The crystal structure of BamA from Neisseria gonorrhoeae

Experimental Data Snapshot

  • Resolution: 3.20 Å
  • R-Value Free: 0.278 
  • R-Value Work: 0.232 
  • R-Value Observed: 0.236 

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Structural insight into the biogenesis of beta-barrel membrane proteins.

Noinaj, N.Kuszak, A.J.Gumbart, J.C.Lukacik, P.Chang, H.Easley, N.C.Lithgow, T.Buchanan, S.K.

(2013) Nature 501: 385-390

  • DOI: https://doi.org/10.1038/nature12521
  • Primary Citation of Related Structures:  
    4K3B, 4K3C

  • PubMed Abstract: 

    β-barrel membrane proteins are essential for nutrient import, signalling, motility and survival. In Gram-negative bacteria, the β-barrel assembly machinery (BAM) complex is responsible for the biogenesis of β-barrel membrane proteins, with homologous complexes found in mitochondria and chloroplasts. Here we describe the structure of BamA, the central and essential component of the BAM complex, from two species of bacteria: Neisseria gonorrhoeae and Haemophilus ducreyi. BamA consists of a large periplasmic domain attached to a 16-strand transmembrane β-barrel domain. Three structural features shed light on the mechanism by which BamA catalyses β-barrel assembly. First, the interior cavity is accessible in one BamA structure and conformationally closed in the other. Second, an exterior rim of the β-barrel has a distinctly narrowed hydrophobic surface, locally destabilizing the outer membrane. And third, the β-barrel can undergo lateral opening, suggesting a route from the interior cavity in BamA into the outer membrane.

  • Organizational Affiliation

    National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Outer membrane protein assembly factor BamA792Neisseria gonorrhoeae FA 1090Mutation(s): 0 
Gene Names: bamANGO1801
Membrane Entity: Yes 
Find proteins for Q5F5W8 (Neisseria gonorrhoeae (strain ATCC 700825 / FA 1090))
Explore Q5F5W8 
Go to UniProtKB:  Q5F5W8
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ5F5W8
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 3.20 Å
  • R-Value Free: 0.278 
  • R-Value Work: 0.232 
  • R-Value Observed: 0.236 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 59.525α = 90
b = 270.206β = 90
c = 190.618γ = 90
Software Package:
Software NamePurpose
SERGUIdata collection
PHENIXmodel building
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-09-04
    Type: Initial release
  • Version 1.1: 2013-09-11
    Changes: Database references
  • Version 1.2: 2013-10-02
    Changes: Database references
  • Version 1.3: 2024-02-28
    Changes: Data collection, Database references