3SYJ

Crystal structure of the Haemophilus influenzae Hap adhesin

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.186 
  • R-Value Observed: 0.189 

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This is version 1.2 of the entry. See complete history. 


Literature

Crystal structure of the Haemophilus influenzae Hap adhesin reveals an intercellular oligomerization mechanism for bacterial aggregation

Meng, G., Spahich, N., Kenjale, R., Waksman, G., St Geme III, J.W.

(2011) EMBO J 30: 3864-3874

  • DOI: 10.1038/emboj.2011.279
  • Primary Citation of Related Structures:  
    3SYJ

  • PubMed Abstract: 

    • Bacterial biofilms are complex microbial communities that are common in nature and are being recognized increasingly as an important determinant of bacterial virulence. However, the structural determinants of bacterial aggregation and eventual biofilm formation have been poorly defined ...

    Bacterial biofilms are complex microbial communities that are common in nature and are being recognized increasingly as an important determinant of bacterial virulence. However, the structural determinants of bacterial aggregation and eventual biofilm formation have been poorly defined. In Gram-negative bacteria, a major subgroup of extracellular proteins called self-associating autotransporters (SAATs) can mediate cell-cell adhesion and facilitate biofilm formation. In this study, we used the Haemophilus influenzae Hap autotransporter as a prototype SAAT to understand how bacteria associate with each other. The crystal structure of the H. influenzae Hap(S) passenger domain (harbouring the SAAT domain) was determined to 2.2 Å by X-ray crystallography, revealing an unprecedented intercellular oligomerization mechanism for cell-cell interaction. The C-terminal SAAT domain folds into a triangular-prism-like structure that can mediate Hap-Hap dimerization and higher degrees of multimerization through its F1-F2 edge and F2 face. The intercellular multimerization can give rise to massive buried surfaces that are required for overcoming the repulsive force between cells, leading to bacterial cell-cell interaction and formation of complex microcolonies.

    Organizational Affiliation: 

    State Key Laboratory of Medical Genomics, Shanghai Institute of Hematology, Rui-Jin Hospital affiliated to Shanghai JiaoTong University School of Medicine, PR China. guoyumeng@shsmu.edu.cn



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Adhesion and penetration protein autotransporterA1011Haemophilus influenzaeMutation(s): 0 
Gene Names: hap
EC: 3.4.21
UniProt
Find proteins for P45387 (Haemophilus influenzae)
Explore P45387 
Go to UniProtKB:  P45387
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP45387
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.186 
  • R-Value Observed: 0.189 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 41.41α = 90
b = 137.2β = 90
c = 209.58γ = 90
Software Package:
Software NamePurpose
DNAdata collection
PHASERphasing
PHENIXrefinement
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

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View more in-depth experimental data

Entry History 

Deposition Data

  • Deposited Date: 2011-07-18 
  • Released Date: 2011-08-24 
    • Deposition Author(s): Meng, G.

Revision History  (Full details and data files)

  • Version 1.0: 2011-08-24
    Type: Initial release
  • Version 1.1: 2013-07-03
    Changes: Database references
  • Version 1.2: 2017-11-08
    Changes: Refinement description