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Open data
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Basic information
Entry | Database: PDB / ID: 8bqe | |||||||||
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Title | In situ structure of the Caulobacter crescentus S-layer | |||||||||
![]() | S-layer protein rsaA | |||||||||
![]() | STRUCTURAL PROTEIN / RsaA S-layer sub-tomogram averaging Caulobacter | |||||||||
Function / homology | RsaA N-terminal domain / RTX calcium-binding nonapeptide repeat / RTX calcium-binding nonapeptide repeat (4 copies) / Serralysin-like metalloprotease, C-terminal / calcium ion binding / S-layer protein rsaA![]() | |||||||||
Biological species | ![]() | |||||||||
Method | ELECTRON MICROSCOPY / subtomogram averaging / cryo EM / Resolution: 3.5 Å | |||||||||
![]() | von Kuegelgen, A. / Bharat, T. | |||||||||
Funding support | ![]()
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![]() | ![]() Title: A Bayesian approach to single-particle electron cryo-tomography in RELION-4.0. Authors: Jasenko Zivanov / Joaquín Otón / Zunlong Ke / Andriko von Kügelgen / Euan Pyle / Kun Qu / Dustin Morado / Daniel Castaño-Díez / Giulia Zanetti / Tanmay A M Bharat / John A G Briggs / Sjors H W Scheres / ![]() ![]() ![]() ![]() Abstract: We present a new approach for macromolecular structure determination from multiple particles in electron cryo-tomography (cryo-ET) data sets. Whereas existing subtomogram averaging approaches are ...We present a new approach for macromolecular structure determination from multiple particles in electron cryo-tomography (cryo-ET) data sets. Whereas existing subtomogram averaging approaches are based on 3D data models, we propose to optimise a regularised likelihood target that approximates a function of the 2D experimental images. In addition, analogous to Bayesian polishing and contrast transfer function (CTF) refinement in single-particle analysis, we describe the approaches that exploit the increased signal-to-noise ratio in the averaged structure to optimise tilt-series alignments, beam-induced motions of the particles throughout the tilt-series acquisition, defoci of the individual particles, as well as higher-order optical aberrations of the microscope. Implementation of our approaches in the open-source software package RELION aims to facilitate their general use, particularly for those researchers who are already familiar with its single-particle analysis tools. We illustrate for three applications that our approaches allow structure determination from cryo-ET data to resolutions sufficient for de novo atomic modelling. #1: ![]() Title: A Bayesian approach to single-particle electron cryo-tomography in RELION-4.0 Authors: Zivanov, J. / Oton, J. / Ke, Z. / von Kuegelgen, A. / Pyle, E. / Qu, K. / Morado, D. / Castano-Diez, D. / Zanetti, G. / Bharat, T.A.M. / Briggs, J.A.G. / Scheres, S.H.W. | |||||||||
History |
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Structure visualization
Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 332.8 KB | Display | ![]() |
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PDB format | ![]() | 227.6 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Arichive directory | ![]() ![]() | HTTPS FTP |
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-Related structure data
Related structure data | ![]() 16183MC ![]() 8bshC M: map data used to model this data C: citing same article ( |
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Similar structure data | Similarity search - Function & homology ![]() |
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Links
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Assembly
Deposited unit | ![]()
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Components
#1: Protein | Mass: 98153.906 Da / Num. of mol.: 6 Source method: isolated from a genetically manipulated source Details: In-situ S-layer Source: (gene. exp.) ![]() Strain: NA1000 / CB15N / Gene: rsaA, CCNA_01059 / Production host: ![]() #2: Polysaccharide | 4-acetamido-4,6-dideoxy-alpha-D-mannopyranose-(1-3)-beta-D-mannopyranose-(1-3)-4-acetamido-4,6- ...4-acetamido-4,6-dideoxy-alpha-D-mannopyranose-(1-3)-beta-D-mannopyranose-(1-3)-4-acetamido-4,6-dideoxy-alpha-D-mannopyranose-(1-3)-4-acetamido-4,6-dideoxy-alpha-D-mannopyranose-(1-3)-beta-D-mannopyranose-(1-3)-4-acetamido-4,6-dideoxy-alpha-D-mannopyranose Type: oligosaccharide / Mass: 1091.068 Da / Num. of mol.: 12 Source method: isolated from a genetically manipulated source #3: Chemical | ChemComp-CA / Has ligand of interest | Y | |
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-Experimental details
-Experiment
Experiment | Method: ELECTRON MICROSCOPY |
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EM experiment | Aggregation state: CELL / 3D reconstruction method: subtomogram averaging |
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Sample preparation
Component | Name: Caulobacter crescentus S-layer / Type: ORGANELLE OR CELLULAR COMPONENT / Details: Caulobacter crescentus S-layer / Entity ID: #1 / Source: NATURAL |
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Molecular weight | Experimental value: NO |
Source (natural) | Organism: ![]() |
Buffer solution | pH: 7 / Details: PYE medium |
Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES / Details: Caulobacter crescentus stalk |
Specimen support | Details: 15 mA / Grid material: COPPER/RHODIUM / Grid mesh size: 200 divisions/in. / Grid type: Quantifoil R2/2 |
Vitrification | Instrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 283.15 K / Details: 1.5 s blot |
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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 / Nominal magnification: 105000 X / Calibrated magnification: 105000 X / Nominal defocus max: 5000 nm / Nominal defocus min: 2000 nm / Calibrated defocus min: 2000 nm / Calibrated defocus max: 5000 nm / Cs: 2.7 mm / C2 aperture diameter: 70 µm / Alignment procedure: COMA FREE |
Specimen holder | Cryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Temperature (max): 70 K / Temperature (min): 70 K |
Image recording | Average exposure time: 1 sec. / Electron dose: 3.4 e/Å2 / Avg electron dose per subtomogram: 140 e/Å2 / Detector mode: SUPER-RESOLUTION / Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Num. of real images: 1 / Details: Dose symmetric tilt scheme (Hagen et al, JSB) |
EM imaging optics | Energyfilter name: GIF Quantum LS / Chromatic aberration corrector: not used / Energyfilter slit width: 20 eV / Spherical aberration corrector: not used |
Image scans | Movie frames/image: 10 / Used frames/image: 1-10 |
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Processing
Software | Name: PHENIX / Version: 1.19_4092: / Classification: refinement | ||||||||||||||||||||||||||||||||||||
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EM software |
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CTF correction | Details: PseudoSubtomograms as described in Zivanov 2022 (https://www.biorxiv.org/content/10.1101/2022.02.28.482229v2.abstract) Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||||||||||||||
Symmetry | Point symmetry: C6 (6 fold cyclic) | ||||||||||||||||||||||||||||||||||||
3D reconstruction | Resolution: 3.5 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 42990 / Algorithm: FOURIER SPACE / Num. of class averages: 3 / Symmetry type: POINT | ||||||||||||||||||||||||||||||||||||
EM volume selection | Method: EMD-10388 / Details: RELION subtomogram averaging / Num. of tomograms: 110 / Num. of volumes extracted: 51866 / Reference model: EMDF | ||||||||||||||||||||||||||||||||||||
Atomic model building | Protocol: RIGID BODY FIT / Space: REAL | ||||||||||||||||||||||||||||||||||||
Refine LS restraints |
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