8PFB | pdb_00008pfb

Structure of a heteropolymeric type 4 pilus from a monoderm bacterium

• PDB DOI: https://doi.org/10.2210/pdb8PFB/pdb
• EM Map EMD-17645: EMDB EMDataResource

• Classification: PROTEIN FIBRIL
• Organism(s): Streptococcus sanguinis
• Mutation(s): No 


• Deposited: 2023-06-15 Released: 2023-11-22 
• Deposition Author(s): Anger, R., Pieulle, L., Shahin, M., Valette, O., Le Guenno, H., Kosta, A., Pelicic, V., Fronzes, R.
• Funding Organization(s): European Research Council (ERC)

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Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 3.67 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Literature

Structure of a heteropolymeric type 4 pilus from a monoderm bacterium.

Anger, R., Pieulle, L., Shahin, M., Valette, O., Le Guenno, H., Kosta, A., Pelicic, V., Fronzes, R.

(2023) Nat Commun 14: 7143-7143

• PubMed: 37932265 
• DOI: https://doi.org/10.1038/s41467-023-42872-5
• Primary Citation of Related Structures:  
  8PFB


• PubMed Abstract: 
  

  Type 4 pili (T4P) are important virulence factors, which belong to a superfamily of nanomachines ubiquitous in prokaryotes, called type 4 filaments (T4F). T4F are defined as helical polymers of type 4 pilins. Recent advances in cryo-electron microscopy (cryo-EM) led to structures of several T4F, revealing that the long N-terminal α-helix (α1) - the trademark of pilins - packs in the centre of the filaments to form a hydrophobic core. In diderm bacteria - all available bacterial T4F structures are from diderm species - a portion of α1 is melted (unfolded). Here we report that this architecture is conserved in phylogenetically distant monoderm species by determining the structure of Streptococcus sanguinis T4P. Our 3.7 Å resolution cryo-EM structure of S. sanguinis heteropolymeric T4P and the resulting full atomic model including all minor pilins highlight universal features of bacterial T4F and have widespread implications in understanding T4F biology.

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Organizational Affiliation: 
• Institut Européen de Chimie et Biologie, Université de Bordeaux-CNRS (UMR 5234), Pessac, France.
Laboratoire de Chimie Bactérienne, Institut de Microbiologie de la Méditerranée, Aix-Marseille Université-CNRS (UMR 7283), Marseille, France.
MRC Centre for Molecular Bacteriology and Infection, Imperial College London, London, UK.
Plateforme de Microscopie, Institut de Microbiologie de la Méditerranée, Aix-Marseille Université-CNRS, Marseille, France.
Laboratoire de Chimie Bactérienne, Institut de Microbiologie de la Méditerranée, Aix-Marseille Université-CNRS (UMR 7283), Marseille, France. [e-mail].
MRC Centre for Molecular Bacteriology and Infection, Imperial College London, London, UK. [e-mail].
Institut Européen de Chimie et Biologie, Université de Bordeaux-CNRS (UMR 5234), Pessac, France. [e-mail].

Biological Assembly 1  

Global Symmetry: Helical - H  (Explore in 3D)
Global Stoichiometry: Homo 9-mer - A9 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: electron microscopy

Macromolecule Content 

• Total Structure Weight: 132.77 kDa 
• Atom Count: 8,539 
• Modeled Residue Count: 1,136 
• Deposited Residue Count: 1,251 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Type IV pilin PilE1	A [auth G], B [auth F], C, D [auth A], E [auth B], F [auth I], G [auth H], H [auth D], I [auth E]	139	Streptococcus sanguinis	Mutation(s): 0
UniProt
Find proteins for A0A0B7GU52 (Streptococcus sanguinis) Explore A0A0B7GU52  Go to UniProtKB:  A0A0B7GU52

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 3.67 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

EM Software:

Task	Software Package	Version
MODEL REFINEMENT	PHENIX

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2023-11-22 
Deposition Author(s): Anger, R., Pieulle, L., Shahin, M., Valette, O., Le Guenno, H., Kosta, A., Pelicic, V., Fronzes, R.

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Funding Organization	Location	Grant Number
European Research Council (ERC)	European Union	725554

Revision History  

• Version 1.0: 2023-11-22
  Type: Initial release
  
• Version 1.1: 2025-07-09
  Changes: Data collection, Structure summary