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- EMDB-48254: beta-barrel assembly machine from Escherichia coli in a middle st... -

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Basic information

Entry
Database: EMDB / ID: EMD-48254
Titlebeta-barrel assembly machine from Escherichia coli in a middle state of substrate assembly
Map databeta-barrel assembly machine from Escherichia coli in a middle state of substrate assembly
Sample
  • Complex: BamABCDE bound to BamA substrate in a middle folding intermediate state
    • Protein or peptide: Outer membrane protein assembly factor BamA
    • Protein or peptide: Outer membrane protein assembly factor BamB
    • Protein or peptide: Outer membrane protein assembly factor BamC
    • Protein or peptide: Outer membrane protein assembly factor BamD
    • Protein or peptide: Outer membrane protein assembly factor BamE
    • Protein or peptide: Outer membrane protein assembly factor BamA
    • RNA: Unknown peptide
Keywordsbeta-barrel assembly machine / outer membrane / folding intermediate / MEMBRANE PROTEIN
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 / response to antibiotic / 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 / Pyrrolo-quinoline quinone beta-propeller repeat / beta-propeller repeat / Surface antigen D15-like / 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 K-12 (bacteria)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.3 Å
AuthorsThomson BD / Kahne D
Funding support United States, 2 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)R01AI081059 United States
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)U19AI158028 United States
CitationJournal: bioRxiv / Year: 2025
Title: Structures of folding intermediates on BAM show diverse substrates fold by a uniform mechanism.
Authors: Benjamin D Thomson / Melissa D Marquez / Shaun Rawson / Thiago M A Dos Santos / Stephen C Harrison / Daniel Kahne
Abstract: The outer membranes of mitochondria, chloroplasts, and Gram-negative bacteria contain β-barrel membrane proteins that are assembled by conserved multi-subunit machines. In bacteria, the β-barrel ...The outer membranes of mitochondria, chloroplasts, and Gram-negative bacteria contain β-barrel membrane proteins that are assembled by conserved multi-subunit machines. In bacteria, the β-barrel assembly machine (BAM) folds over a hundred compositionally different substrates into barrels that vary greatly in size. Some larger barrels require globular proteins to plug the barrel lumen. How a single machine can assemble such different barrels is unknown. Here we report three structures representing progressively folded stages of a 16-stranded barrel engaged with BAM, as well as the structure of a late-stage folding intermediate of a 26-stranded substrate folding around its soluble lipoprotein plug on BAM. We find that BAM catalyzes folding of these substrates by a uniform mechanism in which BAM undergoes major distortions to accommodate the nascent barrel.
History
DepositionDec 10, 2024-
Header (metadata) releaseDec 17, 2025-
Map releaseDec 17, 2025-
UpdateDec 24, 2025-
Current statusDec 24, 2025Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_48254.png

Downloads & links

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Map

FileDownload / File: emd_48254.map.gz / Format: CCP4 / Size: 125 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Annotationbeta-barrel assembly machine from Escherichia coli in a middle state of substrate assembly
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.83 Å/pix.
x 320 pix.
= 265.6 Å		0.83 Å/pix.
x 320 pix.
= 265.6 Å		0.83 Å/pix.
x 320 pix.
= 265.6 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 0.83 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.029
Minimum - Maximum-0.21344209 - 0.3385314
Average (Standard dev.)0.00023719795 (±0.0060255677)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions320320320
Spacing320320320
CellA=B=C: 265.6 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: Half map A

Fileemd_48254_half_map_1.map
AnnotationHalf map A
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: Half map B

Fileemd_48254_half_map_2.map
AnnotationHalf map B
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : BamABCDE bound to BamA substrate in a middle folding intermediate...

EntireName: BamABCDE bound to BamA substrate in a middle folding intermediate state
Components
  • Complex: BamABCDE bound to BamA substrate in a middle folding intermediate state
    • Protein or peptide: Outer membrane protein assembly factor BamA
    • Protein or peptide: Outer membrane protein assembly factor BamB
    • Protein or peptide: Outer membrane protein assembly factor BamC
    • Protein or peptide: Outer membrane protein assembly factor BamD
    • Protein or peptide: Outer membrane protein assembly factor BamE
    • Protein or peptide: Outer membrane protein assembly factor BamA
    • RNA: Unknown peptide

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Supramolecule #1: BamABCDE bound to BamA substrate in a middle folding intermediate...

SupramoleculeName: BamABCDE bound to BamA substrate in a middle folding intermediate state
type: complex / ID: 1 / Parent: 0 / Macromolecule list: all
Source (natural)Organism: Escherichia coli K-12 (bacteria)

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Macromolecule #1: Outer membrane protein assembly factor BamA

MacromoleculeName: Outer membrane protein assembly factor BamA / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Escherichia coli K-12 (bacteria)
Molecular weightTheoretical: 88.502797 KDa
Recombinant expressionOrganism: Escherichia coli BL21(DE3) (bacteria)
SequenceString: AEGFVVKDIH FEGLQRVAVG AALLSMPVRT GDTVNDEDIS NTIRALFATG NFEDVRVLRD GDTLLVQVKE RPTIASITFS GNKSVKDDM LKQNLEASGV RVGESLDRTT IADIEKGLED FYYSVGKYSA SVKAVVTPLP RNRVDLKLVF QEGVSAEIQQ I NIVGNHAF ...String:
AEGFVVKDIH FEGLQRVAVG AALLSMPVRT GDTVNDEDIS NTIRALFATG NFEDVRVLRD GDTLLVQVKE RPTIASITFS GNKSVKDDM LKQNLEASGV RVGESLDRTT IADIEKGLED FYYSVGKYSA SVKAVVTPLP RNRVDLKLVF QEGVSAEIQQ I NIVGNHAF TTDELISHFQ LRDEVPWWNV VGDRKYQKQK LAGDLETLRS YYLDRGYARF NIDSTQVSLT PDKKGIYVTV NI TEGDQYK LSGVEVSGNL AGHSAEIEQL TKIEPGELYN GTKVTKMEDD IKKLLGRYGY AYPRVQSMPE INDADKTVKL RVN VDAGNR FYVRKIRFEG NDTSKDAVLR REMRQMEGAW LGSDLVDQGK ERLNRLGFFE TVDTDTQRVP GSPDQVDVVY KVKE RNTGS FNFGIGYGTE SGVSFQAGVQ QDNWLGTGYA VGINGTKNDY QTYAELSVTN PYFTVDGVSL GGRLFYNDFQ ADDAD LSDY TNKSYGTCVT LGFPINEYNS LRAGLGYVHN SLSNMQPQVA MWRYLYSMGE HPSTSDQDNS FKTDDFTFNY GWTYNK LDR GYFPTDGSRV NLTGKVTIPG SDNEYYKVTL DTATYVPIDD DHKWVVLGRT RWGYGDGLGG KEMPFYENFY AGGSSTV RG FQSNTIGPKA VYFPHQASNY DPDYDYECAT QDGAKDLCKS DDAVGGNAMA VASLEFITPT PFISDKYANS VRTSFFWD M GTVWDTNWDS SQYSGYPDYS DPSNIRMSAG IALQWMSPLG PLVFSYAQPF KKYDGDKAEQ FQFNIGKTW

UniProtKB: Outer membrane protein assembly factor BamA

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Macromolecule #2: Outer membrane protein assembly factor BamB

MacromoleculeName: Outer membrane protein assembly factor BamB / type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Escherichia coli K-12 (bacteria)
Molecular weightTheoretical: 39.882375 KDa
Recombinant expressionOrganism: Escherichia coli BL21(DE3) (bacteria)
SequenceString: CSLFNSEEDV VKMSPLPTVE NQFTPTTAWS TSVGSGIGNF YSNLHPALAD NVVYAADRAG LVKALNADDG KEIWSVSLAE KDGWFSKEP ALLSGGVTVS GGHVYIGSEK AQVYALNTSD GTVAWQTKVA GEALSRPVVS DGLVLIHTSN GQLQALNEAD G AVKWTVNL ...String:
CSLFNSEEDV VKMSPLPTVE NQFTPTTAWS TSVGSGIGNF YSNLHPALAD NVVYAADRAG LVKALNADDG KEIWSVSLAE KDGWFSKEP ALLSGGVTVS GGHVYIGSEK AQVYALNTSD GTVAWQTKVA GEALSRPVVS DGLVLIHTSN GQLQALNEAD G AVKWTVNL DMPSLSLRGE SAPTTAFGAA VVGGDNGRVS AVLMEQGQMI WQQRISQATG STEIDRLSDV DTTPVVVNGV VF ALAYNGN LTALDLRSGQ IMWKRELGSV NDFIVDGNRI YLVDQNDRVM ALTIDGGVTL WTQSDLLHRL LTSPVLYNGN LVV GDSEGY LHWINVEDGR FVAQQKVDSS GFQTEPVAAD GKLLIQAKDG TVYSITR

UniProtKB: Outer membrane protein assembly factor BamB

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Macromolecule #3: Outer membrane protein assembly factor BamC

MacromoleculeName: Outer membrane protein assembly factor BamC / type: protein_or_peptide / ID: 3 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Escherichia coli K-12 (bacteria)
Molecular weightTheoretical: 34.40125 KDa
Recombinant expressionOrganism: Escherichia coli BL21(DE3) (bacteria)
SequenceString: CSSDSRYKRQ VSGDEAYLEA APLAELHAPA GMILPVTSGD YAIPVTNGSG AVGKALDIRP PAQPLALVSG ARTQFTGDTA SLLVENGRG NTLWPQVVSV LQAKNYTITQ RDDAGQTLTT DWVQWNRLDE DEQYRGRYQI SVKPQGYQQA VTVKLLNLEQ A GKPVADAA ...String:
CSSDSRYKRQ VSGDEAYLEA APLAELHAPA GMILPVTSGD YAIPVTNGSG AVGKALDIRP PAQPLALVSG ARTQFTGDTA SLLVENGRG NTLWPQVVSV LQAKNYTITQ RDDAGQTLTT DWVQWNRLDE DEQYRGRYQI SVKPQGYQQA VTVKLLNLEQ A GKPVADAA SMQRYSTEMM NVISAGLDKS ATDAANAAQN RASTTMDVQS AADDTGLPML VVRGPFNVVW QRLPAALEKV GM KVTDSTR SQGNMAVTYK PLSDSDWQEL GASDPGLASG DYKLQVGDLD NRSSLQFIDP KGHTLTQSQN DALVAVFQAA FSK

UniProtKB: Outer membrane protein assembly factor BamC

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Macromolecule #4: Outer membrane protein assembly factor BamD

MacromoleculeName: Outer membrane protein assembly factor BamD / type: protein_or_peptide / ID: 4 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Escherichia coli K-12 (bacteria)
Molecular weightTheoretical: 25.816818 KDa
Recombinant expressionOrganism: Escherichia coli BL21(DE3) (bacteria)
SequenceString: CSGSKEEVPD NPPNEIYATA QQKLQDGNWR QAITQLEALD NRYPFGPYSQ QVQLDLIYAY YKNADLPLAQ AAIDRFIRLN PTHPNIDYV MYMRGLTNMA LDDSALQGFF GVDRSDRDPQ HARAAFSDFS KLVRGYPNSQ YTTDATKRLV FLKDRLAKYE Y SVAEYYTE ...String:
CSGSKEEVPD NPPNEIYATA QQKLQDGNWR QAITQLEALD NRYPFGPYSQ QVQLDLIYAY YKNADLPLAQ AAIDRFIRLN PTHPNIDYV MYMRGLTNMA LDDSALQGFF GVDRSDRDPQ HARAAFSDFS KLVRGYPNSQ YTTDATKRLV FLKDRLAKYE Y SVAEYYTE RGAWVAVVNR VEGMLRDYPD TQATRDALPL MENAYRQMQM NAQAEKVAKI IAANSSNT

UniProtKB: Outer membrane protein assembly factor BamD

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Macromolecule #5: Outer membrane protein assembly factor BamE

MacromoleculeName: Outer membrane protein assembly factor BamE / type: protein_or_peptide / ID: 5 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Escherichia coli K-12 (bacteria)
Molecular weightTheoretical: 11.610833 KDa
Recombinant expressionOrganism: Escherichia coli BL21(DE3) (bacteria)
SequenceString:
CSTLERVVYR PDINQGNYLT ANDVSKIRVG MTQQQVAYAL GTPLMSDPFG TNTWFYVFRQ QPGHEGVTQQ TLTLTFNSSG VLTNIDNKP ALSGNGGHHH HHHHH

UniProtKB: Outer membrane protein assembly factor BamE

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Macromolecule #6: Outer membrane protein assembly factor BamA

MacromoleculeName: Outer membrane protein assembly factor BamA / type: protein_or_peptide / ID: 6 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Escherichia coli K-12 (bacteria)
Molecular weightTheoretical: 62.90882 KDa
Recombinant expressionOrganism: Escherichia coli BL21(DE3) (bacteria)
SequenceString: AWSHPQFEKG GGSGGGSGGS AWSHPQFEKE GFVVKDIHFE GLQRVAVGAA LLSMPVRTGD TVNDEDISNT IRALFATGNF EDVRVLRDG DTLLVQVKER PTIASITFSG NKSVKDDMLK QNLEASGVRV GESLDRTTIA DIEKGLEDFY YSVGKYSASV K AVVTPLPR ...String:
AWSHPQFEKG GGSGGGSGGS AWSHPQFEKE GFVVKDIHFE GLQRVAVGAA LLSMPVRTGD TVNDEDISNT IRALFATGNF EDVRVLRDG DTLLVQVKER PTIASITFSG NKSVKDDMLK QNLEASGVRV GESLDRTTIA DIEKGLEDFY YSVGKYSASV K AVVTPLPR NRVDLKLVFQ ENTGSFNFGI GYGTESGVSF QAGVQQDNWL GTGYAVGING TKNDYQTYAE LSVTNPYFTV DG VSLGGRL FYNDFQADDA DLSDYTNKSY GTDVTLGFPI NEYNSLRAGL GYVHNSLSNM QPQVAMWRYL YSMGEHPSTS DQD NSFKTD DFTFNYGWTY NKLDRGYFPT DGSRVNLTCK VTIPGSDNEY YKVTLDTATY VPIDDDHKWV VLGRTRWGYG DGLG GKEMP FYENFYAGGS STVRGFQSNT IGPKAVYFPH QASNYDPDYD YECATQDGAK DLCKSDDAVG GNAMAVASLE FITPT PFIS DKYANSVRTS FFWDMGTVWD TNWDSSQYSG YPDYSDPSNI RMSAGIALQW MSPLGPLVFS YAQPFKKYDG DKAEQF QFN IGKTW

UniProtKB: Outer membrane protein assembly factor BamA, Outer membrane protein assembly factor BamA

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Macromolecule #7: Unknown peptide

MacromoleculeName: Unknown peptide / type: rna / ID: 7 / Number of copies: 1
Source (natural)Organism: Escherichia coli K-12 (bacteria)
Molecular weightTheoretical: 635.881 Da
SequenceString:
(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

Concentration1 mg/mL
BufferpH: 8
Component:
ConcentrationFormulaName
20.0 mMTris-HClTris(hydroxymethyl)aminomethane hydrochloride
150.0 mMNaClSodium chloride
0.02 %GDNGlyco-diosgenin
GridModel: UltrAuFoil R1.2/1.3 / Material: GOLD / Mesh: 300 / Support film - Material: GOLD / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 30 sec. / Pretreatment - Atmosphere: AIR / Pretreatment - Pressure: 0.039 kPa
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK IV

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Electron microscopy

MicroscopeTFS KRIOS
Image recordingFilm or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Number grids imaged: 1 / Number real images: 18537 / Average exposure time: 3.2 sec. / Average electron dose: 53.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsC2 aperture diameter: 50.0 µm / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.4 µm / Nominal defocus min: 1.0 µm / Nominal magnification: 105000
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

CTF correctionSoftware - Name: cryoSPARC / Type: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: OTHER
Details: Ab-initio model generated within cryoSPARC based on the data
Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.3 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC / Number images used: 208738
Initial angle assignmentType: RANDOM ASSIGNMENT / Software - Name: cryoSPARC
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC
FSC plot (resolution estimation)

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Atomic model buiding 1

Initial model
PDB IDChain

5ljo

source_name: PDB, initial_model_type: experimental model

6v05

source_name: PDB, initial_model_type: experimental model
Output model

PDB-9mgf:
beta-barrel assembly machine from Escherichia coli in a middle state of substrate assembly

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