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- EMDB-18035: Wait Complex: Lateral open BAM bound Extended SurA -

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Basic information

Entry
Database: EMDB / ID: EMD-18035
TitleWait Complex: Lateral open BAM bound Extended SurA
Map data
Sample
  • Complex: Wait Complex: Lateral open BAM bound Extended SurA
    • 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: Chaperone SurA
KeywordsOuter Membrane / Complex / Chaperone / Protein Folding / MEMBRANE PROTEIN
Function / homology
Function and homology information


maintenance of stationary phase / maintenance of unfolded protein / Bam protein complex / Gram-negative-bacterium-type cell outer membrane assembly / protein insertion into membrane / chaperone-mediated protein folding / peptidylprolyl isomerase / peptidyl-prolyl cis-trans isomerase activity / cell outer membrane / peptide binding ...maintenance of stationary phase / maintenance of unfolded protein / Bam protein complex / Gram-negative-bacterium-type cell outer membrane assembly / protein insertion into membrane / chaperone-mediated protein folding / peptidylprolyl isomerase / peptidyl-prolyl cis-trans isomerase activity / cell outer membrane / peptide binding / unfolded protein binding / protein folding / outer membrane-bounded periplasmic space / protein-macromolecule adaptor activity / protein stabilization / cell adhesion / response to antibiotic / cell surface / identical protein binding / membrane
Similarity search - Function
Peptidyl-prolyl isomerase SurA / SurA N-terminal / SurA N-terminal domain / : / PPIC-type PPIASE domain / Trigger factor/SurA domain superfamily / Outer membrane protein assembly factor BamB / NlpB/DapX lipoprotein / Outer membrane protein assembly factor BamC / Outer membrane protein assembly factor BamC, C-terminal ...Peptidyl-prolyl isomerase SurA / SurA N-terminal / SurA N-terminal domain / : / PPIC-type PPIASE domain / Trigger factor/SurA domain superfamily / Outer membrane protein assembly factor BamB / NlpB/DapX lipoprotein / Outer membrane protein assembly factor BamC / Outer membrane protein assembly factor BamC, C-terminal / NlpB/DapX lipoprotein / Outer membrane protein assembly factor BamD / Outer membrane protein assembly factor BamE / Lipoprotein SmpA/OmlA / Outer membrane lipoprotein BamD-like / SmpA / OmlA family / Outer membrane lipoprotein / BamE-like / Peptidyl-prolyl cis-trans isomerase, PpiC-type, conserved site / PpiC-type peptidyl-prolyl cis-trans isomerase signature. / Outer membrane protein assembly factor BamA / PPIC-type PPIASE domain / POTRA domain, BamA/TamA-like / Surface antigen variable number repeat / PpiC-type peptidyl-prolyl cis-trans isomerase family profile. / Peptidyl-prolyl cis-trans isomerase, PpiC-type / Pyrrolo-quinoline quinone repeat / PQQ-like domain / POTRA domain / POTRA domain profile. / Surface antigen D15-like / Bacterial surface antigen (D15) / Pyrrolo-quinoline quinone beta-propeller repeat / Omp85 superfamily domain / beta-propeller repeat / Quinoprotein alcohol dehydrogenase-like superfamily / Peptidyl-prolyl cis-trans isomerase domain superfamily / Tetratricopeptide-like helical domain superfamily / Prokaryotic membrane lipoprotein lipid attachment site profile. / 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 / Chaperone SurA / Outer membrane protein assembly factor BamD / Outer membrane protein assembly factor BamB
Similarity search - Component
Biological speciesEscherichia coli (E. coli)
Methodsingle particle reconstruction / cryo EM / Resolution: 4.2 Å
AuthorsFenn KL / Ranson NA
Funding support United Kingdom, 1 items
OrganizationGrant numberCountry
Medical Research Council (MRC, United Kingdom)MR/P018491/1 United Kingdom
CitationJournal: Nat Commun / Year: 2024
Title: Outer membrane protein assembly mediated by BAM-SurA complexes.
Authors: Katherine L Fenn / Jim E Horne / Joel A Crossley / Nils Böhringer / Romany J Horne / Till F Schäberle / Antonio N Calabrese / Sheena E Radford / Neil A Ranson /
Abstract: The outer membrane is a formidable barrier that protects Gram-negative bacteria against environmental threats. Its integrity requires the correct folding and insertion of outer membrane proteins ...The outer membrane is a formidable barrier that protects Gram-negative bacteria against environmental threats. Its integrity requires the correct folding and insertion of outer membrane proteins (OMPs) by the membrane-embedded β-barrel assembly machinery (BAM). Unfolded OMPs are delivered to BAM by the periplasmic chaperone SurA, but how SurA and BAM work together to ensure successful OMP delivery and folding remains unclear. Here, guided by AlphaFold2 models, we use disulphide bond engineering in an attempt to trap SurA in the act of OMP delivery to BAM, and solve cryoEM structures of a series of complexes. The results suggest that SurA binds BAM at its soluble POTRA-1 domain, which may trigger conformational changes in both BAM and SurA that enable transfer of the unfolded OMP to the BAM lateral gate for insertion into the outer membrane. Mutations that disrupt the interaction between BAM and SurA result in outer membrane assembly defects, supporting the key role of SurA in outer membrane biogenesis.
History
DepositionJul 26, 2023-
Header (metadata) releaseSep 25, 2024-
Map releaseSep 25, 2024-
UpdateSep 25, 2024-
Current statusSep 25, 2024Processing site: PDBe / Status: Released

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Structure visualization

Supplemental images

emd_18035.png

Downloads & links

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Map

FileDownload / File: emd_18035.map.gz / Format: CCP4 / Size: 103 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.71 Å/pix.
x 300 pix.
= 213. Å		0.71 Å/pix.
x 300 pix.
= 213. Å		0.71 Å/pix.
x 300 pix.
= 213. Å

Surface

Projections

Slices (1/3)

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Images are generated by Spider.

Voxel sizeX=Y=Z: 0.71 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.00687
Minimum - Maximum-0.020629622 - 0.029451676
Average (Standard dev.)0.00017996323 (±0.0010983432)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions300300300
Spacing300300300
CellA=B=C: 213.0 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: #1

Fileemd_18035_half_map_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: #2

Fileemd_18035_half_map_2.map
Projections & Slices
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Histogram (log scale)

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Sample components

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Entire : Wait Complex: Lateral open BAM bound Extended SurA

EntireName: Wait Complex: Lateral open BAM bound Extended SurA
Components
  • Complex: Wait Complex: Lateral open BAM bound Extended SurA
    • 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: Chaperone SurA

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Supramolecule #1: Wait Complex: Lateral open BAM bound Extended SurA

SupramoleculeName: Wait Complex: Lateral open BAM bound Extended SurA / type: complex / ID: 1 / Parent: 0 / Macromolecule list: all
Details: BamA POTRA1 disulphide bonded to SurA Core domain (BamA R76C, SurA K27C)
Source (natural)Organism: Escherichia coli (E. coli)
Molecular weightTheoretical: 250 KDa

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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 (E. coli)
Molecular weightTheoretical: 88.460688 KDa
Recombinant expressionOrganism: Escherichia coli BL21 (bacteria)
SequenceString: AEGFVVKDIH FEGLQRVAVG AALLSMPVRT GDTVNDEDIS NTIRALFATG NFEDVCVLRD GDTLLVQVKE RPTIASITFS GNKSVKDDM LKQNLEASGV RVGESLDRTT IADIEKGLED FYYSVGKYSA SVKAVVTPLP RNRVDLKLVF QEGVSAEIQQ I NIVGNHAF ...String:
AEGFVVKDIH FEGLQRVAVG AALLSMPVRT GDTVNDEDIS NTIRALFATG NFEDVCVLRD 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 TNKSYGTDVT 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 (E. coli)
Molecular weightTheoretical: 39.882375 KDa
Recombinant expressionOrganism: Escherichia coli BL21 (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 (E. coli)
Molecular weightTheoretical: 34.40125 KDa
Recombinant expressionOrganism: Escherichia coli BL21 (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 (E. coli)
Molecular weightTheoretical: 25.816818 KDa
Recombinant expressionOrganism: Escherichia coli BL21 (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 (E. coli)
Molecular weightTheoretical: 11.610833 KDa
Recombinant expressionOrganism: Escherichia coli BL21 (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: Chaperone SurA

MacromoleculeName: Chaperone SurA / type: protein_or_peptide / ID: 6 / Number of copies: 1 / Enantiomer: LEVO / EC number: peptidylprolyl isomerase
Source (natural)Organism: Escherichia coli (E. coli)
Molecular weightTheoretical: 49.36427 KDa
Recombinant expressionOrganism: Escherichia coli BL21 (bacteria)
SequenceString: GSSAWSHPQF EKGGGSGGGS GGSAWSHPQF EKSSGENLYF QGAPQVVDCV AAVVNNGVVL ESDVDGLMQS VKLNAAQARQ QLPDDATLR HQIMERLIMD QIILQMGQKM GVKISDEQLD QAIANIAKQN NMTLDQMRSR LAYDGLNYNT YRNQIRKEMI I SEVRNNEV ...String:
GSSAWSHPQF EKGGGSGGGS GGSAWSHPQF EKSSGENLYF QGAPQVVDCV AAVVNNGVVL ESDVDGLMQS VKLNAAQARQ QLPDDATLR HQIMERLIMD QIILQMGQKM GVKISDEQLD QAIANIAKQN NMTLDQMRSR LAYDGLNYNT YRNQIRKEMI I SEVRNNEV RRRITILPQE VESLAQQVGN QNDASTELNL SHILIPLPEN PTSDQVNEAE SQARAIVDQA RNGADFGKLA IA HSADQQA LNGGQMGWGR IQELPGIFAQ ALSTAKKGDI VGPIRSGVGF HILKVNDLRG ESKNISVTEV HARHILLKPS PIM TDEQAR VKLEQIAADI KSGKTTFAAA AKEFSQDPGS ANQGGDLGWA TPDIFDPAFR DALTRLNKGQ MSAPVHSSFG WHLI ELLDT RNVDKTDAAQ KDRAYRMLMN RKFSEEAASW MQEQRASAYV KILSN

UniProtKB: Chaperone SurA

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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

Concentration3 mg/mL
BufferpH: 8
GridModel: Quantifoil R1.2/1.3 / Material: COPPER / Mesh: 300 / Pretreatment - Type: PLASMA CLEANING / Pretreatment - Time: 60 sec.
VitrificationCryogen name: ETHANE / Chamber humidity: 90 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK IV

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Electron microscopy

MicroscopeTFS KRIOS
Specialist opticsEnergy filter - Name: TFS Selectris / Energy filter - Slit width: 10 eV
SoftwareName: EPU
Image recordingFilm or detector model: FEI FALCON IV (4k x 4k) / Number grids imaged: 1 / Number real images: 15992 / Average electron dose: 37.9 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 3.0 µm / Nominal defocus min: 0.9 µm / Nominal magnification: 165000
Sample stageSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Particle selectionNumber selected: 662586
Startup modelType of model: INSILICO MODEL
Final reconstructionAlgorithm: FOURIER SPACE / Resolution.type: BY AUTHOR / Resolution: 4.2 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION (ver. 4.0) / Number images used: 60508
Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION (ver. 4.0)
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION (ver. 4.0)
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

1m5y

source_name: PDB, initial_model_type: experimental model
SoftwareName: UCSF ChimeraX / Details: Rigid Body Fit
RefinementSpace: REAL / Protocol: FLEXIBLE FIT / Overall B value: 156 / Target criteria: Cross-correlation coefficient
Output model

PDB-8pz2:
Wait Complex: Lateral open BAM bound Extended SurA

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