3WI5

Crystal structure of the Loop 7 mutant PorB from Neisseria meningitidis serogroup B


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.227 
  • R-Value Observed: 0.229 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Crystallographic analysis of Neisseria meningitidis PorB extracellular loops potentially implicated in TLR2 recognition.

Kattner, C.Toussi, D.N.Zaucha, J.Wetzler, L.M.Ruppel, N.Zachariae, U.Massari, P.Tanabe, M.

(2014) J Struct Biol 185: 440-447

  • DOI: 10.1016/j.jsb.2013.12.006
  • Primary Citation of Related Structures:  
    3WI5, 3WI4

  • PubMed Abstract: 
  • Among all Neisseriae species, Neisseria meningitidis and Neisseria gonorrhoeae are the only human pathogens, causative agents of bacterial meningitis and gonorrhoea, respectively. PorB, a pan-Neisseriae trimeric porin that mediates diffusive transport of essential molecules across the bacterial outer membrane, is also known to activate host innate immunity via Toll-like receptor 2 (TLR2)-mediated signaling ...

    Among all Neisseriae species, Neisseria meningitidis and Neisseria gonorrhoeae are the only human pathogens, causative agents of bacterial meningitis and gonorrhoea, respectively. PorB, a pan-Neisseriae trimeric porin that mediates diffusive transport of essential molecules across the bacterial outer membrane, is also known to activate host innate immunity via Toll-like receptor 2 (TLR2)-mediated signaling. The molecular mechanism of PorB binding to TLR2 is not known, but it has been hypothesized that electrostatic interactions contribute to ligand/receptor binding. Strain-specific sequence variability in the surface-exposed loops of PorB which are potentially implicated in TLR2 binding, may explain the difference in TLR2-mediated cell activation in vitro by PorB homologs from the commensal Neisseriae lactamica and the pathogen N. meningitidis. Here, we report a comparative structural analysis of PorB from N. meningitidis serogroup B strain 8765 (63% sequence homology with PorB from N. meningitidis serogroup W135) and a mutant in which amino acid substitutions in the extracellular loop 7 lead to significantly reduced TLR2-dependent activity in vitro. We observe that this mutation both alters the loop conformation and causes dramatic changes of electrostatic surface charge, both of which may affect TLR2 recognition and signaling.


    Organizational Affiliation

    HALOmem, Membrane Protein Biochemistry, Martin-Luther-University Halle-Wittenberg, Halle (Saale), Germany. Electronic address: mt@halomem.de.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Major outer membrane protein P.IBA312Neisseria meningitidisMutation(s): 3 
Gene Names: porBNMB2039
Membrane protein
Mpstruc
Group: 
TRANSMEMBRANE PROTEINS: BETA-BARREL
Sub Group: 
Beta-Barrel Membrane Proteins: Porins and Relatives
Protein: 
PorB outer membrane protein
Find proteins for P30690 (Neisseria meningitidis serogroup B (strain MC58))
Explore P30690 
Go to UniProtKB:  P30690
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
FLC
Query on FLC

Download Ideal Coordinates CCD File 
B [auth A], C [auth A]CITRATE ANION
C6 H5 O7
KRKNYBCHXYNGOX-UHFFFAOYSA-K
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.227 
  • R-Value Observed: 0.229 
  • Space Group: H 3 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 143.486α = 90
b = 143.486β = 90
c = 178.42γ = 120
Software Package:
Software NamePurpose
HKL-2000data collection
MLPHAREphasing
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling
PHASESphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-01-01
    Type: Initial release
  • Version 1.1: 2014-03-12
    Changes: Database references