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- PDB-7okn: Structure of the outer-membrane core complex (inner ring) from a ... -
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Basic information
Entry | Database: PDB / ID: 7okn | ||||||
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Title | Structure of the outer-membrane core complex (inner ring) from a conjugative type IV secretion system | ||||||
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![]() | MEMBRANE PROTEIN / Type IV secretion system / F plasmid / outer-membrane core complex / conjugation | ||||||
Function / homology | Type IV conjugative transfer system protein TraV / Type IV conjugative transfer system lipoprotein (TraV) / Type IV conjugative transfer system lipoprotein TraV![]() | ||||||
Biological species | ![]() | ||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.34 Å | ||||||
![]() | Amin, H. / Ilangovan, A. / Costa, T.R.D. | ||||||
Funding support | ![]()
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![]() | ![]() Title: Architecture of the outer-membrane core complex from a conjugative type IV secretion system. Authors: Himani Amin / Aravindan Ilangovan / Tiago R D Costa / ![]() Abstract: Conjugation is one of the most important processes that bacteria utilize to spread antibiotic resistance genes among bacterial populations. Interbacterial DNA transfer requires a large double ...Conjugation is one of the most important processes that bacteria utilize to spread antibiotic resistance genes among bacterial populations. Interbacterial DNA transfer requires a large double membrane-spanning nanomachine called the type 4 secretion system (T4SS) made up of the inner-membrane complex (IMC), the outer-membrane core complex (OMCC) and the conjugative pilus. The iconic F plasmid-encoded T4SS has been central in understanding conjugation for several decades, however atomic details of its structure are not known. Here, we report the structure of a complete conjugative OMCC encoded by the pED208 plasmid from E. coli, solved by cryo-electron microscopy at 3.3 Å resolution. This 2.1 MDa complex has a unique arrangement with two radial concentric rings, each having a different symmetry eventually contributing to remarkable differences in protein stoichiometry and flexibility in comparison to other OMCCs. Our structure suggests that F-OMCC is a highly dynamic complex, with implications for pilus extension and retraction during conjugation. | ||||||
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Structure visualization
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Structure viewer | Molecule: ![]() ![]() |
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PDBx/mmCIF format | ![]() | 688.8 KB | Display | ![]() |
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PDB format | ![]() | 553.1 KB | Display | ![]() |
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-Validation report
Summary document | ![]() | 740.4 KB | Display | ![]() |
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Full document | ![]() | 753.2 KB | Display | |
Data in XML | ![]() | 85.7 KB | Display | |
Data in CIF | ![]() | 109.8 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 12962MC ![]() 7okoC M: map data used to model this data C: citing same article ( |
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Similar structure data |
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Links
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Assembly
Deposited unit | ![]()
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Components
#1: Protein | Mass: 48802.102 Da / Num. of mol.: 17 Source method: isolated from a genetically manipulated source Details: TraB / Source: (gene. exp.) ![]() ![]() ![]() #2: Protein | Mass: 20928.650 Da / Num. of mol.: 17 Source method: isolated from a genetically manipulated source Details: TraV / Source: (gene. exp.) ![]() ![]() ![]() |
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-Experimental details
-Experiment
Experiment | Method: ELECTRON MICROSCOPY |
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EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction |
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Sample preparation
Component | Name: Outer-membrane core complex (inner ring) / Type: COMPLEX / Entity ID: all / Source: RECOMBINANT |
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Molecular weight | Experimental value: NO |
Source (natural) | Organism: ![]() |
Source (recombinant) | Organism: ![]() ![]() |
Buffer solution | pH: 7.5 |
Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
Vitrification | Cryogen name: ETHANE |
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Electron microscopy imaging
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Microscopy | Model: FEI TITAN KRIOS |
Electron gun | Electron source: ![]() |
Electron lens | Mode: BRIGHT FIELD |
Image recording | Electron dose: 1.3 e/Å2 / Film or detector model: GATAN K3 (6k x 4k) |
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Processing
CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION |
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3D reconstruction | Resolution: 3.34 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 74956 / Symmetry type: POINT |