Crystal Structure of outer membrane protein PorB with G103K mutations from Neisseria meningitidis W135

Experimental Data Snapshot

  • Resolution: 2.76 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.213 

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An antibiotic-resistance conferring mutation in a neisserial porin: Structure, ion flux, and ampicillin binding.

Bartsch, A.Ives, C.M.Kattner, C.Pein, F.Diehn, M.Tanabe, M.Munk, A.Zachariae, U.Steinem, C.Llabres, S.

(2021) Biochim Biophys Acta Biomembr 1863: 183601-183601

  • DOI: https://doi.org/10.1016/j.bbamem.2021.183601
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Gram-negative bacteria cause the majority of highly drug-resistant bacterial infections. To cross the outer membrane of the complex Gram-negative cell envelope, antibiotics permeate through porins, trimeric channel proteins that enable the exchange of small polar molecules. Mutations in porins contribute to the development of drug-resistant phenotypes. In this work, we show that a single point mutation in the porin PorB from Neisseria meningitidis, the causative agent of bacterial meningitis, can strongly affect the binding and permeation of beta-lactam antibiotics. Using X-ray crystallography, high-resolution electrophysiology, atomistic biomolecular simulation, and liposome swelling experiments, we demonstrate differences in drug binding affinity, ion selectivity and drug permeability of PorB. Our work further reveals distinct interactions between the transversal electric field in the porin eyelet and the zwitterionic drugs, which manifest themselves under applied electric fields in electrophysiology and are altered by the mutation. These observations may apply more broadly to drug-porin interactions in other channels. Our results improve the molecular understanding of porin-based drug-resistance in Gram-negative bacteria.

  • Organizational Affiliation

    Institute of Organic and Biomolecular Chemistry, University of Göttingen, Tammannstraße 2, 37077 Göttingen, Germany.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Outer membrane proteinA [auth X]355Neisseria meningitidisMutation(s): 1 
Membrane Entity: Yes 
Find proteins for M4GGR4 (Neisseria meningitidis)
Explore M4GGR4 
Go to UniProtKB:  M4GGR4
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupM4GGR4
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.76 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.213 
  • Space Group: P 63
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 84.396α = 90
b = 84.396β = 90
c = 107.11γ = 120
Software Package:
Software NamePurpose
HKL-2000data reduction
SCALEPACKdata scaling

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
German Federal Ministry for Education and ResearchGermany03Z2HN21
Japan Society for the Promotion of Science (JSPS)Japan16K18506

Revision History  (Full details and data files)

  • Version 1.0: 2021-03-31
    Type: Initial release
  • Version 1.1: 2023-11-29
    Changes: Data collection, Database references, Derived calculations, Refinement description