Biological Assembly 1  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report

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

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

Macromolecule Content

• Total Structure Weight: 39.36 kDa 
• Atom Count: 2927 
• Modelled Residue Count: 372 
• Deposited Residue Count: 373 
• Unique protein chains: 1

2ODL

Crystal structure of the HMW1 secretion domain from Haemophilus influenzae

• PDB DOI: 10.2210/pdb2ODL/pdb

• Classification: CELL ADHESION
• Organism(s): Haemophilus influenzae
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): Yes 


• Deposited: 2006-12-22 Released: 2007-08-21 
• Deposition Author(s): Yokoyama, T., Yeo, H.J.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.92 Å
• R-Value Free: 0.217 
• R-Value Work: 0.174 
• R-Value Observed: 0.176 

Literature

The structure of the Haemophilus influenzae HMW1 pro-piece reveals a structural domain essential for bacterial two-partner secretion.

Yeo, H.J., Yokoyama, T., Walkiewicz, K., Kim, Y., Grass, S., Geme, J.W.

(2007) J Biol Chem 282: 31076-31084

• PubMed: 17699157 
• DOI: 10.1074/jbc.M705750200
• Primary Citation of Related Structures:  
  2ODL


• PubMed Abstract: 
  

In pathogenic Gram-negative bacteria, many virulence factors are secreted via the two-partner secretion pathway, which consists of an exoprotein called TpsA and a cognate outer membrane translocator called TpsB. The HMW1 and HMW2 adhesins are major virulence factors in nontypeable Haemophilus influenzae and are prototype two-partner secretion pathway exoproteins. A key step in the delivery of HMW1 and HMW2 to the bacterial surface involves targeting to the HMW1B and HMW2B outer membrane translocators by an N-terminal region called the secretion domain. Here we present the crystal structure at 1.92 A of the HMW1 pro-piece (HMW1-PP), a region that contains the HMW1 secretion domain and is cleaved and released during HMW1 secretion. Structural analysis of HMW1-PP revealed a right-handed beta-helix fold containing 12 complete parallel coils and one large extra-helical domain. Comparison of HMW1-PP and the Bordetella pertussis FHA secretion domain (Fha30) reveals limited amino acid homology but shared structural features, suggesting that diverse TpsA proteins have a common structural domain required for targeting to cognate TpsB proteins. Further comparison of HMW1-PP and Fha30 structures may provide insights into the keen specificity of TpsA-TpsB interactions.

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Organizational Affiliation: 

Department of Biology and Biochemistry, University of Houston, Houston, Texas 77204, USA. [e-mail]

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Adhesin	A	373	Haemophilus influenzae	Mutation(s): 4  Gene Names: hmw1A
UniProt
Find proteins for Q48031 (Haemophilus influenzae) Explore Q48031  Go to UniProtKB:  Q48031

Small Molecules

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

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.92 Å
• R-Value Free: 0.217 
• R-Value Work: 0.174 
• R-Value Observed: 0.176 
• Space Group: I 4

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 121.438	α = 90
b = 121.438	β = 90
c = 50.582	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
HKL-2000	data collection
HKL-2000	data reduction
SCALEPACK	data scaling
SHARP	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2006-12-22 
• Released Date: 2007-08-21 
Deposition Author(s): Yokoyama, T., Yeo, H.J.

Revision History  

• Version 1.0: 2007-08-21
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Version format compliance