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- EMDB-18053: Release Complex: BAM bound EspP and Compact SurA -

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Basic information

Entry
Database: EMDB / ID: EMD-18053
TitleRelease Complex: BAM bound EspP and Compact SurA
Map data
Sample
  • Complex: Release Complex: BAM bound EspP and Compact 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
    • Protein or peptide: Serine protease EspP
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 / Hydrolases; Acting on peptide bonds (peptidases); Serine endopeptidases / chaperone-mediated protein folding / peptidylprolyl isomerase / peptidyl-prolyl cis-trans isomerase activity / cell outer membrane ...maintenance of stationary phase / maintenance of unfolded protein / Bam protein complex / Gram-negative-bacterium-type cell outer membrane assembly / protein insertion into membrane / Hydrolases; Acting on peptide bonds (peptidases); Serine endopeptidases / 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 / periplasmic space / protein stabilization / cell adhesion / response to antibiotic / serine-type endopeptidase activity / cell surface / proteolysis / extracellular region / identical protein binding / membrane
Similarity search - Function
Peptidyl-prolyl isomerase SurA / SurA N-terminal / SurA N-terminal domain / : / PPIC-type PPIASE domain / Peptidase S6, IgA endopeptidase / Peptidase family S6 domain / Immunoglobulin A1 protease / Peptidase family S6 domain profile. / Autotransporter beta-domain ...Peptidyl-prolyl isomerase SurA / SurA N-terminal / SurA N-terminal domain / : / PPIC-type PPIASE domain / Peptidase S6, IgA endopeptidase / Peptidase family S6 domain / Immunoglobulin A1 protease / Peptidase family S6 domain profile. / Autotransporter beta-domain / Trigger factor/SurA domain superfamily / Outer membrane autotransporter barrel / Autotransporter beta-domain / Autotransporter beta-domain profile. / Autotransporter beta-domain / Autotransporter beta-domain superfamily / Autotransporter, pectate lyase C-like 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 / Pectin lyase fold/virulence factor / 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 / Serine protease EspP
Similarity search - Component
Biological speciesEscherichia coli (E. coli)
Methodsingle particle reconstruction / cryo EM / Resolution: 4.3 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 28, 2023-
Header (metadata) releaseOct 2, 2024-
Map releaseOct 2, 2024-
UpdateOct 2, 2024-
Current statusOct 2, 2024Processing site: PDBe / Status: Released

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Structure visualization

Supplemental images

emd_18053.png

Downloads & links

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Map

FileDownload / File: emd_18053.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.)
0.74 Å/pix.
x 300 pix.
= 222. Å		0.74 Å/pix.
x 300 pix.
= 222. Å		0.74 Å/pix.
x 300 pix.
= 222. Å

Surface

Projections

Slices (1/3)

Slices (1/2)

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Images are generated by Spider.

Voxel sizeX=Y=Z: 0.74 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.00387
Minimum - Maximum-0.009087031 - 0.018641649
Average (Standard dev.)0.00012632179 (±0.0007125817)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions300300300
Spacing300300300
CellA=B=C: 222.0 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: #2

Fileemd_18053_half_map_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: #1

Fileemd_18053_half_map_2.map
Projections & Slices
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Slices (1/2)
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Histogram (log scale)

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Sample components

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Entire : Release Complex: BAM bound EspP and Compact SurA

EntireName: Release Complex: BAM bound EspP and Compact SurA
Components
  • Complex: Release Complex: BAM bound EspP and Compact 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
    • Protein or peptide: Serine protease EspP

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Supramolecule #1: Release Complex: BAM bound EspP and Compact SurA

SupramoleculeName: Release Complex: BAM bound EspP and Compact SurA / type: complex / ID: 1 / Parent: 0 / Macromolecule list: all
Details: BamA beta one disulphide bonded to beta signal EspP (BamA S425C, EspP 1299C)
Source (natural)Organism: Escherichia coli (E. coli)
Molecular weightTheoretical: 290 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: 88.530805 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
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 RNTGC 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 (E. coli)
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: 34.359148 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: CSSDSRYSRQ VSGDEAYLEA APLAELHAPA GMILPVTSGD YAIPVTNGSG AVGKALDIRP PAQPLALVSG ARTQFTGDTA SLLVENGRG NTLWPQVVSV LQAKNYTITQ RDDAGQTLTT DWVQWNRLDE DEQYRGRYQI SVKPQGYQQA VTVKLLNLEQ A GKPVADAA ...String:
CSSDSRYSRQ 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 (E. coli)
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 (E. coli)
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 (E. coli)
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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Macromolecule #7: Serine protease EspP

MacromoleculeName: Serine protease EspP / type: protein_or_peptide / ID: 7 / Number of copies: 1 / Enantiomer: LEVO
EC number: Hydrolases; Acting on peptide bonds (peptidases); Serine endopeptidases
Source (natural)Organism: Escherichia coli (E. coli)
Molecular weightTheoretical: 39.834941 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: GGNIELVSAP KDTNENVFKA SKQTIGFSDV TPVITTRETG ENLYFQGGDD KITWSLTGYN TVANKEATRN AAALFSVDYK AFLNEVNNL NKRMGDLRDI NGEAGAWARI MSGTGSASGG FSDNYTHVQV GVDKKHELDG LDLFTGFTVT HTDSSASADV F SGKTKSVG ...String:
GGNIELVSAP KDTNENVFKA SKQTIGFSDV TPVITTRETG ENLYFQGGDD KITWSLTGYN TVANKEATRN AAALFSVDYK AFLNEVNNL NKRMGDLRDI NGEAGAWARI MSGTGSASGG FSDNYTHVQV GVDKKHELDG LDLFTGFTVT HTDSSASADV F SGKTKSVG AGLYASAMFD SGAYIDLIGK YVHHDNEYTA TFAGLGTRDY STHSWYAGAE AGYRYHVTED AWIEPQAELV YG SVSGKQF AWKDQGMHLS MKDKDYNPLI GRTGVDVGKS FSGKDWKVTA RAGLGYQFDL LANGETVLRD ASGEKRIKGE KDS RMLMSV GLNAEIRDNV RFGLEFEKSA FGKYNVDNAV NANFRYCF

UniProtKB: Serine protease EspP

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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
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
Image recordingFilm or detector model: FEI FALCON IV (4k x 4k) / Number grids imaged: 5 / Number real images: 29229 / Average electron dose: 37.4 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: 1491878
Startup modelType of model: INSILICO MODEL
Final reconstructionAlgorithm: FOURIER SPACE / Resolution.type: BY AUTHOR / Resolution: 4.3 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 179199
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD
FSC plot (resolution estimation)

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Atomic model buiding 1

Initial model
PDB IDChain

8pz1

source_name: PDB, initial_model_type: experimental model

7ttc

source_name: PDB, initial_model_type: experimental model

3slt

source_name: PDB, initial_model_type: experimental model
RefinementSpace: REAL / Protocol: FLEXIBLE FIT / Overall B value: 190 / Target criteria: Cross-correlation coefficient
Output model

PDB-8q0g:
Release Complex: BAM bound EspP and Compact SurA

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