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- EMDB-30018: Structure of the BAM complex -

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Basic information

Entry
Database: EMDB / ID: EMD-30018
TitleStructure of the BAM complex
Map dataStructure of the BAM complex
Sample
  • Complex: B-barrel assembly machinery (BAM) complex
    • 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
Keywordsb-barrel assembly machinery (BAM) complex / 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 / 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 K-12 (bacteria) / Escherichia coli (strain K12) (bacteria)
Methodsingle particle reconstruction / cryo EM / Resolution: 4.2 Å
AuthorsXiao L / Huang Y
CitationJournal: FASEB J / Year: 2021
Title: Structures of the β-barrel assembly machine recognizing outer membrane protein substrates.
Authors: Le Xiao / Long Han / Bufan Li / Manfeng Zhang / Haizhen Zhou / Qingshan Luo / Xinzheng Zhang / Yihua Huang /
Abstract: β-barrel outer membrane proteins (β-OMPs) play critical roles in nutrition acquisition, protein import/export, and other fundamental biological processes. The assembly of β-OMPs in Gram-negative ...β-barrel outer membrane proteins (β-OMPs) play critical roles in nutrition acquisition, protein import/export, and other fundamental biological processes. The assembly of β-OMPs in Gram-negative bacteria is mediated by the β-barrel assembly machinery (BAM) complex, yet its precise mechanism remains elusive. Here, we report two structures of the BAM complex in detergents and in nanodisks, and two crystal structures of the BAM complex with bound substrates. Structural analysis indicates that the membrane compositions surrounding the BAM complex could modulate its overall conformations, indicating low energy barriers between different conformational states and a highly dynamic nature of the BAM complex. Importantly, structures of the BAM complex with bound substrates and the related functional analysis show that the first β-strand of the BamA β-barrel (β1 ) in the BAM complex is associated with the last but not the first β-strand of a β-OMP substrate via antiparallel β-strand interactions. These observations are consistent with the β-signal hypothesis during β-OMP biogenesis, and suggest that the β1 strand in the BAM complex may interact with the last β-strand of an incoming β-OMP substrate upon their release from the chaperone-bound state.
History
DepositionFeb 15, 2020-
Header (metadata) releaseJan 13, 2021-
Map releaseJan 13, 2021-
UpdateJul 2, 2025-
Current statusJul 2, 2025Processing site: PDBj / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.0126
  • Imaged by UCSF Chimera
  • Download
  • Surface view colored by height
  • Surface level: 0.0126
  • Imaged by UCSF Chimera
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  • Surface view with fitted model
  • Atomic models: PDB-6lyu
  • Surface level: 0.0126
  • Imaged by UCSF Chimera
  • Download
Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_30018.png

Downloads & links

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Map

FileDownload / File: emd_30018.map.gz / Format: CCP4 / Size: 98.9 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationStructure of the BAM complex
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1 Å/pix.
x 296 pix.
= 296. Å		1 Å/pix.
x 296 pix.
= 296. Å		1 Å/pix.
x 296 pix.
= 296. Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.0126 / Movie #1: 0.0126
Minimum - Maximum-0.019826006 - 0.04883434
Average (Standard dev.)-0.00006903751 (±0.0014473838)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions296296296
Spacing296296296
CellA=B=C: 296.0 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z111
M x/y/z296296296
origin x/y/z0.0000.0000.000
length x/y/z296.000296.000296.000
α/β/γ90.00090.00090.000
start NX/NY/NZ000
NX/NY/NZ300300300
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS296296296
D min/max/mean-0.0200.049-0.000

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Supplemental data

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Sample components

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Entire : B-barrel assembly machinery (BAM) complex

EntireName: B-barrel assembly machinery (BAM) complex
Components
  • Complex: B-barrel assembly machinery (BAM) complex
    • 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

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Supramolecule #1: B-barrel assembly machinery (BAM) complex

SupramoleculeName: B-barrel assembly machinery (BAM) complex / 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 (strain K12) (bacteria)
Molecular weightTheoretical: 90.643383 KDa
Recombinant expressionOrganism: Escherichia coli K-12 (bacteria)
SequenceString: MAMKKLLIAS LLFSSATVYG AEGFVVKDIH FEGLQRVAVG AALLSMPVRT GDTVNDEDIS NTIRALFATG NFEDVRVLRD GDTLLVQVK ERPTIASITF SGNKSVKDDM LKQNLEASGV RVGESLDRTT IADIEKGLED FYYSVGKYSA SVKAVVTPLP R NRVDLKLV ...String:
MAMKKLLIAS LLFSSATVYG AEGFVVKDIH FEGLQRVAVG AALLSMPVRT GDTVNDEDIS NTIRALFATG NFEDVRVLRD GDTLLVQVK ERPTIASITF SGNKSVKDDM LKQNLEASGV RVGESLDRTT IADIEKGLED FYYSVGKYSA SVKAVVTPLP R NRVDLKLV FQEGVSAEIQ QINIVGNHAF TTDELISHFQ LRDEVPWWNV VGDRKYQKQK LAGDLETLRS YYLDRGYARF NI DSTQVSL TPDKKGIYVT VNITEGDQYK LSGVEVSGNL AGHSAEIEQL TKIEPGELYN GTKVTKMEDD IKKLLGRYGY AYP RVQSMP EINDADKTVK LRVNVDAGNR FYVRKIRFEG NDTSKDAVLR REMRQMEGAW LGSDLVDQGK ERLNRLGFFE TVDT DTQRV PGSPDQVDVV YKVKERNTGS FNFGIGYGTE SGVSFQAGVQ QDNWLGTGYA VGINGTKNDY QTYAELSVTN PYFTV DGVS LGGRLFYNDF QADDADLSDY TNKSYGTDVT LGFPINEYNS LRAGLGYVHN SLSNMQPQVA MWRYLYSMGE HPSTSD QDN SFKTDDFTFN YGWTYNKLDR GYFPTDGSRV NLTGKVTIPG SDNEYYKVTL DTATYVPIDD DHKWVVLGRT RWGYGDG LG GKEMPFYENF YAGGSSTVRG FQSNTIGPKA VYFPHQASNY DPDYDYECAT QDGAKDLCKS DDAVGGNAMA VASLEFIT P TPFISDKYAN SVRTSFFWDM GTVWDTNWDS SQYSGYPDYS DPSNIRMSAG IALQWMSPLG PLVFSYAQPF KKYDGDKAE QFQFNIGKTW

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 (strain K12) (bacteria)
Molecular weightTheoretical: 42.961086 KDa
Recombinant expressionOrganism: Escherichia coli K-12 (bacteria)
SequenceString: MQLRKLLLPG LLSVTLLSGC SLFNSEEDVV KMSPLPTVEN QFTPTTAWST SVGSGIGNFY SNLHPALADN VVYAADRAGL VKALNADDG KEIWSVSLAE KDGWFSKEPA LLSGGVTVSG GHVYIGSEKA QVYALNTSDG TVAWQTKVAG EALSRPVVSD G LVLIHTSN ...String:
MQLRKLLLPG LLSVTLLSGC SLFNSEEDVV KMSPLPTVEN QFTPTTAWST SVGSGIGNFY SNLHPALADN VVYAADRAGL VKALNADDG KEIWSVSLAE KDGWFSKEPA LLSGGVTVSG GHVYIGSEKA QVYALNTSDG TVAWQTKVAG EALSRPVVSD G LVLIHTSN GQLQALNEAD GAVKWTVNLD MPSLSLRGES APTTAFGAAV VGGDNGRVSA VLMEQGQMIW QQRISQATGS TE IDRLSDV DTTPVVVNGV VFALAYNGNL TALDLRSGQI MWKRELGSVN DFIVDGNRIY LVDQNDRVMA LTIDGGVTLW TQS DLLHRL LTSPVLYNGN LVVGDSEGYL HWINVEDGRF VAQQKVDSSG FQTEPVAADG KLLIQAKDGT VYSITRWSHP QFEK

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 (strain K12) (bacteria)
Molecular weightTheoretical: 36.875277 KDa
Recombinant expressionOrganism: Escherichia coli K-12 (bacteria)
SequenceString: MAYSVQKSRL AKVAGVSLVL LLAACSSDSR YKRQVSGDEA YLEAAPLAEL HAPAGMILPV TSGDYAIPVT NGSGAVGKAL DIRPPAQPL ALVSGARTQF TGDTASLLVE NGRGNTLWPQ VVSVLQAKNY TITQRDDAGQ TLTTDWVQWN RLDEDEQYRG R YQISVKPQ ...String:
MAYSVQKSRL AKVAGVSLVL LLAACSSDSR YKRQVSGDEA YLEAAPLAEL HAPAGMILPV TSGDYAIPVT NGSGAVGKAL DIRPPAQPL ALVSGARTQF TGDTASLLVE NGRGNTLWPQ VVSVLQAKNY TITQRDDAGQ TLTTDWVQWN RLDEDEQYRG R YQISVKPQ GYQQAVTVKL LNLEQAGKPV ADAASMQRYS TEMMNVISAG LDKSATDAAN AAQNRASTTM DVQSAADDTG LP MLVVRGP FNVVWQRLPA ALEKVGMKVT DSTRSQGNMA VTYKPLSDSD WQELGASDPG LASGDYKLQV GDLDNRSSLQ FID PKGHTL TQSQNDALVA VFQAAFSK

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 (strain K12) (bacteria)
Molecular weightTheoretical: 27.85835 KDa
Recombinant expressionOrganism: Escherichia coli K-12 (bacteria)
SequenceString: MTRMKYLVAA ATLSLFLAGC SGSKEEVPDN PPNEIYATAQ QKLQDGNWRQ AITQLEALDN RYPFGPYSQQ VQLDLIYAYY KNADLPLAQ AAIDRFIRLN PTHPNIDYVM YMRGLTNMAL DDSALQGFFG VDRSDRDPQH ARAAFSDFSK LVRGYPNSQY T TDATKRLV ...String:
MTRMKYLVAA ATLSLFLAGC SGSKEEVPDN PPNEIYATAQ QKLQDGNWRQ AITQLEALDN RYPFGPYSQQ VQLDLIYAYY KNADLPLAQ AAIDRFIRLN PTHPNIDYVM YMRGLTNMAL DDSALQGFFG VDRSDRDPQH ARAAFSDFSK LVRGYPNSQY T TDATKRLV FLKDRLAKYE YSVAEYYTER GAWVAVVNRV EGMLRDYPDT QATRDALPLM ENAYRQMQMN AQAEKVAKII AA NSSNT

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 (strain K12) (bacteria)
Molecular weightTheoretical: 13.139857 KDa
Recombinant expressionOrganism: Escherichia coli K-12 (bacteria)
SequenceString:
MRCKTLTAAA AVLLMLTAGC STLERVVYRP DINQGNYLTA NDVSKIRVGM TQQQVAYALG TPLMSDPFGT NTWFYVFRQQ PGHEGVTQQ TLTLTFNSSG VLTNIDNKPA LSGNHHHHHH

UniProtKB: Outer membrane protein assembly factor BamE

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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

Concentration0.8 mg/mL
BufferpH: 8
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TALOS ARCTICA
Image recordingFilm or detector model: GATAN K2 SUMMIT (4k x 4k) / Average electron dose: 50.0 e/Å2
Electron beamAcceleration voltage: 200 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD
Experimental equipment
Model: Talos Arctica / Image courtesy: FEI Company

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Image processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: EMDB MAP
Final reconstructionResolution.type: BY AUTHOR / Resolution: 4.2 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 395915
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD

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