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- EMDB-26106: BamABCDE bound to substrate EspP class 2 -

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Basic information

Entry
Database: EMDB / ID: EMD-26106
TitleBamABCDE bound to substrate EspP class 2
Map dataBAM-MBP-76EspP class 2
Sample
  • Complex: BamABCDE bound to substrate EspP class 2
    • Protein or peptide: Outer membrane protein assembly factor BamA
    • Protein or peptide: Outer membrane protein assembly factor BamE
    • Protein or peptide: Outer membrane protein assembly factor BamD
    • Protein or peptide: Outer membrane protein assembly factor BamC
    • Protein or peptide: Maltose/maltodextrin-binding periplasmic protein,Serine protease EspP chimera
Keywordsmembrane protein folding / membrane dynamics / outer membrane protein / BAM / beta-barrel / MEMBRANE PROTEIN
Function / homology
Function and homology information


Bam protein complex / Gram-negative-bacterium-type cell outer membrane assembly / detection of maltose stimulus / maltose transport complex / protein insertion into membrane / carbohydrate transport / Hydrolases; Acting on peptide bonds (peptidases); Serine endopeptidases / carbohydrate transmembrane transporter activity / maltose binding / maltose transport ...Bam protein complex / Gram-negative-bacterium-type cell outer membrane assembly / detection of maltose stimulus / maltose transport complex / protein insertion into membrane / carbohydrate transport / Hydrolases; Acting on peptide bonds (peptidases); Serine endopeptidases / carbohydrate transmembrane transporter activity / maltose binding / maltose transport / maltodextrin transmembrane transport / ATP-binding cassette (ABC) transporter complex, substrate-binding subunit-containing / ATP-binding cassette (ABC) transporter complex / cell chemotaxis / cell outer membrane / outer membrane-bounded periplasmic space / periplasmic space / serine-type endopeptidase activity / DNA damage response / cell surface / proteolysis / extracellular region / membrane
Similarity search - Function
Peptidase S6, IgA endopeptidase / Peptidase family S6 domain / Immunoglobulin A1 protease / Peptidase family S6 domain profile. / Autotransporter beta-domain / Outer membrane autotransporter barrel / Autotransporter beta-domain / Autotransporter beta-domain profile. / Autotransporter beta-domain / Autotransporter beta-domain superfamily ...Peptidase S6, IgA endopeptidase / Peptidase family S6 domain / Immunoglobulin A1 protease / Peptidase family S6 domain profile. / Autotransporter beta-domain / 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 / 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 / Outer membrane protein assembly factor BamE domain / Outer membrane lipoprotein / BamE-like / Outer membrane protein assembly factor BamA / POTRA domain, BamA/TamA-like / Surface antigen variable number repeat / Surface antigen D15-like / POTRA domain / POTRA domain profile. / Bacterial surface antigen (D15) / Omp85 superfamily domain / Pectin lyase fold/virulence factor / Maltose/Cyclodextrin ABC transporter, substrate-binding protein / Solute-binding family 1, conserved site / Bacterial extracellular solute-binding proteins, family 1 signature. / Bacterial extracellular solute-binding protein / Bacterial extracellular solute-binding protein / Prokaryotic membrane lipoprotein lipid attachment site profile. / Tetratricopeptide-like helical domain superfamily
Similarity search - Domain/homology
Outer membrane protein assembly factor BamD / Outer membrane protein assembly factor BamE / Outer membrane protein assembly factor BamA / Maltose/maltodextrin-binding periplasmic protein / Serine protease EspP / Outer membrane protein assembly factor BamC
Similarity search - Component
Biological speciesEscherichia coli (E. coli)
Methodsingle particle reconstruction / cryo EM / Resolution: 4.3 Å
AuthorsDoyle MT / Jimah JR
Funding support United States, 2 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of Diabetes and Digestive and Kidney Disease (NIH/NIDDK)1ZIADK052037 United States
National Institutes of Health/National Institute of Diabetes and Digestive and Kidney Disease (NIH/NIDDK)1ZIADK060100 United States
CitationJournal: Cell / Year: 2022
Title: Cryo-EM structures reveal multiple stages of bacterial outer membrane protein folding.
Authors: Matthew Thomas Doyle / John R Jimah / Tyrone Dowdy / Shannon I Ohlemacher / Mioara Larion / Jenny E Hinshaw / Harris D Bernstein /
Abstract: Transmembrane β barrel proteins are folded into the outer membrane (OM) of Gram-negative bacteria by the β barrel assembly machinery (BAM) via a poorly understood process that occurs without known ...Transmembrane β barrel proteins are folded into the outer membrane (OM) of Gram-negative bacteria by the β barrel assembly machinery (BAM) via a poorly understood process that occurs without known external energy sources. Here, we used single-particle cryo-EM to visualize the folding dynamics of a model β barrel protein (EspP) by BAM. We found that BAM binds the highly conserved "β signal" motif of EspP to correctly orient β strands in the OM during folding. We also found that the folding of EspP proceeds via "hybrid-barrel" intermediates in which membrane integrated β sheets are attached to the essential BAM subunit, BamA. The structures show an unprecedented deflection of the membrane surrounding the EspP intermediates and suggest that β sheets progressively fold toward BamA to form a β barrel. Along with in vivo experiments that tracked β barrel folding while the OM tension was modified, our results support a model in which BAM harnesses OM elasticity to accelerate β barrel folding.
History
DepositionJan 31, 2022-
Header (metadata) releaseMar 30, 2022-
Map releaseMar 30, 2022-
UpdateNov 20, 2024-
Current statusNov 20, 2024Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_26106.png

Downloads & links

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Map

FileDownload / File: emd_26106.map.gz / Format: CCP4 / Size: 52.7 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationBAM-MBP-76EspP class 2
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.07 Å/pix.
x 240 pix.
= 257.717 Å		1.07 Å/pix.
x 240 pix.
= 257.717 Å		1.07 Å/pix.
x 240 pix.
= 257.717 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.07382 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.112
Minimum - Maximum-2.2081895 - 2.676599
Average (Standard dev.)0.005945629 (±0.055690918)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions240240240
Spacing240240240
CellA=B=C: 257.7168 Å
α=β=γ: 90.0 °

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Supplemental data

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Sample components

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Entire : BamABCDE bound to substrate EspP class 2

EntireName: BamABCDE bound to substrate EspP class 2
Components
  • Complex: BamABCDE bound to substrate EspP class 2
    • Protein or peptide: Outer membrane protein assembly factor BamA
    • Protein or peptide: Outer membrane protein assembly factor BamE
    • Protein or peptide: Outer membrane protein assembly factor BamD
    • Protein or peptide: Outer membrane protein assembly factor BamC
    • Protein or peptide: Maltose/maltodextrin-binding periplasmic protein,Serine protease EspP chimera

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Supramolecule #1: BamABCDE bound to substrate EspP class 2

SupramoleculeName: BamABCDE bound to substrate EspP class 2 / type: complex / ID: 1 / Parent: 0 / Macromolecule list: all
Source (natural)Organism: Escherichia coli (E. coli)

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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: 89.750094 KDa
Recombinant expressionOrganism: Escherichia coli BL21(DE3) (bacteria)
SequenceString: AHHHHHHHHG GEGFVVKDIH FEGLQRVAVG AALLSMPVRT GDTVNDEDIS NTIRALFATG NFEDVRVLRD GDTLLVQVKE RPTIASITF SGNKSVKDDM LKQNLEASGV RVGESLDRTT IADIEKGLED FYYSVGKYSA SVKAVVTPLP RNRVDLKLVF Q EGVSAEIQ ...String:
AHHHHHHHHG GEGFVVKDIH FEGLQRVAVG AALLSMPVRT GDTVNDEDIS NTIRALFATG NFEDVRVLRD GDTLLVQVKE RPTIASITF SGNKSVKDDM LKQNLEASGV RVGESLDRTT IADIEKGLED FYYSVGKYSA SVKAVVTPLP RNRVDLKLVF Q EGVSAEIQ QINIVGNHAF TTDELISHFQ LRDEVPWWNV VGDRKYQKQK LAGDLETLRS YYLDRGYARF NIDSTQVSLT PD KKGIYVT VNITEGDQYK LSGVEVSGNL AGHSAEIEQL TKIEPGELYN GTKVTKMEDD IKKLLGRYGY AYPRVQSMPE IND ADKTVK LRVNVDAGNR FYVRKIRFEG NDTSKDAVLR REMRQMEGAW LGSDLVDQGK ERLNRLGFFE TVDTDTQRVP GSPD QVDVV YKVKERNTGC FNFGIGYGTE SGVSFQAGVQ QDNWLGTGYA VGINGTKNDY QTYAELSVTN PYFTVDGVSL GGRLF YNDF QADDADLSDY TNKSYGTDVT LGFPINEYNS LRAGLGYVHN SLSNMQPQVA MWRYLYSMGE HPSTSDQDNS FKTDDF TFN YGWTYNKLDR GYFPTDGSRV NLTGKVTIPG SDNEYYKVTL DTATYVPIDD DHKWVVLGRT RWGYGDGLGG KEMPFYE NF YAGGSSTVRG FQSNTIGPKA VYFPHQASNY DPDYDYECAT QDGAKDLCKS DDAVGGNAMA VASLEFITPT PFISDKYA N SVRTSFFWDM 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 BamE

MacromoleculeName: Outer membrane protein assembly factor BamE / type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Escherichia coli (E. coli)
Molecular weightTheoretical: 10.391554 KDa
Recombinant expressionOrganism: Escherichia coli BL21(DE3) (bacteria)
SequenceString:
CSTLERVVYR PDINQGNYLT ANDVSKIRVG MTQQQVAYAL GTPLMSDPFG TNTWFYVFRQ QPGHEGVTQQ TLTLTFNSSG VLTNIDNKP ALSGN

UniProtKB: Outer membrane protein assembly factor BamE

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Macromolecule #3: Outer membrane protein assembly factor BamD

MacromoleculeName: Outer membrane protein assembly factor BamD / type: protein_or_peptide / ID: 3 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Escherichia coli (E. coli)
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 #4: Outer membrane protein assembly factor BamC

MacromoleculeName: Outer membrane protein assembly factor BamC / type: protein_or_peptide / ID: 4 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Escherichia coli (E. coli)
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 #5: Maltose/maltodextrin-binding periplasmic protein,Serine protease ...

MacromoleculeName: Maltose/maltodextrin-binding periplasmic protein,Serine protease EspP chimera
type: protein_or_peptide / ID: 5 / 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: 83.429984 KDa
Recombinant expressionOrganism: Escherichia coli BL21(DE3) (bacteria)
SequenceString: AWSHPQFEKG GGSGGGSGGS AWSHPQFEKG GAKIEEGKLV IWINGDKGYN GLAEVGKKFE KDTGIKVTVE HPDKLEEKFP QVAATGDGP DIIFWAHDRF GGYAQSGLLA EITPDKAFQD KLYPFTWDAV RYNGKLIAYP IAVEALSLIY NKDLLPNPPK T WEEIPALD ...String:
AWSHPQFEKG GGSGGGSGGS AWSHPQFEKG GAKIEEGKLV IWINGDKGYN GLAEVGKKFE KDTGIKVTVE HPDKLEEKFP QVAATGDGP DIIFWAHDRF GGYAQSGLLA EITPDKAFQD KLYPFTWDAV RYNGKLIAYP IAVEALSLIY NKDLLPNPPK T WEEIPALD KELKAKGKSA LMFNLQEPYF TWPLIAADGG YAFKYENGKY DIKDVGVDNA GAKAGLTFLV DLIKNKHMNA DT DYSIAEA AFNKGETAMT INGPWAWSNI DTSKVNYGVT VLPTFKGQPS KPFVGVLSAG INAASPNKEL AKEFLENYLL TDE GLEAVN KDKPLGAVAL KSYEEELAKD PRIAATMENA QKGEIMPNIP QMSAFWYAVR TAVINAASGR QTVDEALKDA QTNS GSNIE LVSAPKDTNE NVFKASKQTI GFSDVTPVIT TRETGENLYF QGGDDKITWS LTGYNTVANK EATRNAAALF SVDYK AFLN EVNNLNKRMG DLRDINGEAG AWARIMSGTG SASGGFSDNY THVQVGVDKK HELDGLDLFT GFTVTHTDSS ASADVF SGK TKSVGAGLYA SAMFDSGAYI DLIGKYVHHD NEYTATFAGL GTRDYSTHSW YAGAEAGYRY HVTEDAWIEP QAELVYG SV SGKQFAWKDQ GMHLSMKDKD YNPLIGRTGV DVGKSFSGKD WKVTARAGLG YQFDLLANGE TVLRDASGEK RIKGEKDS R MLMSVGLNAE IRDNVRFGLE FEKSAFGKYN VDNAVNANFR YCF

UniProtKB: Maltose/maltodextrin-binding periplasmic protein, 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

Concentration2 mg/mL
BufferpH: 8
VitrificationCryogen name: ETHANE / Instrument: LEICA EM GP

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recording#0 - Image recording ID: 1 / #0 - Film or detector model: GATAN K2 SUMMIT (4k x 4k) / #0 - Average electron dose: 60.0 e/Å2 / #1 - Image recording ID: 2 / #1 - Film or detector model: GATAN K3 (6k x 4k) / #1 - Average electron dose: 60.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 1.8 µm / Nominal defocus min: 0.6 µm
Sample stageCooling holder cryogen: NITROGEN
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Image recording ID1
Startup modelType of model: OTHER
Final reconstructionResolution.type: BY AUTHOR / Resolution: 4.3 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 171948
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD
FSC plot (resolution estimation)

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