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- EMDB-14242: E. coli BAM complex (BamABCDE) bound to dynobactin A -

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Basic information

Entry
Database: EMDB / ID: EMD-14242
TitleE. coli BAM complex (BamABCDE) bound to dynobactin A
Map data
Sample
  • Complex: BAM complex
    • Complex: BAM
      • 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
    • Complex: Dynobactin A
      • Protein or peptide: Dynobactin A
KeywordsBeta-Barrel / outer membrane / protein insertion / protein folding / protein maturation / antibiotic / natural product / cyclized peptide / 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 / 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 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 / Outer membrane protein assembly factor BamA / POTRA domain, BamA/TamA-like / Surface antigen variable number repeat / 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 / Tetratricopeptide-like helical domain superfamily / Prokaryotic membrane lipoprotein lipid attachment site profile. / WD40/YVTN repeat-like-containing domain superfamily
Similarity search - Domain/homology
Uncharacterized protein / 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) / Photorhabdus australis (bacteria)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.6 Å
AuthorsJakob RP / Hiller S
Funding support Switzerland, 1 items
OrganizationGrant numberCountry
Swiss National Science Foundation177084 Switzerland
CitationJournal: Nat Microbiol / Year: 2022
Title: Computational identification of a systemic antibiotic for gram-negative bacteria.
Authors: Ryan D Miller / Akira Iinishi / Seyed Majed Modaresi / Byung-Kuk Yoo / Thomas D Curtis / Patrick J Lariviere / Libang Liang / Sangkeun Son / Samantha Nicolau / Rachel Bargabos / Madeleine ...Authors: Ryan D Miller / Akira Iinishi / Seyed Majed Modaresi / Byung-Kuk Yoo / Thomas D Curtis / Patrick J Lariviere / Libang Liang / Sangkeun Son / Samantha Nicolau / Rachel Bargabos / Madeleine Morrissette / Michael F Gates / Norman Pitt / Roman P Jakob / Parthasarathi Rath / Timm Maier / Andrey G Malyutin / Jens T Kaiser / Samantha Niles / Blake Karavas / Meghan Ghiglieri / Sarah E J Bowman / Douglas C Rees / Sebastian Hiller / Kim Lewis /
Abstract: Discovery of antibiotics acting against Gram-negative species is uniquely challenging due to their restrictive penetration barrier. BamA, which inserts proteins into the outer membrane, is an ...Discovery of antibiotics acting against Gram-negative species is uniquely challenging due to their restrictive penetration barrier. BamA, which inserts proteins into the outer membrane, is an attractive target due to its surface location. Darobactins produced by Photorhabdus, a nematode gut microbiome symbiont, target BamA. We reasoned that a computational search for genes only distantly related to the darobactin operon may lead to novel compounds. Following this clue, we identified dynobactin A, a novel peptide antibiotic from Photorhabdus australis containing two unlinked rings. Dynobactin is structurally unrelated to darobactins, but also targets BamA. Based on a BamA-dynobactin co-crystal structure and a BAM-complex-dynobactin cryo-EM structure, we show that dynobactin binds to the BamA lateral gate, uniquely protruding into its β-barrel lumen. Dynobactin showed efficacy in a mouse systemic Escherichia coli infection. This study demonstrates the utility of computational approaches to antibiotic discovery and suggests that dynobactin is a promising lead for drug development.
History
DepositionFeb 3, 2022-
Header (metadata) releaseSep 28, 2022-
Map releaseSep 28, 2022-
UpdateApr 3, 2024-
Current statusApr 3, 2024Processing site: PDBe / Status: Released

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Structure visualization

Supplemental images

emd_14242.png

Downloads & links

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Map

FileDownload / File: emd_14242.map.gz / Format: CCP4 / Size: 178 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.82 Å/pix.
x 360 pix.
= 295.2 Å		0.82 Å/pix.
x 360 pix.
= 295.2 Å		0.82 Å/pix.
x 360 pix.
= 295.2 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 0.82 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.078
Minimum - Maximum-0.18294592 - 0.4014262
Average (Standard dev.)0.0005449941 (±0.010092262)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions360360360
Spacing360360360
CellA=B=C: 295.2 Å
α=β=γ: 90.0 °

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Supplemental data

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Mask #1

Fileemd_14242_msk_1.map
Projections & Slices
AxesZYX

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Histogram

Histogram (log scale)

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Additional map: sharpened map

Fileemd_14242_additional_1.map
Annotationsharpened map
Projections & Slices
AxesZYX

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Density Histograms

Histogram

Histogram (log scale)

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Half map: #2

Fileemd_14242_half_map_1.map
Projections & Slices
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Slices (1/2)
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Histogram

Histogram (log scale)

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Half map: #1

Fileemd_14242_half_map_2.map
Projections & Slices
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Histogram (log scale)

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Sample components

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Entire : BAM complex

EntireName: BAM complex
Components
  • Complex: BAM complex
    • Complex: BAM
      • 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
    • Complex: Dynobactin A
      • Protein or peptide: Dynobactin A

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Supramolecule #1: BAM complex

SupramoleculeName: BAM complex / type: complex / ID: 1 / Parent: 0 / Macromolecule list: all

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Supramolecule #2: BAM

SupramoleculeName: BAM / type: complex / ID: 2 / Parent: 1 / Macromolecule list: #1-#5
Source (natural)Organism: Escherichia coli K-12 (bacteria)

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Supramolecule #3: Dynobactin A

SupramoleculeName: Dynobactin A / type: complex / ID: 3 / Parent: 1 / Macromolecule list: #6
Source (natural)Organism: Photorhabdus australis (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) / Strain: K12
Molecular weightTheoretical: 90.457172 KDa
Recombinant expressionOrganism: Escherichia coli BL21(DE3) (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 QFQFNIGKT

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) / Strain: K12
Molecular weightTheoretical: 42.961086 KDa
Recombinant expressionOrganism: Escherichia coli BL21(DE3) (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 K-12 (bacteria) / Strain: K12
Molecular weightTheoretical: 36.875277 KDa
Recombinant expressionOrganism: Escherichia coli BL21(DE3) (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 K-12 (bacteria) / Strain: K12
Molecular weightTheoretical: 27.85835 KDa
Recombinant expressionOrganism: Escherichia coli BL21(DE3) (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 K-12 (bacteria) / Strain: K12
Molecular weightTheoretical: 13.382195 KDa
Recombinant expressionOrganism: Escherichia coli BL21(DE3) (bacteria)
SequenceString:
MRCKTLTAAA AVLLMLTAGC STLERVVYRP DINQGNYLTA NDVSKIRVGM TQQQVAYALG TPLMSDPFGT NTWFYVFRQQ PGHEGVTQQ TLTLTFNSSG VLTNIDNKPA LSGNKLHHHH HH

UniProtKB: Outer membrane protein assembly factor BamE

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Macromolecule #6: Dynobactin A

MacromoleculeName: Dynobactin A / type: protein_or_peptide / ID: 6 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Photorhabdus australis (bacteria)
Molecular weightTheoretical: 1.311405 KDa
SequenceString:
WNSNVHSYRF

UniProtKB: Uncharacterized protein

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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

Concentration7 mg/mL
BufferpH: 8
Details: 20 mM Tris pH 8.0, 150 mM NaCl, 0.05% (w/v) n-dodecyl Beta-D-maltopyranoside (DDM)
GridModel: Quantifoil R2/1 / Material: GOLD / Mesh: 200 / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 30 sec.
VitrificationCryogen name: ETHANE / Chamber humidity: 95 % / Chamber temperature: 290 K / Instrument: FEI VITROBOT MARK IV

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K2 SUMMIT (4k x 4k) / Detector mode: COUNTING / Number grids imaged: 1 / Number real images: 4499 / Average exposure time: 9.0 sec. / Average electron dose: 48.0 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: 2.5 µm / Nominal defocus min: 0.8 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: 154281
Startup modelType of model: PDB ENTRY
PDB model - PDB ID:

7nri

Final reconstructionNumber classes used: 1 / Applied symmetry - Point group: C1 (asymmetric) / Resolution.type: BY AUTHOR / Resolution: 3.6 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 68478
Initial angle assignmentType: PROJECTION MATCHING
Final angle assignmentType: OTHER / Software - Name: cryoSPARC
Final 3D classificationNumber classes: 2 / Software - Name: cryoSPARC

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