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Open data
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Basic information
Entry | Database: PDB / ID: 6sln | ||||||
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Title | Structure of the RagAB peptide transporter | ||||||
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![]() | MEMBRANE PROTEIN / outer membrane protein / Bacteroidetes / TonB dependent transporter | ||||||
Function / homology | ![]() | ||||||
Biological species | ![]() ![]() | ||||||
Method | ![]() ![]() ![]() | ||||||
![]() | Madej, M. / Ranson, N.A. / White, J.B.R. | ||||||
![]() | ![]() Title: Structural and functional insights into oligopeptide acquisition by the RagAB transporter from Porphyromonas gingivalis. Authors: Mariusz Madej / Joshua B R White / Zuzanna Nowakowska / Shaun Rawson / Carsten Scavenius / Jan J Enghild / Grzegorz P Bereta / Karunakar Pothula / Ulrich Kleinekathoefer / Arnaud Baslé / ...Authors: Mariusz Madej / Joshua B R White / Zuzanna Nowakowska / Shaun Rawson / Carsten Scavenius / Jan J Enghild / Grzegorz P Bereta / Karunakar Pothula / Ulrich Kleinekathoefer / Arnaud Baslé / Neil A Ranson / Jan Potempa / Bert van den Berg / ![]() ![]() ![]() ![]() ![]() Abstract: Porphyromonas gingivalis, an asaccharolytic member of the Bacteroidetes, is a keystone pathogen in human periodontitis that may also contribute to the development of other chronic inflammatory ...Porphyromonas gingivalis, an asaccharolytic member of the Bacteroidetes, is a keystone pathogen in human periodontitis that may also contribute to the development of other chronic inflammatory diseases. P. gingivalis utilizes protease-generated peptides derived from extracellular proteins for growth, but how these peptides enter the cell is not clear. Here, we identify RagAB as the outer-membrane importer for these peptides. X-ray crystal structures show that the transporter forms a dimeric RagAB complex, with the RagB substrate-binding surface-anchored lipoprotein forming a closed lid on the RagA TonB-dependent transporter. Cryo-electron microscopy structures reveal the opening of the RagB lid and thus provide direct evidence for a 'pedal bin' mechanism of nutrient uptake. Together with mutagenesis, peptide-binding studies and RagAB peptidomics, our work identifies RagAB as a dynamic, selective outer-membrane oligopeptide-acquisition machine that is essential for the efficient utilization of proteinaceous nutrients by P. gingivalis. | ||||||
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Structure visualization
Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 1.3 MB | Display | ![]() |
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PDB format | ![]() | 921.8 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Summary document | ![]() | 2 MB | Display | ![]() |
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Full document | ![]() | 2 MB | Display | |
Data in XML | ![]() | 105.2 KB | Display | |
Data in CIF | ![]() | 142.4 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 6sliSC ![]() 6sljC ![]() 6sm3C ![]() 6smlC ![]() 6smqC S: Starting model for refinement 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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Unit cell |
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Components
-Protein , 2 types, 4 molecules ABCD
#1: Protein | Mass: 110162.195 Da / Num. of mol.: 2 / Source method: isolated from a natural source Source: (natural) ![]() Strain: ATCC BAA-308 / W83 / References: UniProt: Q7MXJ7 #2: Protein | Mass: 55259.734 Da / Num. of mol.: 2 / Source method: isolated from a natural source Source: (natural) ![]() Strain: ATCC BAA-308 / W83 / References: UniProt: F5H948 |
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-Protein/peptide / Sugars , 2 types, 6 molecules PQ

#3: Protein/peptide | Mass: 1205.218 Da / Num. of mol.: 2 / Source method: obtained synthetically / Source: (synth.) ![]() #5: Sugar | ChemComp-LMT / |
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-Non-polymers , 4 types, 529 molecules 






#4: Chemical | #6: Chemical | #7: Chemical | #8: Water | ChemComp-HOH / | |
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-Details
Has ligand of interest | N |
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-Experimental details
-Experiment
Experiment | Method: ![]() |
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Sample preparation
Crystal | Density Matthews: 3.71 Å3/Da / Density % sol: 66.88 % |
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Crystal grow | Temperature: 293 K / Method: vapor diffusion / pH: 4.5 Details: 15% PEG1000 0.05 M Li-sulphate 0.05 M Na-phosphate monobasic 0.08 M Na-citrate |
-Data collection
Diffraction | Mean temperature: 100 K / Serial crystal experiment: N |
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Diffraction source | Source: ![]() ![]() ![]() |
Detector | Type: DECTRIS PILATUS 6M-F / Detector: PIXEL / Date: Jun 22, 2019 |
Radiation | Protocol: SINGLE WAVELENGTH / Monochromatic (M) / Laue (L): M / Scattering type: x-ray |
Radiation wavelength | Wavelength: 0.917 Å / Relative weight: 1 |
Reflection | Resolution: 2.61→142.7 Å / Num. obs: 141223 / % possible obs: 99.9 % / Redundancy: 7.3 % / Biso Wilson estimate: 43.15 Å2 / CC1/2: 0.995 / Rpim(I) all: 0.102 / Rrim(I) all: 0.278 / Net I/σ(I): 5.6 |
Reflection shell | Resolution: 2.61→2.65 Å / Mean I/σ(I) obs: 1 / Num. unique obs: 6762 / CC1/2: 0.53 / Rpim(I) all: 0.752 / Rrim(I) all: 2.079 |
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Processing
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Refinement | Method to determine structure: ![]() Starting model: 6SLI Resolution: 2.61→123.96 Å / SU ML: 0.4013 / Cross valid method: FREE R-VALUE / σ(F): 1.33 / Phase error: 29.9094
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Solvent computation | Shrinkage radii: 0.9 Å / VDW probe radii: 1.11 Å | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Displacement parameters | Biso mean: 54.61 Å2 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Refinement step | Cycle: LAST / Resolution: 2.61→123.96 Å
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Refine LS restraints |
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LS refinement shell |
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Refinement TLS params. | Method: refined / Refine-ID: X-RAY DIFFRACTION
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Refinement TLS group |
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