5Y9H

Crystal structure of SafDAA-dsc complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.255 
  • R-Value Work: 0.219 
  • R-Value Observed: 0.221 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Structural basis of host recognition and biofilm formation by Salmonella Saf pili

Zeng, L.H.Zhang, L.Wang, P.R.Meng, G.

(2017) Elife 6

  • DOI: 10.7554/eLife.28619
  • Primary Citation of Related Structures:  
    5Y9H, 5Y9G

  • PubMed Abstract: 
  • Pili are critical in host recognition, colonization and biofilm formation during bacterial infection. Here, we report the crystal structures of SafD- dsc and SafD-SafA-SafA (SafDAA- dsc ) in Saf pili. Cell adherence assays show that Sa ...

    Pili are critical in host recognition, colonization and biofilm formation during bacterial infection. Here, we report the crystal structures of SafD- dsc and SafD-SafA-SafA (SafDAA- dsc ) in Saf pili. Cell adherence assays show that SafD and SafA are both required for host recognition, suggesting a poly-adhesive mechanism for Saf pili. Moreover, the SafDAA- dsc structure, as well as SAXS characterization, reveals an unexpected inter-molecular oligomerization, prompting the investigation of Saf-driven self-association in biofilm formation. The bead/cell aggregation and biofilm formation assays are used to demonstrate the novel function of Saf pili. Structure-based mutants targeting the inter-molecular hydrogen bonds and complementary architecture/surfaces in SafDAA- dsc dimers significantly impaired the Saf self-association activity and biofilm formation. In summary, our results identify two novel functions of Saf pili: the poly-adhesive and self-associating activities. More importantly, Saf-Saf structures and functional characterizations help to define a pili-mediated inter-cellular oligomerizaiton mechanism for bacterial aggregation, colonization and ultimate biofilm formation.


    Organizational Affiliation

    State Key Laboratory of Medical Genomics, Shanghai Institute of Hematology, Rui-Jin Hospital, Shanghai JiaoTong University School of Medicine and School of Life Sciences and Biotechnology, Shanghai JiaoTong University, Shanghai, China.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
SafD,Putative outer membrane protein,Putative outer membrane protein,Putative outer membrane proteinABC466Salmonella enterica subsp. enterica serovar TyphimuriumSalmonella enterica subsp. enterica serovar Typhimurium str. LT2Mutation(s): 0 
Gene Names: safD
Find proteins for Q7CR56 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720))
Explore Q7CR56 
Go to UniProtKB:  Q7CR56
Find proteins for Q8ZRK4 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720))
Explore Q8ZRK4 
Go to UniProtKB:  Q8ZRK4
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.255 
  • R-Value Work: 0.219 
  • R-Value Observed: 0.221 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 133.27α = 90
b = 66.07β = 96.22
c = 187.68γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
iMOSFLMdata reduction
SCALAdata scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2017-11-15
    Type: Initial release
  • Version 1.1: 2017-12-06
    Changes: Database references