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Basic information
| Entry | Database: PDB / ID: 7v8i | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Title | LolCD(E171Q)E with bound AMPPNP in nanodiscs | ||||||||||||
|  Components | 
 | ||||||||||||
|  Keywords | MEMBRANE PROTEIN / ABC transporter / lipoprotein | ||||||||||||
| Function / homology |  Function and homology information lipoprotein releasing activity / protein localization to outer membrane / lipoprotein localization to outer membrane / plasma membrane protein complex / Translocases; Catalysing the translocation of other compounds; Linked to the hydrolysis of a nucleoside triphosphate / lipoprotein transport / transmembrane transporter activity / ATP-binding cassette (ABC) transporter complex / transmembrane transport / outer membrane-bounded periplasmic space ...lipoprotein releasing activity / protein localization to outer membrane / lipoprotein localization to outer membrane / plasma membrane protein complex / Translocases; Catalysing the translocation of other compounds; Linked to the hydrolysis of a nucleoside triphosphate / lipoprotein transport / transmembrane transporter activity / ATP-binding cassette (ABC) transporter complex / transmembrane transport / outer membrane-bounded periplasmic space / ATP hydrolysis activity / ATP binding / plasma membrane Similarity search - Function | ||||||||||||
| Biological species |   Escherichia coli K-12 (bacteria) | ||||||||||||
| Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.6 Å | ||||||||||||
|  Authors | Bei, W.W. / Luo, Q.S. / Shi, H.G. / Zhang, X.Z. / Huang, Y.H. | ||||||||||||
| Funding support |  China, 3items 
 | ||||||||||||
|  Citation |  Journal: PLoS Biol / Year: 2022 Title: Cryo-EM structures of LolCDE reveal the molecular mechanism of bacterial lipoprotein sorting in Escherichia coli. Authors: Weiwei Bei / Qingshan Luo / Huigang Shi / Haizhen Zhou / Min Zhou / Xinzheng Zhang / Yihua Huang /  Abstract: Bacterial lipoproteins perform a diverse array of functions including bacterial envelope biogenesis and microbe-host interactions. Lipoproteins in gram-negative bacteria are sorted to the outer ...Bacterial lipoproteins perform a diverse array of functions including bacterial envelope biogenesis and microbe-host interactions. Lipoproteins in gram-negative bacteria are sorted to the outer membrane (OM) via the localization of lipoproteins (Lol) export pathway. The ATP-binding cassette (ABC) transporter LolCDE initiates the Lol pathway by selectively extracting and transporting lipoproteins for trafficking. Here, we report cryo-EM structures of LolCDE in apo, lipoprotein-bound, and AMPPNP-bound states at a resolution of 3.5 to 4.2 Å. Structure-based disulfide crosslinking, photo-crosslinking, and functional complementation assay verify the apo-state structure and reveal the molecular details regarding substrate selectivity and substrate entry route. Our studies snapshot 3 functional states of LolCDE in a transport cycle, providing deep insights into the mechanisms that underlie LolCDE-mediated lipoprotein sorting in E. coli. | ||||||||||||
| History | 
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Structure visualization
| Structure viewer | Molecule:  Molmil  Jmol/JSmol | 
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| PDBx/mmCIF format |  7v8i.cif.gz | 227.6 KB | Display |  PDBx/mmCIF format | 
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| PDB format |  pdb7v8i.ent.gz | 178.4 KB | Display |  PDB format | 
| PDBx/mmJSON format |  7v8i.json.gz | Tree view |  PDBx/mmJSON format | |
| Others |  Other downloads | 
-Validation report
| Summary document |  7v8i_validation.pdf.gz | 1 MB | Display |  wwPDB validaton report | 
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| Full document |  7v8i_full_validation.pdf.gz | 1.1 MB | Display | |
| Data in XML |  7v8i_validation.xml.gz | 44.5 KB | Display | |
| Data in CIF |  7v8i_validation.cif.gz | 66.8 KB | Display | |
| Arichive directory |  https://data.pdbj.org/pub/pdb/validation_reports/v8/7v8i  ftp://data.pdbj.org/pub/pdb/validation_reports/v8/7v8i | HTTPS FTP | 
-Related structure data
| Related structure data |  31802MC  7v8lC  7v8mC M: map data used to model this data C: citing same article ( | 
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| Similar structure data | Similarity search - Function & homology  F&H Search | 
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- Assembly
Assembly
| Deposited unit |  
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| 1 | 
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- Components
Components
| #1: Protein | Mass: 43295.516 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.)   Escherichia coli K-12 (bacteria) / Strain: K-12 / Gene: lolC / Production host:   Escherichia coli BL21(DE3) (bacteria) / Strain (production host): BL21(DE3) / References: UniProt: P0ADC3 | ||||||||
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| #2: Protein | Mass: 25470.307 Da / Num. of mol.: 2 Source method: isolated from a genetically manipulated source Source: (gene. exp.)   Escherichia coli K-12 (bacteria) / Strain: K12 / Gene: lolD / Production host:   Escherichia coli BL21(DE3) (bacteria) / Strain (production host): BL21(DE3) References: UniProt: P75957, Translocases; Catalysing the translocation of other compounds; Linked to the hydrolysis of a nucleoside triphosphate #3: Protein |  | Mass: 45385.977 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.)   Escherichia coli K-12 (bacteria) / Strain: K-12 / Gene: lolE / Production host:   Escherichia coli BL21(DE3) (bacteria) / Strain (production host): BL21(DE3) / References: UniProt: P75958 #4: Chemical | #5: Chemical | Has ligand of interest | Y |  | 
-Experimental details
-Experiment
| Experiment | Method: ELECTRON MICROSCOPY | 
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| EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction | 
- Sample preparation
Sample preparation
| Component | Name: LolCD(E171Q)E with bound AMPPNP in nanodiscs / Type: COMPLEX / Entity ID: #1-#3 / Source: RECOMBINANT | 
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| Molecular weight | Experimental value: NO | 
| Source (natural) | Organism:   Escherichia coli (E. coli) | 
| Source (recombinant) | Organism:   Escherichia coli BL21(DE3) (bacteria) | 
| Buffer solution | pH: 8 | 
| Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES | 
| Specimen support | Grid type: Quantifoil R2/2 | 
| Vitrification | Instrument: LEICA EM GP / Cryogen name: NITROGEN / Humidity: 100 % / Chamber temperature: 298 K | 
- Electron microscopy imaging
Electron microscopy imaging
| Experimental equipment |  Model: Talos Arctica / Image courtesy: FEI Company | 
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| Microscopy | Model: FEI TECNAI ARCTICA | 
| Electron gun | Electron source:  FIELD EMISSION GUN / Accelerating voltage: 200 kV / Illumination mode: FLOOD BEAM | 
| Electron lens | Mode: BRIGHT FIELD | 
| Image recording | Electron dose: 60 e/Å2 / Film or detector model: GATAN K2 BASE (4k x 4k) | 
- Processing
Processing
| CTF correction | Type: NONE | 
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| 3D reconstruction | Resolution: 3.6 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 277296 / Symmetry type: POINT | 
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