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)

Macromolecule Content

• Total Structure Weight: 14.49 kDa 
• Atom Count: 1243 
• Residue Count: 132 
• Unique protein chains: 1

3TIP

Crystal structure of Staphylococcus aureus SasG E-G52 module

• DOI: 10.2210/pdb3TIP/pdb

• Classification: STRUCTURAL PROTEIN
• Organism(s): Staphylococcus aureus subsp. aureus NCTC 8325
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2011-08-21 Released: 2012-04-18 
• Deposition Author(s): Gruszka, D.T., Wojdyla, J.A., Turkenburg, J.P., Potts, J.R.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.70 Å
• R-Value Free: 0.239 
• R-Value Work: 0.197 
• R-Value Observed: 0.200 

Literature

Staphylococcal biofilm-forming protein has a contiguous rod-like structure.

Gruszka, D.T., Wojdyla, J.A., Bingham, R.J., Turkenburg, J.P., Manfield, I.W., Steward, A., Leech, A.P., Geoghegan, J.A., Foster, T.J., Clarke, J., Potts, J.R.

(2012) Proc Natl Acad Sci U S A 109: E1011-E1018

• PubMed: 22493247 
• DOI: 10.1073/pnas.1119456109
• Structures With Same Primary Citation


• PubMed Abstract: 
  

Staphylococcus aureus and Staphylococcus epidermidis form communities (called biofilms) on inserted medical devices, leading to infections that affect many millions of patients worldwide and cause substantial morbidity and mortality. As biofilms are resistant to antibiotics, device removal is often required to resolve the infection. Thus, there is a need for new therapeutic strategies and molecular data that might assist their development. Surface proteins S. aureus surface protein G (SasG) and accumulation-associated protein (S. epidermidis) promote biofilm formation through their "B" regions. B regions contain tandemly arrayed G5 domains interspersed with approximately 50 residue sequences (herein called E) and have been proposed to mediate intercellular accumulation through Zn(2+)-mediated homodimerization. Although E regions are predicted to be unstructured, SasG and accumulation-associated protein form extended fibrils on the bacterial surface. Here we report structures of E-G5 and G5-E-G5 from SasG and biophysical characteristics of single and multidomain fragments. E sequences fold cooperatively and form interlocking interfaces with G5 domains in a head-to-tail fashion, resulting in a contiguous, elongated, monomeric structure. E and G5 domains lack a compact hydrophobic core, and yet G5 domain and multidomain constructs have thermodynamic stabilities only slightly lower than globular proteins of similar size. Zn(2+) does not cause SasG domains to form dimers. The work reveals a paradigm for formation of fibrils on the 100-nm scale and suggests that biofilm accumulation occurs through a mechanism distinct from the "zinc zipper." Finally, formation of two domains by each repeat (as in SasG) might reduce misfolding in proteins when the tandem arrangement of highly similar sequences is advantageous.

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Organizational Affiliation: 

Department of Biology, University of York, York YO10 5DD, United Kingdom.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Surface protein G	A	132	Staphylococcus aureus subsp. aureus NCTC 8325	Mutation(s): 0  Gene Names: SAOUHSC_02798, sasG
Find proteins for Q2G2B2 (Staphylococcus aureus (strain NCTC 8325)) Go to UniProtKB:  Q2G2B2

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.70 Å
• R-Value Free: 0.239 
• R-Value Work: 0.197 
• R-Value Observed: 0.200 
• Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 36.813	α = 90
b = 34.721	β = 99.54
c = 55.821	γ = 90

Software Package:

Software Name	Purpose
SCALA	data scaling
PHENIX	refinement
PDB_EXTRACT	data extraction
GDA	data collection
XDS	data reduction
MADSYS	phasing
PHASER	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2011-08-21 
• Released Date: 2012-04-18 
Deposition Author(s): Gruszka, D.T., Wojdyla, J.A., Turkenburg, J.P., Potts, J.R.

Revision History 

• Version 1.0: 2012-04-18
  Type: Initial release
  
• Version 1.1: 2012-04-25
  Changes: Database references
• Version 1.2: 2012-05-09
  Changes: Database references
• Version 1.3: 2017-11-08
  Changes: Refinement description