Averaged strand structure of a 15-stranded ParM filament from Clostridium botulinum

Experimental Data Snapshot

  • Resolution: 4.20 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: HELICAL 

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The structure of a 15-stranded actin-like filament from Clostridium botulinum.

Koh, F.Narita, A.Lee, L.J.Tanaka, K.Tan, Y.Z.Dandey, V.P.Popp, D.Robinson, R.C.

(2019) Nat Commun 10: 2856-2856

  • DOI: https://doi.org/10.1038/s41467-019-10779-9
  • Primary Citation of Related Structures:  
    6IXW, 6IZR, 6IZV

  • PubMed Abstract: 

    Microfilaments (actin) and microtubules represent the extremes in eukaryotic cytoskeleton cross-sectional dimensions, raising the question of whether filament architectures are limited by protein fold. Here, we report the cryoelectron microscopy structure of a complex filament formed from 15 protofilaments of an actin-like protein. This actin-like ParM is encoded on the large pCBH Clostridium botulinum plasmid. In cross-section, the ~26 nm diameter filament comprises a central helical protofilament surrounded by intermediate and outer layers of six and eight twisted protofilaments, respectively. Alternating polarity of the layers allows for similar lateral contacts between each layer. This filament design is stiffer than the actin filament, and has likely been selected for during evolution to move large cargos. The comparable sizes of microtubule and pCBH ParM filaments indicate that larger filament architectures are not limited by the protomer fold. Instead, function appears to have been the evolutionary driving force to produce broad, complex filaments.

  • Organizational Affiliation

    Graduate School for Integrative Sciences and Engineering, National University of Singapore, Singapore, 138632, Singapore.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Putative plasmid segregation protein ParMA [auth 0],
B [auth 1]
349Clostridium botulinum Prevot_594Mutation(s): 0 
Gene Names: T258_3831
Find proteins for A0A0B4W229 (Clostridium botulinum Prevot_594)
Explore A0A0B4W229 
Go to UniProtKB:  A0A0B4W229
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A0B4W229
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 4.20 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: HELICAL 
EM Software:
TaskSoftware PackageVersion

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Other privateUnited StatesSF349247
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesGM103310
Other privateUnited StatesF00316

Revision History  (Full details and data files)

  • Version 1.0: 2019-06-19
    Type: Initial release
  • Version 1.1: 2019-07-10
    Changes: Data collection, Database references
  • Version 1.2: 2022-03-23
    Changes: Author supporting evidence, Database references, Derived calculations