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- PDB-9h84: BAM-hinge (LVPR) -

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Basic information

Entry
Database: PDB / ID: 9h84
TitleBAM-hinge (LVPR)
Components
  • Outer membrane protein assembly factor BamA
  • Outer membrane protein assembly factor BamB
  • Outer membrane protein assembly factor BamC
  • Outer membrane protein assembly factor BamD
  • Outer membrane protein assembly factor BamE
KeywordsMEMBRANE PROTEIN / Outer membrane / folding / OMP
Function / homology
Function and homology information


Bam protein complex / Gram-negative-bacterium-type cell outer membrane assembly / protein insertion into membrane / cell outer membrane / protein-macromolecule adaptor activity / cell adhesion / cell surface / identical protein binding / membrane
Similarity search - Function
Outer membrane protein assembly factor BamB / Outer membrane protein assembly factor BamC / NlpB/DapX lipoprotein / Outer membrane protein assembly factor BamC, C-terminal / NlpB/DapX lipoprotein / Outer membrane protein assembly factor BamB / Outer membrane protein assembly factor BamE / Lipoprotein SmpA/OmlA / Outer membrane protein assembly factor BamE domain / Outer membrane protein assembly factor BamD ...Outer membrane protein assembly factor BamB / Outer membrane protein assembly factor BamC / NlpB/DapX lipoprotein / Outer membrane protein assembly factor BamC, C-terminal / NlpB/DapX lipoprotein / Outer membrane protein assembly factor BamB / Outer membrane protein assembly factor BamE / Lipoprotein SmpA/OmlA / Outer membrane protein assembly factor BamE domain / Outer membrane protein assembly factor BamD / Outer membrane lipoprotein BamD-like / Outer membrane lipoprotein / BamE-like / Pyrrolo-quinoline quinone repeat / Outer membrane protein assembly factor BamA / POTRA domain, BamA/TamA-like / Surface antigen variable number repeat / Surface antigen D15-like / Pyrrolo-quinoline quinone beta-propeller repeat / beta-propeller repeat / POTRA domain / POTRA domain profile. / Bacterial surface antigen (D15) / Omp85 superfamily domain / Quinoprotein alcohol dehydrogenase-like superfamily / Prokaryotic membrane lipoprotein lipid attachment site profile. / Tetratricopeptide-like helical domain superfamily / WD40/YVTN repeat-like-containing domain superfamily
Similarity search - Domain/homology
Outer membrane protein assembly factor BamC / Outer membrane protein assembly factor BamE / Outer membrane protein assembly factor BamA / Outer membrane protein assembly factor BamD / Outer membrane protein assembly factor BamB
Similarity search - Component
Biological speciesEscherichia coli (E. coli)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 4.3 Å
AuthorsMachin, J.M. / Ranson, N.A.
Funding support United Kingdom, 2items
OrganizationGrant numberCountry
Wellcome Trust222373/Z/21/Z United Kingdom
Medical Research Council (MRC, United Kingdom)MR/Y012453/1 United Kingdom
CitationJournal: Nat Commun / Year: 2025
Title: Molecular insights into how the motions of the β-barrel and POTRA domains of BamA are coupled for efficient function.
Authors: Naemi Csoma / Jonathan M Machin / James M Whitehouse / Raquel Rodrìguez-Alonso / Monika Olejnik / Adam K Cahill / Seung-Hyun Cho / Till F Schäberle / Bogdan I Iorga / Neil A Ranson / ...Authors: Naemi Csoma / Jonathan M Machin / James M Whitehouse / Raquel Rodrìguez-Alonso / Monika Olejnik / Adam K Cahill / Seung-Hyun Cho / Till F Schäberle / Bogdan I Iorga / Neil A Ranson / Sheena E Radford / Antonio N Calabrese / Jean-François Collet /
Abstract: The β-barrel assembly machinery (BAM) inserts β-barrel proteins into the outer membrane of Gram-negative bacteria, forming an essential permeability barrier. The core BAM component, BamA, is a β- ...The β-barrel assembly machinery (BAM) inserts β-barrel proteins into the outer membrane of Gram-negative bacteria, forming an essential permeability barrier. The core BAM component, BamA, is a β-barrel protein with an N-terminal periplasmic extension comprising five polypeptide transport-associated (POTRA) domains. Whilst BamA's structure is well characterised, it remains unclear how β-barrel and POTRA domain motions are coordinated. Using BamA variants with mutations in the hinge region between these two domains, we demonstrate that hinge flexibility is required for BAM function. Cryo-electron microscopy suggests that hinge rigidity impairs function by structurally decoupling these domains. A screen for spontaneous suppressors identified a mutation at position T434 in an extracellular loop of BamA, which has been previously shown to suppress BAM defects. Studying this variant provides insights into its function as a general rescue mechanism. Our findings underscore how BamA's sequence has been evolutionarily optimised for efficient function.
History
DepositionOct 28, 2024Deposition site: PDBE / Processing site: PDBE
Revision 1.0Oct 22, 2025Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: Outer membrane protein assembly factor BamA
B: Outer membrane protein assembly factor BamB
C: Outer membrane protein assembly factor BamC
D: Outer membrane protein assembly factor BamD
E: Outer membrane protein assembly factor BamE


Theoretical massNumber of molelcules
Total (without water)162,8905
Polymers162,8905
Non-polymers00
Water00
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1

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Components

#1: Protein Outer membrane protein assembly factor BamA / Omp85


Mass: 81203.562 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Details: Insertion of LVPR linker in the hinge region (before G410)
Source: (gene. exp.) Escherichia coli (E. coli) / Gene: bamA, yaeT, yzzN, yzzY, b0177, JW0172 / Production host: Escherichia coli BL21(DE3) (bacteria) / References: UniProt: P0A940
#2: Protein Outer membrane protein assembly factor BamB


Mass: 39692.156 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia coli (E. coli) / Gene: bamB, yfgL, b2512, JW2496 / Production host: Escherichia coli BL21(DE3) (bacteria) / References: UniProt: P77774
#3: Protein Outer membrane protein assembly factor BamC


Mass: 6884.758 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia coli (E. coli) / Gene: bamC, dapX, nlpB, b2477, JW2462 / Production host: Escherichia coli BL21(DE3) (bacteria) / References: UniProt: P0A903
#4: Protein Outer membrane protein assembly factor BamD


Mass: 25008.967 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia coli (E. coli) / Gene: bamD, yfiO, Z3889, ECs3458 / Production host: Escherichia coli BL21(DE3) (bacteria) / References: UniProt: P0AC04
#5: Protein Outer membrane protein assembly factor BamE


Mass: 10100.229 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia coli (E. coli) / Gene: bamE, smpA, c3139 / Production host: Escherichia coli BL21(DE3) (bacteria) / References: UniProt: P0A938
Has protein modificationY

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: BAM (beta-barrel assembly machinery) complex with BamA LVPR insertion
Type: COMPLEX / Details: Purified as a complex with the insertion / Entity ID: all / Source: RECOMBINANT
Molecular weightExperimental value: NO
Source (natural)Organism: Escherichia coli (E. coli)
Source (recombinant)Organism: Escherichia coli (E. coli) / Strain: BL21 (DE3)
Buffer solutionpH: 8
SpecimenConc.: 3.3 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportDetails: 60 mA / Grid material: COPPER / Grid mesh size: 300 divisions/in. / Grid type: Quantifoil R1.2/1.3
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 277 K

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: TFS KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 3000 nm / Nominal defocus min: 900 nm
Specimen holderCryogen: NITROGEN
Image recordingElectron dose: 35.7 e/Å2 / Film or detector model: FEI FALCON IV (4k x 4k)

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Processing

EM software
IDNameVersionCategory
9RELION4initial Euler assignment
10RELION4final Euler assignment
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 4.3 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 127056 / Symmetry type: POINT
Atomic model buildingDetails: Fitting was done in ISOLDE and the models manually adjusted in coot, coupled with phenix real-space refine minimisation.

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