4WEM

Co-complex structure of the F4 fimbrial adhesin FaeG variant ac with llama single domain antibody V1

• PDB DOI: https://doi.org/10.2210/pdb4WEM/pdb

• Classification: STRUCTURAL PROTEIN
• Organism(s): Escherichia coli, Lama glama
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2014-09-10 Released: 2015-02-04 
• Deposition Author(s): Moonens, K., Van den Broeck, I., Pardon, E., De Kerpel, M., Remaut, H., De Greve, H.
• Funding Organization(s): FWO, FWO - Hercules

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.55 Å
• R-Value Free: 0.193 
• R-Value Work: 0.169 
• R-Value Observed: 0.170 

Starting Model: experimental

Literature

Structural insight in the inhibition of adherence of F4 fimbriae producing enterotoxigenic Escherichia coli by llama single domain antibodies.

Moonens, K., Van den Broeck, I., Okello, E., Pardon, E., De Kerpel, M., Remaut, H., De Greve, H.

(2015) Vet Res 46: 14-14

• PubMed: 25828907 
• DOI: https://doi.org/10.1186/s13567-015-0151-x
• Primary Citation of Related Structures:  
  4WEM, 4WEN, 4WEU


• PubMed Abstract: 
  

  Enterotoxigenic Escherichia coli that cause neonatal and post-weaning diarrhea in piglets express F4 fimbriae to mediate attachment towards host receptors. Recently we described how llama single domain antibodies (VHHs) fused to IgA, produced in Arabidopsis thaliana seeds and fed to piglets resulted in a progressive decline in shedding of F4 positive ETEC bacteria. Here we present the structures of these inhibiting VHHs in complex with the major adhesive subunit FaeG. A conserved surface, distant from the lactose binding pocket, is targeted by these VHHs, highlighting the possibility of targeting epitopes on single-domain adhesins that are non-involved in receptor binding.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 43.06 kDa 
• Atom Count: 3,102 
• Modelled Residue Count: 369 
• Deposited Residue Count: 399 
• Unique protein chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
K88 fimbrial protein AC	A	272	Escherichia coli	Mutation(s): 0  Gene Names: faeG
UniProt
Find proteins for P14190 (Escherichia coli) Explore P14190  Go to UniProtKB:  P14190

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Anti-F4+ETEC bacteria VHH variable region	B	127	Lama glama	Mutation(s): 0
UniProt
Find proteins for R9W2R6 (Lama glama) Explore R9W2R6  Go to UniProtKB:  R9W2R6

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
PO4	C [auth A], D [auth A], E [auth A], F [auth B]	PHOSPHATE ION O4 P NBIIXXVUZAFLBC-UHFFFAOYSA-K

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.55 Å
• R-Value Free: 0.193 
• R-Value Work: 0.169 
• R-Value Observed: 0.170 
• Space Group: P 3 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 145.483	α = 90
b = 145.483	β = 90
c = 38.847	γ = 120

Software Package:

Software Name	Purpose
REFMAC	refinement
XDS	data reduction
SCALA	data scaling
PHASER	phasing

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2015-02-04 
Deposition Author(s): Moonens, K., Van den Broeck, I., Pardon, E., De Kerpel, M., Remaut, H., De Greve, H.

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Funding Organization	Location	Grant Number
FWO	Belgium	G030411N
FWO - Hercules	Belgium	UABR/09/005

Revision History  

• Version 1.0: 2015-02-04
  Type: Initial release
  
• Version 1.1: 2015-04-15
  Changes: Database references
• Version 1.2: 2024-01-10
  Changes: Data collection, Database references, Refinement description
• Version 1.3: 2024-10-16
  Changes: Structure summary