2KUB | pdb_00002kub

Solution structure of the alpha subdomain of the major non-repeat unit of Fap1 fimbriae of Streptococcus parasanguis

• PDB DOI: https://doi.org/10.2210/pdb2KUB/pdb

• Classification: STRUCTURAL PROTEIN
• Organism(s): Streptococcus parasanguinis
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2010-02-17 Released: 2010-07-21 
• Deposition Author(s): Ramboarina, S., Garnett, J.A., Bodey, A., Simpson, P., Bardiaux, B., Nilges, M., Matthews, S.

---

Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 100 
• Conformers Submitted: 10 
• Selection Criteria: structures with the lowest energy 

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 Biological Chem 

• PubMed: 20584910 
• DOI: https://doi.org/10.1074/jbc.M110.128165
• Primary Citation 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.

---

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

Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Macromolecule Content 

• Total Structure Weight: 8.82 kDa 
• Atom Count: 615 
• Modeled Residue Count: 81 
• Deposited Residue Count: 81 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Fimbriae-associated protein Fap1	A	81	Streptococcus parasanguinis	Mutation(s): 0  Gene Names: fap1
UniProt
Find proteins for A1C3L3 (Streptococcus parasanguinis) Explore A1C3L3  Go to UniProtKB:  A1C3L3

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 100 
• Conformers Submitted: 10 
• Selection Criteria: structures with the lowest energy 

Structure Validation

Entry History 

Deposition Data

• Released Date: 2010-07-21 
Deposition Author(s): Ramboarina, S., Garnett, J.A., Bodey, A., Simpson, P., Bardiaux, B., Nilges, M., Matthews, S.

Revision History  

• Version 1.0: 2010-07-21
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Version format compliance
• Version 1.2: 2022-03-16
  Changes: Data collection, Database references, Derived calculations
• Version 1.3: 2024-05-29
  Changes: Data collection