MloK1 consensus structure from single particle analysis of 2D crystals

Experimental Data Snapshot

  • Resolution: 4.00 Å
  • Aggregation State: 2D ARRAY 
  • Reconstruction Method: SINGLE PARTICLE 

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Retrieving high-resolution information from disordered 2D crystals by single-particle cryo-EM.

Righetto, R.D.Biyani, N.Kowal, J.Chami, M.Stahlberg, H.

(2019) Nat Commun 10: 1722-1722

  • DOI: https://doi.org/10.1038/s41467-019-09661-5
  • Primary Citation of Related Structures:  
    6I9D, 6IAX, 6QCY, 6QCZ, 6QD0, 6QD1, 6QD2, 6QD3, 6QD4

  • PubMed Abstract: 

    Electron crystallography can reveal the structure of membrane proteins within 2D crystals under close-to-native conditions. High-resolution structural information can only be reached if crystals are perfectly flat and highly ordered. In practice, such crystals are difficult to obtain. Available image unbending algorithms correct for disorder, but only perform well on images of non-tilted, flat crystals, while out-of-plane distortions are not addressed. Here, we present an approach that employs single-particle refinement procedures to locally unbend crystals in 3D. With this method, density maps of the MloK1 potassium channel with a resolution of 4 Å were obtained from images of 2D crystals that do not diffract beyond 10 Å. Furthermore, 3D classification allowed multiple structures to be resolved, revealing a series of MloK1 conformations within a single 2D crystal. This conformational heterogeneity explains the poor diffraction observed and is related to channel function. The approach is implemented in the FOCUS package.

  • Organizational Affiliation

    Center for Cellular Imaging and NanoAnalytics, Biozentrum, University of Basel, Mattenstrasse 26, CH-4058, Basel, Switzerland.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Cyclic nucleotide-gated potassium channel mll3241
A, B, C, D
355Mesorhizobium japonicum MAFF 303099Mutation(s): 0 
Gene Names: mll3241
Membrane Entity: Yes 
Find proteins for Q98GN8 (Mesorhizobium japonicum (strain LMG 29417 / CECT 9101 / MAFF 303099))
Explore Q98GN8 
Go to UniProtKB:  Q98GN8
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ98GN8
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 4.00 Å
  • Aggregation State: 2D ARRAY 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Swiss National Science FoundationSwitzerland205320_166164

Revision History  (Full details and data files)

  • Version 1.0: 2019-04-24
    Type: Initial release
  • Version 1.1: 2024-05-15
    Changes: Data collection, Database references, Derived calculations, Experimental preparation, Refinement description