The archaeal flagellum of Methanospirillum hungatei strain JF1.

Experimental Data Snapshot

  • Resolution: 3.40 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: HELICAL 

wwPDB Validation   3D Report Full Report

This is version 1.5 of the entry. See complete history


CryoEM structure of the Methanospirillum hungatei archaellum reveals structural features distinct from the bacterial flagellum and type IV pili.

Poweleit, N.Ge, P.Nguyen, H.H.Loo, R.R.Gunsalus, R.P.Zhou, Z.H.

(2016) Nat Microbiol 2: 16222-16222

  • DOI: https://doi.org/10.1038/nmicrobiol.2016.222
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Archaea use flagella known as archaella-distinct both in protein composition and structure from bacterial flagella-to drive cell motility, but the structural basis of this function is unknown. Here, we report an atomic model of the archaella, based on the cryo electron microscopy (cryoEM) structure of the Methanospirillum hungatei archaellum at 3.4 Å resolution. Each archaellum contains ∼61,500 archaellin subunits organized into a curved helix with a diameter of 10 nm and average length of 10,000 nm. The tadpole-shaped archaellin monomer has two domains, a β-barrel domain and a long, mildly kinked α-helix tail. Our structure reveals multiple post-translational modifications to the archaella, including six O-linked glycans and an unusual N-linked modification. The extensive interactions among neighbouring archaellins explain how the long but thin archaellum maintains the structural integrity required for motility-driving rotation. These extensive inter-subunit interactions and the absence of a central pore in the archaellum distinguish it from both the bacterial flagellum and type IV pili.

  • Organizational Affiliation

    Department of Microbiology, Immunology, and Molecular Genetics, University of California, Los Angeles (UCLA), Los Angeles, California 90095, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Flagellin164Methanospirillum hungatei JF-1Mutation(s): 0 
Find proteins for Q2FUM4 (Methanospirillum hungatei JF-1 (strain ATCC 27890 / DSM 864 / NBRC 100397 / JF-1))
Explore Q2FUM4 
Go to UniProtKB:  Q2FUM4
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ2FUM4
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 3.40 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: HELICAL 

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of Health/Office of the DirectorUnited States1S10OD018111
National Science Foundation (NSF, United States)United StatesDBI-1338135

Revision History  (Full details and data files)

  • Version 1.0: 2016-12-07
    Type: Initial release
  • Version 1.1: 2017-01-11
    Changes: Database references
  • Version 1.2: 2017-09-20
    Changes: Author supporting evidence, Data collection
  • Version 1.3: 2017-11-08
    Changes: Derived calculations
  • Version 1.4: 2019-11-27
    Changes: Author supporting evidence
  • Version 1.5: 2024-03-13
    Changes: Data collection, Database references