.Munoz, V.

(2019) Nat Commun 10: 5703-5703

  • DOI: https://doi.org/10.1038/s41467-019-13686-1
  • Primary Citation of Related Structures:  
    6QIY, 6QIZ

  • PubMed Abstract: 

    The macromolecular machines of life use allosteric control to self-assemble, dissociate and change shape in response to signals. Despite enormous interest, the design of nanoscale allosteric assemblies has proven tremendously challenging. Here we present a proof of concept of allosteric assembly in which an engineered fold switch on the protein monomer triggers or blocks assembly. Our design is based on the hyper-stable, naturally monomeric protein CI2, a paradigm of simple two-state folding, and the toroidal arrangement with 6-fold symmetry that it only adopts in crystalline form. We engineer CI2 to enable a switch between the native and an alternate, latent fold that self-assembles onto hexagonal toroidal particles by exposing a favorable inter-monomer interface. The assembly is controlled on demand via the competing effects of temperature and a designed short peptide. These findings unveil a remarkable potential for structural metamorphosis in proteins and demonstrate key principles for engineering protein-based nanomachinery.


  • Organizational Affiliation

    Centro Nacional de Biotecnología (CNB-CSIC), Darwin 3, Campus de Cantoblanco, 28049, Madrid, Spain.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Subtilisin-chymotrypsin inhibitor-2A65Hordeum vulgareMutation(s): 0 
UniProt
Find proteins for P01053 (Hordeum vulgare)
Explore P01053 
Go to UniProtKB:  P01053
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP01053
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.50 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.211 
  • R-Value Observed: 0.213 
  • Space Group: P 6 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 68.773α = 90
b = 68.773β = 90
c = 50.564γ = 120
Software Package:
Software NamePurpose
XDSdata reduction
XDSdata scaling
PHENIXphasing
PHENIXrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2019-12-25
    Type: Initial release
  • Version 1.1: 2024-01-24
    Changes: Data collection, Database references, Refinement description