Biological Assembly 1  

 3D View: Structure | Electron Density

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

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

Biological Assembly 2  

 3D View: Structure | Electron Density

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 2 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 74.53 kDa 
• Atom Count: 2988 
• Residue Count: 400 
• Unique protein chains: 1

2X12

pH-induced modulation of Streptococcus parasanguinis adhesion by Fap1 fimbriae

• DOI: 10.2210/pdb2X12/pdb

• Classification: CELL ADHESION
• Organism(s): Streptococcus parasanguinis
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2009-12-21 Released: 2010-07-07 
• Deposition Author(s): Ramboarina, S., Murray, J.W., Garnett, J., Matthews, S.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.90 Å
• R-Value Free: 0.251 
• R-Value Work: 0.211 
• R-Value Observed: 0.213 

Literature

Structural Insights Into Serine-Rich Fimbriae from Gram-Positive Bacteria.

Ramboarina, S., Garnett, J.A., Zhou, M., Li, Y., Peng, Z., Taylor, J.D., Lee, W.-C., Bodey, A., Murray, J.W., Alguel, Y., Bergeron, J., Bardiaux, B., Sawyer, E., Isaacson, R., Tagliaferri, C., Cota, E., Nilges, M., Simpson, P., Ruiz, T., Wu, H., Matthews, S.

(2010) J Biol Chem 285: 32446

• PubMed: 20584910 
• DOI: 10.1074/jbc.M110.128165
• Primary Citation of Related Structures:  
  2KUB, 2X12


• PubMed Abstract: 
  

The serine-rich repeat family of fimbriae play important roles in the pathogenesis of streptococci and staphylococci. Despite recent attention, their finer structural details and precise adhesion mechanisms have yet to be determined. Fap1 (Fimbriae-associated protein 1) is the major structural subunit of serine-rich repeat fimbriae from Streptococcus parasanguinis and plays an essential role in fimbrial biogenesis, adhesion, and the early stages of dental plaque formation. Combining multidisciplinary, high resolution structural studies with biological assays, we provide new structural insight into adhesion by Fap1. We propose a model in which the serine-rich repeats of Fap1 subunits form an extended structure that projects the N-terminal globular domains away from the bacterial surface for adhesion to the salivary pellicle. We also uncover a novel pH-dependent conformational change that modulates adhesion and likely plays a role in survival in acidic environments.

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Organizational Affiliation: 

Department of Biological Sciences, Centre for Structural Biology, Imperial College London, South Kensington, London SW7 2AZ, United Kingdom.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
FIMBRIAE-ASSOCIATED PROTEIN FAP1	A, B	348	Streptococcus parasanguinis	Mutation(s): 0  Gene Names: fap1
Find proteins for A1C3L3 (Streptococcus parasanguinis) Explore A1C3L3  Go to UniProtKB:  A1C3L3

Small Molecules

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
MSE	A,B	L-PEPTIDE LINKING	C5 H11 N O2 Se		MET

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.90 Å
• R-Value Free: 0.251 
• R-Value Work: 0.211 
• R-Value Observed: 0.213 
• Space Group: P 3₂ 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 108.668	α = 90
b = 108.668	β = 90
c = 126.252	γ = 120

Software Package:

Software Name	Purpose
REFMAC	refinement
MOSFLM	data reduction
SCALA	data scaling
autoSHARP	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2009-12-21 
• Released Date: 2010-07-07 
Deposition Author(s): Ramboarina, S., Murray, J.W., Garnett, J., Matthews, S.

Revision History 

• Version 1.0: 2010-07-07
  Type: Initial release
  
• Version 1.1: 2011-05-08
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2019-05-08
  Changes: Data collection, Derived calculations, Experimental preparation, Other