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- EMDB-9124: Vanadate trapped Cryo-EM Structure of E.coli LptB2FG Transporter -

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Basic information

Entry
Database: EMDB / ID: EMD-9124
TitleVanadate trapped Cryo-EM Structure of E.coli LptB2FG Transporter
Map dataCryo-EM map of LptB2FG trapped with vanadate filtered to 4.1A and -200 b-factor
Sample
  • Complex: LptB2FG
    • Protein or peptide: Lipopolysaccharide export system ATP-binding protein LptB
    • Protein or peptide: Lipopolysaccharide export system permease protein LptF
    • Protein or peptide: Lipopolysaccharide export system permease protein LptG
  • Ligand: ADP ORTHOVANADATE
KeywordsABC transporter / lipopolysaccharide / LPS / nanodisc / TRANSPORT PROTEIN-Hydrolase complex
Function / homology
Function and homology information


Translocases; Catalysing the translocation of carbohydrates and their derivatives; Linked to the hydrolysis of a nucleoside triphosphate / transporter complex / lipopolysaccharide transport / Gram-negative-bacterium-type cell outer membrane assembly / ATP-binding cassette (ABC) transporter complex / transmembrane transport / ATP hydrolysis activity / ATP binding / membrane / plasma membrane / cytoplasm
Similarity search - Function
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. ...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
Lipopolysaccharide export system ATP-binding protein LptB / Lipopolysaccharide export system permease protein LptG / Lipopolysaccharide export system permease protein LptF
Similarity search - Component
Biological speciesEscherichia coli (E. coli) / Escherichia coli (strain K12) (bacteria)
Methodsingle particle reconstruction / cryo EM / Resolution: 4.1 Å
AuthorsOrlando BJ / Li Y
Funding support United States, 1 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)R01GM122797 United States
CitationJournal: Nature / Year: 2019
Title: Structural basis of lipopolysaccharide extraction by the LptBFGC complex.
Authors: Yanyan Li / Benjamin J Orlando / Maofu Liao /
Abstract: In Gram-negative bacteria, lipopolysaccharide is essential for outer membrane formation and antibiotic resistance. The seven lipopolysaccharide transport (Lpt) proteins A-G move lipopolysaccharide ...In Gram-negative bacteria, lipopolysaccharide is essential for outer membrane formation and antibiotic resistance. The seven lipopolysaccharide transport (Lpt) proteins A-G move lipopolysaccharide from the inner to the outer membrane. The ATP-binding cassette transporter LptBFG, which tightly associates with LptC, extracts lipopolysaccharide out of the inner membrane. The mechanism of the LptBFG-LptC complex (LptBFGC) and the role of LptC in lipopolysaccharide transport are poorly understood. Here we characterize the structures of LptBFG and LptBFGC in nucleotide-free and vanadate-trapped states, using single-particle cryo-electron microscopy. These structures resolve the bound lipopolysaccharide, reveal transporter-lipopolysaccharide interactions with side-chain details and uncover how the capture and extrusion of lipopolysaccharide are coupled to conformational rearrangements of LptBFGC. LptC inserts its transmembrane helix between the two transmembrane domains of LptBFG, which represents a previously unknown regulatory mechanism for ATP-binding cassette transporters. Our results suggest a role for LptC in achieving efficient lipopolysaccharide transport, by coordinating the action of LptBFG in the inner membrane and Lpt protein interactions in the periplasm.
History
DepositionSep 18, 2018-
Header (metadata) releaseOct 17, 2018-
Map releaseApr 3, 2019-
UpdateMar 13, 2024-
Current statusMar 13, 2024Processing site: RCSB / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.05
  • Imaged by UCSF Chimera
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  • Surface view colored by height
  • Surface level: 0.05
  • Imaged by UCSF Chimera
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  • Surface view with fitted model
  • Atomic models: PDB-6mhz
  • Surface level: 0.05
  • Imaged by UCSF Chimera
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_9124.png

Downloads & links

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Map

FileDownload / File: emd_9124.map.gz / Format: CCP4 / Size: 27 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationCryo-EM map of LptB2FG trapped with vanadate filtered to 4.1A and -200 b-factor
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.23 Å/pix.
x 192 pix.
= 236.16 Å		1.23 Å/pix.
x 192 pix.
= 236.16 Å		1.23 Å/pix.
x 192 pix.
= 236.16 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.23 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.05 / Movie #1: 0.05
Minimum - Maximum-0.12860838 - 0.20421991
Average (Standard dev.)-0.00008363282 (±0.0119851045)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions192192192
Spacing192192192
CellA=B=C: 236.16 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.231.231.23
M x/y/z192192192
origin x/y/z0.0000.0000.000
length x/y/z236.160236.160236.160
α/β/γ90.00090.00090.000
start NX/NY/NZ-383-383-383
NX/NY/NZ768768768
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS192192192
D min/max/mean-0.1290.204-0.000

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Supplemental data

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Additional map: Unsharpened cryo-EM map of LptB2FG trapped with vanadate

Fileemd_9124_additional.map
AnnotationUnsharpened cryo-EM map of LptB2FG trapped with vanadate
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : LptB2FG

EntireName: LptB2FG
Components
  • Complex: LptB2FG
    • Protein or peptide: Lipopolysaccharide export system ATP-binding protein LptB
    • Protein or peptide: Lipopolysaccharide export system permease protein LptF
    • Protein or peptide: Lipopolysaccharide export system permease protein LptG
  • Ligand: ADP ORTHOVANADATE

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Supramolecule #1: LptB2FG

SupramoleculeName: LptB2FG / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#3
Source (natural)Organism: Escherichia coli (E. coli) / Strain: K-12

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Macromolecule #1: Lipopolysaccharide export system ATP-binding protein LptB

MacromoleculeName: Lipopolysaccharide export system ATP-binding protein LptB
type: protein_or_peptide / ID: 1 / Number of copies: 2 / Enantiomer: LEVO
EC number: Hydrolases; Acting on acid anhydrides; Acting on acid anhydrides to catalyse transmembrane movement of substances
Source (natural)Organism: Escherichia coli (strain K12) (bacteria) / Strain: K12
Molecular weightTheoretical: 28.131088 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: MGHHHHHHHH MATLTAKNLA KAYKGRRVVE DVSLTVNSGE IVGLLGPNGA GKTTTFYMVV GIVPRDAGNI IIDDDDISLL PLHARARRG IGYLPQEASI FRRLSVYDNL MAVLQIRDDL SAEQREDRAN ELMEEFHIEH LRDSMGQSLS GGERRRVEIA R ALAANPKF ...String:
MGHHHHHHHH MATLTAKNLA KAYKGRRVVE DVSLTVNSGE IVGLLGPNGA GKTTTFYMVV GIVPRDAGNI IIDDDDISLL PLHARARRG IGYLPQEASI FRRLSVYDNL MAVLQIRDDL SAEQREDRAN ELMEEFHIEH LRDSMGQSLS GGERRRVEIA R ALAANPKF ILLDEPFAGV DPISVIDIKR IIEHLRDSGL GVLITDHNVR ETLAVCERAY IVSQGHLIAH GTPTEILQDE HV KRVYLGE DFRL

UniProtKB: Lipopolysaccharide export system ATP-binding protein LptB

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Macromolecule #2: Lipopolysaccharide export system permease protein LptF

MacromoleculeName: Lipopolysaccharide export system permease protein LptF
type: protein_or_peptide / ID: 2 / Details: 56 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Escherichia coli (strain K12) (bacteria) / Strain: K12
Molecular weightTheoretical: 40.393473 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 WRITLVFTVF MMALMVVPLS VVNPRQGRVL SMLPAMLLYL LFFLIQTSLK SNG GKGKLD PTLWMWTVNL IYLALAIVLN LWDTVPVRRL RASFSRKGAV

UniProtKB: Lipopolysaccharide export system permease protein LptF

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Macromolecule #3: Lipopolysaccharide export system permease protein LptG

MacromoleculeName: Lipopolysaccharide export system permease protein LptG
type: protein_or_peptide / ID: 3 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Escherichia coli (strain K12) (bacteria) / Strain: K12
Molecular weightTheoretical: 39.65141 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 DEELGGISIY AFNENRRLQS VRYAATAKFD PEHKVWRLSQ VDESDLTNPK QITGSQTVSG TWKTNLTPDK LG VVALDPD ALSISGLHNY VKYLKSSGQD AGRYQLNMWS KIFQPLSVAV MMLMALSFIF GPLRSVPMGV RVVTGISFGF VFY VLDQIF GPLTLVYGIP PIIGALLPSA SFFLISLWLL MRKS

UniProtKB: Lipopolysaccharide export system permease protein LptG

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Macromolecule #4: ADP ORTHOVANADATE

MacromoleculeName: ADP ORTHOVANADATE / type: ligand / ID: 4 / Number of copies: 2 / Formula: AOV
Molecular weightTheoretical: 544.156 Da
Chemical component information

ChemComp-AOV:
ADP ORTHOVANADATE / energy-carrying molecule analogue*YM

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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

Concentration4 mg/mL
BufferpH: 8
GridDetails: unspecified
VitrificationCryogen name: ETHANE
Detailsnanodisc incorporated LptB2FG

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Electron microscopy

MicroscopeFEI POLARA 300
Image recordingFilm or detector model: GATAN K2 SUMMIT (4k x 4k) / Average electron dose: 52.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD
Experimental equipment
Model: Tecnai Polara / Image courtesy: FEI Company

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Image processing

Startup modelType of model: INSILICO MODEL
Final reconstructionApplied symmetry - Point group: C1 (asymmetric) / Resolution.type: BY AUTHOR / Resolution: 4.1 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 55624
Initial angle assignmentType: PROJECTION MATCHING
Final angle assignmentType: PROJECTION MATCHING
FSC plot (resolution estimation)

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