Crystal structure of archaeal flagellin FlaB1 from Methanocaldococcus jannaschii

Experimental Data Snapshot

  • Resolution: 1.50 Å
  • R-Value Free: 0.200 
  • R-Value Work: 0.173 
  • R-Value Observed: 0.174 

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High-resolution archaellum structure reveals a conserved metal-binding site.

Meshcheryakov, V.A.Shibata, S.Schreiber, M.T.Villar-Briones, A.Jarrell, K.F.Aizawa, S.I.Wolf, M.

(2019) EMBO Rep 20

  • DOI: https://doi.org/10.15252/embr.201846340
  • Primary Citation of Related Structures:  
    5YA6, 5Z1L

  • PubMed Abstract: 

    Many archaea swim by means of archaella. While the archaellum is similar in function to its bacterial counterpart, its structure, composition, and evolution are fundamentally different. Archaella are related to archaeal and bacterial type IV pili. Despite recent advances, our understanding of molecular processes governing archaellum assembly and stability is still incomplete. Here, we determine the structures of Methanococcus archaella by X-ray crystallography and cryo-EM The crystal structure of Methanocaldococcus jannaschii FlaB1 is the first and only crystal structure of any archaellin to date at a resolution of 1.5 Å, which is put into biological context by a cryo-EM reconstruction from Methanococcus maripaludis archaella at 4 Å resolution created with helical single-particle analysis. Our results indicate that the archaellum is predominantly composed of FlaB1. We identify N-linked glycosylation by cryo-EM and mass spectrometry. The crystal structure reveals a highly conserved metal-binding site, which is validated by mass spectrometry and electron energy-loss spectroscopy. We show in vitro that the metal-binding site, which appears to be a widespread property of archaellin, is required for filament integrity.

  • Organizational Affiliation

    Molecular Cryo-Electron Microscopy Unit, Okinawa Institute of Science and Technology Graduate University, Onna, Kunigami, Okinawa, Japan.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Flagellin B1
A, B
174Methanocaldococcus jannaschii DSM 2661Mutation(s): 0 
Gene Names: flaB1MJ0891
Find proteins for Q58301 (Methanocaldococcus jannaschii (strain ATCC 43067 / DSM 2661 / JAL-1 / JCM 10045 / NBRC 100440))
Explore Q58301 
Go to UniProtKB:  Q58301
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ58301
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.50 Å
  • R-Value Free: 0.200 
  • R-Value Work: 0.173 
  • R-Value Observed: 0.174 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 37.09α = 90
b = 73.66β = 90
c = 107.29γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2019-02-06
    Type: Initial release
  • Version 1.1: 2019-05-01
    Changes: Data collection, Database references
  • Version 1.2: 2019-05-22
    Changes: Data collection, Database references
  • Version 2.0: 2019-11-20
    Changes: Advisory, Atomic model, Database references, Derived calculations, Polymer sequence, Source and taxonomy, Structure summary
  • Version 2.1: 2024-03-27
    Changes: Data collection, Database references, Derived calculations