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- EMDB-10125: Cryo-EM structure of LptB2FGC in complex with lipopolysaccharide -

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Basic information

Entry
Database: EMDB / ID: EMD-10125
TitleCryo-EM structure of LptB2FGC in complex with lipopolysaccharide
Map dataNone
Sample
  • Complex: LptB2FGC
    • Protein or peptide: Lipopolysaccharide ABC transporter, ATP-binding protein LptB
    • Protein or peptide: Lipopolysaccharide export system protein LptC
    • Protein or peptide: Lipopolysaccharide export system permease protein LptF
    • Protein or peptide: Inner membrane protein yjgQ
  • Ligand: 2-decyl-5,6-dimethoxy-3-methylcyclohexa-2,5-diene-1,4-dione
  • Ligand: Lauryl Maltose Neopentyl Glycol
  • Ligand: DODECYL-BETA-D-MALTOSIDE
  • Ligand: lipopolysaccharide fragment
Keywordslipopolysaccharide transporter / LPS / LptB2FGC / LptB / LptBFG / outer membrane / Gram-negative bacteria / ABC transporter / Inner membrane protein complex / TRANSPORT PROTEIN
Function / homology
Function and homology information


lipopolysaccharide transmembrane transporter activity / Translocases; Catalysing the translocation of carbohydrates and their derivatives; Linked to the hydrolysis of a nucleoside triphosphate / lipopolysaccharide transport / Gram-negative-bacterium-type cell outer membrane assembly / ATP-binding cassette (ABC) transporter complex / transmembrane transport / ATP hydrolysis activity / ATP binding / plasma membrane / cytoplasm
Similarity search - Function
Lipopolysaccharide assembly, LptC-related / Lipopolysaccharide export system protein LptC / : / Lipopolysaccharide-assembly, LptC-related / Permease LptG/LptF-related / LPS export ABC transporter permease LptF / LPS export ABC transporter permease LptG / Lipopolysaccharide export system permease LptF/LptG / Branched-chain amino acid ATP-binding cassette transporter, C-terminal / Branched-chain amino acid ATP-binding cassette transporter ...Lipopolysaccharide assembly, LptC-related / Lipopolysaccharide export system protein LptC / : / Lipopolysaccharide-assembly, LptC-related / Permease LptG/LptF-related / LPS export ABC transporter permease LptF / LPS export ABC transporter permease LptG / Lipopolysaccharide export system permease LptF/LptG / Branched-chain amino acid ATP-binding cassette transporter, C-terminal / Branched-chain amino acid ATP-binding cassette transporter / LPS export ABC transporter, ATP-binding protein LptB / : / ABC transporter-like, conserved site / ABC transporters family signature. / ABC transporter / ABC transporter-like, ATP-binding domain / ATP-binding cassette, ABC transporter-type domain profile. / ATPases associated with a variety of cellular activities / AAA+ ATPase domain / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
LPS export ABC transporter permease LptG / Inner membrane protein yjgQ / Lipopolysaccharide export system protein LptC / Lipopolysaccharide export system ATP-binding protein LptB / Lipopolysaccharide export system ATP-binding protein LptB / Lipopolysaccharide export system protein LptC / Lipopolysaccharide export system permease protein LptF
Similarity search - Component
Biological speciesShigella flexneri (bacteria)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.1 Å
AuthorsTang XD / Chang SH
CitationJournal: Nat Commun / Year: 2019
Title: Cryo-EM structures of lipopolysaccharide transporter LptBFGC in lipopolysaccharide or AMP-PNP-bound states reveal its transport mechanism.
Authors: Xiaodi Tang / Shenghai Chang / Qinghua Luo / Zhengyu Zhang / Wen Qiao / Caihuang Xu / Changbin Zhang / Yang Niu / Wenxian Yang / Ting Wang / Zhibo Zhang / Xiaofeng Zhu / Xiawei Wei / ...Authors: Xiaodi Tang / Shenghai Chang / Qinghua Luo / Zhengyu Zhang / Wen Qiao / Caihuang Xu / Changbin Zhang / Yang Niu / Wenxian Yang / Ting Wang / Zhibo Zhang / Xiaofeng Zhu / Xiawei Wei / Changjiang Dong / Xing Zhang / Haohao Dong /
Abstract: Lipopolysaccharides (LPS) of Gram-negative bacteria are critical for the defence against cytotoxic substances and must be transported from the inner membrane (IM) to the outer membrane (OM) through ...Lipopolysaccharides (LPS) of Gram-negative bacteria are critical for the defence against cytotoxic substances and must be transported from the inner membrane (IM) to the outer membrane (OM) through a bridge formed by seven membrane proteins (LptBFGCADE). The IM component LptBFG powers the process through a yet unclarified mechanism. Here we report three high-resolution cryo-EM structures of LptBFG alone and complexed with LptC (LptBFGC), trapped in either the LPS- or AMP-PNP-bound state. The structures reveal conformational changes between these states and substrate binding with or without LptC. We identify two functional transmembrane arginine-containing loops interacting with the bound AMP-PNP and elucidate allosteric communications between the domains. AMP-PNP binding induces an inward rotation and shift of the transmembrane helices of LptFG and LptC to tighten the cavity, with the closure of two lateral gates, to eventually expel LPS into the bridge. Functional assays reveal the functionality of the LptF and LptG periplasmic domains. Our findings shed light on the LPS transport mechanism.
History
DepositionJul 10, 2019-
Header (metadata) releaseSep 25, 2019-
Map releaseSep 25, 2019-
UpdateJul 2, 2025-
Current statusJul 2, 2025Processing site: PDBe / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.03
  • Imaged by UCSF Chimera
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  • Surface view colored by height
  • Surface level: 0.03
  • Imaged by UCSF Chimera
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  • Surface view with fitted model
  • Atomic models: PDB-6s8n
  • Surface level: 0.03
  • Imaged by UCSF Chimera
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_10125.png

Downloads & links

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Map

FileDownload / File: emd_10125.map.gz / Format: CCP4 / Size: 52.7 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationNone
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.01 Å/pix.
x 240 pix.
= 243.36 Å		1.01 Å/pix.
x 240 pix.
= 243.36 Å		1.01 Å/pix.
x 240 pix.
= 243.36 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.014 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.03 / Movie #1: 0.03
Minimum - Maximum-0.11385861 - 0.1985105
Average (Standard dev.)-0.00015663778 (±0.005327225)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions240240240
Spacing240240240
CellA=B=C: 243.36002 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.0141.0141.014
M x/y/z240240240
origin x/y/z0.0000.0000.000
length x/y/z243.360243.360243.360
α/β/γ90.00090.00090.000
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS240240240
D min/max/mean-0.1140.199-0.000

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Supplemental data

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Sample components

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Entire : LptB2FGC

EntireName: LptB2FGC
Components
  • Complex: LptB2FGC
    • Protein or peptide: Lipopolysaccharide ABC transporter, ATP-binding protein LptB
    • Protein or peptide: Lipopolysaccharide export system protein LptC
    • Protein or peptide: Lipopolysaccharide export system permease protein LptF
    • Protein or peptide: Inner membrane protein yjgQ
  • Ligand: 2-decyl-5,6-dimethoxy-3-methylcyclohexa-2,5-diene-1,4-dione
  • Ligand: Lauryl Maltose Neopentyl Glycol
  • Ligand: DODECYL-BETA-D-MALTOSIDE
  • Ligand: lipopolysaccharide fragment

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Supramolecule #1: LptB2FGC

SupramoleculeName: LptB2FGC / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#4 / Details: LPS transporter LptB2FGC
Source (natural)Organism: Shigella flexneri (bacteria)

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Macromolecule #1: Lipopolysaccharide ABC transporter, ATP-binding protein LptB

MacromoleculeName: Lipopolysaccharide ABC transporter, ATP-binding protein LptB
type: protein_or_peptide / ID: 1 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Shigella flexneri (bacteria)
Molecular weightTheoretical: 26.837668 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: MATLTAKNLA KAYKGRRVVE DVSLTVNSGE IVGLLGPNGA GKTTTFYMVV GIVPRDAGNI IIDDDDISLL PLHARARRGI GYLPQEASI FRRLSVYDNL MAVLQIRDDL SAEQREDRAN ELMEEFHIEH LRDSMGQSLS GGERRRVEIA RALAANPKFI L LDEPFAGV ...String:
MATLTAKNLA KAYKGRRVVE DVSLTVNSGE IVGLLGPNGA GKTTTFYMVV GIVPRDAGNI IIDDDDISLL PLHARARRGI GYLPQEASI FRRLSVYDNL MAVLQIRDDL SAEQREDRAN ELMEEFHIEH LRDSMGQSLS GGERRRVEIA RALAANPKFI L LDEPFAGV DPISVIDIKR IIEHLRDSGL GVLITDHNVR ETLAVCERAY IVSQGHLIAH GTPTEILQDE HVKRVYLGED FR L

UniProtKB: Lipopolysaccharide export system ATP-binding protein LptB

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Macromolecule #2: Lipopolysaccharide export system protein LptC

MacromoleculeName: Lipopolysaccharide export system protein LptC / type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Shigella flexneri (bacteria)
Molecular weightTheoretical: 21.726576 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString:
MSKARRWVII VLSLAVLVMI GINMAEKDDT AQVVVNNNDP TYKSEHTDTL VYNPEGALSY RLIAQHVEYY SDQAVSWFTQ PVLTTFDKD KIPTWSVKAD KAKLTNDRML YLYGHVEVNA LVPDSQLRRI TTDNAQINLV TQDVTSEDLV TLYGTTFNSS G LKMRGNLR SKNAELIEKV RTSYEIQNKQ TQP

UniProtKB: Lipopolysaccharide export system protein LptC

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Macromolecule #3: Lipopolysaccharide export system permease protein LptF

MacromoleculeName: Lipopolysaccharide export system permease protein LptF
type: protein_or_peptide / ID: 3 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Shigella flexneri (bacteria)
Molecular weightTheoretical: 40.34543 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: MIIIRYLVRE TLKSQLAILF ILLLIFFCQK LVRILGAAVD GDIPANLVLS LLGLGVPEMA QLILPLSLFL GLLMTLGKLY TESEITVMH ACGLSKAVLV KAAMILAVFT AIVAAVNVMW AGPWSSRHQD EVLAEAKANP GMAALAQGQF QQATNGSSVL F IESVDGSD ...String:
MIIIRYLVRE TLKSQLAILF ILLLIFFCQK LVRILGAAVD GDIPANLVLS LLGLGVPEMA QLILPLSLFL GLLMTLGKLY TESEITVMH ACGLSKAVLV KAAMILAVFT AIVAAVNVMW AGPWSSRHQD EVLAEAKANP GMAALAQGQF QQATNGSSVL F IESVDGSD FKDVFLAQIR PKGNARPSVV VADSGHLTQL RDGSQVVTLN QGTRFEGTAL LRDFRITDFQ DYQAIIGHQA VA LDPNDTD QMDMRTLWNT DTDRARAELN WRITLVVTVF MMALMVVPLS VVNPRQGRVL SMLPAMLLYL LFFLIQTSLK SNG GKGKLD PTLWMWTVNL IYLALAIVLN LWDTVPVRRL RASFSRKGAV

UniProtKB: Lipopolysaccharide export system permease protein LptF

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Macromolecule #4: Inner membrane protein yjgQ

MacromoleculeName: Inner membrane protein yjgQ / type: protein_or_peptide / ID: 4 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Shigella flexneri (bacteria)
Molecular weightTheoretical: 39.622414 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: MQPFGVLDRY IGKTIFTTIM MTLFMLVSLS GIIKFVDQLK KAGQGSYDAL GAGMYTLLSV PKDVQIFFPM AALLGALLGL GMLAQRSEL VVMQASGFTR MQVALSVMKT AIPLVLLTMA IGEWVAPQGE QMARNYRAQA MYGGSLLSTQ QGLWAKDGNN F VYIERVKG ...String:
MQPFGVLDRY IGKTIFTTIM MTLFMLVSLS GIIKFVDQLK KAGQGSYDAL GAGMYTLLSV PKDVQIFFPM AALLGALLGL GMLAQRSEL VVMQASGFTR MQVALSVMKT AIPLVLLTMA IGEWVAPQGE QMARNYRAQA MYGGSLLSTQ QGLWAKDGNN F VYIERVKG DEVLGGISIY AFNENRRLQS VRYAATAKFD PEHKVWRLSQ VDESDLTNPK QITGSQTVSG TWKTDLTPDK LG VVALDPD ALSISGLHNY VKYLKSSGQD AGRYQLNMWS KIFQPLSVAV MMLMALSFIF GPLRSVPMGV RVVTGISFGF VFY VLDQIF GPLTLVYGIP PIIGALLPSA SFFLISLWLL MRKS

UniProtKB: Inner membrane protein yjgQ

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Macromolecule #5: 2-decyl-5,6-dimethoxy-3-methylcyclohexa-2,5-diene-1,4-dione

MacromoleculeName: 2-decyl-5,6-dimethoxy-3-methylcyclohexa-2,5-diene-1,4-dione
type: ligand / ID: 5 / Number of copies: 2 / Formula: DCQ
Molecular weightTheoretical: 322.439 Da
Chemical component information

ChemComp-DCQ:
2-decyl-5,6-dimethoxy-3-methylcyclohexa-2,5-diene-1,4-dione

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Macromolecule #6: Lauryl Maltose Neopentyl Glycol

MacromoleculeName: Lauryl Maltose Neopentyl Glycol / type: ligand / ID: 6 / Number of copies: 2 / Formula: LMN
Molecular weightTheoretical: 1.005188 KDa
Chemical component information

ChemComp-AV0:
Lauryl Maltose Neopentyl Glycol

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Macromolecule #7: DODECYL-BETA-D-MALTOSIDE

MacromoleculeName: DODECYL-BETA-D-MALTOSIDE / type: ligand / ID: 7 / Number of copies: 2 / Formula: LMT
Molecular weightTheoretical: 510.615 Da
Chemical component information

ChemComp-LMT:
DODECYL-BETA-D-MALTOSIDE / detergent*YM

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Macromolecule #8: lipopolysaccharide fragment

MacromoleculeName: lipopolysaccharide fragment / type: ligand / ID: 8 / Number of copies: 1 / Formula: L0W
Molecular weightTheoretical: 1.814408 KDa
Chemical component information

ChemComp-L0W:
lipopolysaccharide fragment

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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

Concentration1 mg/mL
BufferpH: 7.8
Component:
ConcentrationFormula
20.0 mMHEPES
150.0 mMNaCl
0.05 %LMNG
GridModel: Quantifoil R1.2/1.3 / Material: COPPER / Mesh: 300 / Support film - Material: CARBON / Support film - topology: HOLEY / Support film - Film thickness: 150 / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 60 sec.
VitrificationCryogen name: ETHANE / Chamber humidity: 95 % / Chamber temperature: 298 K / Instrument: FEI VITROBOT MARK III

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K2 SUMMIT (4k x 4k) / Detector mode: COUNTING / Average electron dose: 40.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: DIFFRACTION
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

CTF correctionSoftware - Name: EMAN2 (ver. 4) / Type: PHASE FLIPPING ONLY
Startup modelType of model: PDB ENTRY
PDB model - PDB ID:

5l75

Final reconstructionApplied symmetry - Point group: C1 (asymmetric) / Resolution.type: BY AUTHOR / Resolution: 3.1 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 546301
Initial angle assignmentType: ANGULAR RECONSTITUTION
Final angle assignmentType: ANGULAR RECONSTITUTION

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