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- EMDB-12749: In situ cryo-electron tomogram of a pyrenoid inside a Chlamydomon... -
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Open data
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Basic information
Entry | Database: EMDB / ID: EMD-12749 | |||||||||
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Title | In situ cryo-electron tomogram of a pyrenoid inside a Chlamydomonas reinhardtii cell | |||||||||
![]() | In situ cryo-electron tomogram of a pyrenoid inside a Chlamydomonas reinhardtii cell (bin4). A denoised version of this tomogram is included in the bundle. | |||||||||
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Biological species | ![]() ![]() | |||||||||
Method | electron tomography / cryo EM | |||||||||
![]() | Cuellar LK / Schaffer M / Strauss M / Martinez-Sanchez A / Plitzko JM / Foerster F / Engel BD | |||||||||
Funding support | ![]()
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![]() | ![]() Title: The Eukaryotic CO-Concentrating Organelle Is Liquid-like and Exhibits Dynamic Reorganization. Authors: Elizabeth S Freeman Rosenzweig / Bin Xu / Luis Kuhn Cuellar / Antonio Martinez-Sanchez / Miroslava Schaffer / Mike Strauss / Heather N Cartwright / Pierre Ronceray / Jürgen M Plitzko / ...Authors: Elizabeth S Freeman Rosenzweig / Bin Xu / Luis Kuhn Cuellar / Antonio Martinez-Sanchez / Miroslava Schaffer / Mike Strauss / Heather N Cartwright / Pierre Ronceray / Jürgen M Plitzko / Friedrich Förster / Ned S Wingreen / Benjamin D Engel / Luke C M Mackinder / Martin C Jonikas / ![]() ![]() Abstract: Approximately 30%-40% of global CO fixation occurs inside a non-membrane-bound organelle called the pyrenoid, which is found within the chloroplasts of most eukaryotic algae. The pyrenoid matrix is ...Approximately 30%-40% of global CO fixation occurs inside a non-membrane-bound organelle called the pyrenoid, which is found within the chloroplasts of most eukaryotic algae. The pyrenoid matrix is densely packed with the CO-fixing enzyme Rubisco and is thought to be a crystalline or amorphous solid. Here, we show that the pyrenoid matrix of the unicellular alga Chlamydomonas reinhardtii is not crystalline but behaves as a liquid that dissolves and condenses during cell division. Furthermore, we show that new pyrenoids are formed both by fission and de novo assembly. Our modeling predicts the existence of a "magic number" effect associated with special, highly stable heterocomplexes that influences phase separation in liquid-like organelles. This view of the pyrenoid matrix as a phase-separated compartment provides a paradigm for understanding its structure, biogenesis, and regulation. More broadly, our findings expand our understanding of the principles that govern the architecture and inheritance of liquid-like organelles. | |||||||||
History |
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Structure visualization
Movie |
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Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 329.7 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 14 KB 14 KB | Display Display | ![]() |
Images | ![]() | 155.9 KB | ||
Others | ![]() | 319.1 MB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Validation report
Summary document | ![]() | 319.3 KB | Display | ![]() |
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Full document | ![]() | 318.8 KB | Display | |
Data in XML | ![]() | 3.7 KB | Display | |
Data in CIF | ![]() | 4.4 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 3694C C: citing same article ( |
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EM raw data | ![]() Data size: 5.8 Data #1: Phase-flipped and aligned tilt series of a pyrenoid inside a Chlamydomonas reinhardtii cell [tilt series]) |
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Links
EMDB pages | ![]() ![]() |
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Map
File | ![]() | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Annotation | In situ cryo-electron tomogram of a pyrenoid inside a Chlamydomonas reinhardtii cell (bin4). A denoised version of this tomogram is included in the bundle. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 13.68 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
CCP4 map header:
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-Supplemental data
-Additional map: Denoised tomogram by deconvolving with an ad-hoc Wiener filter.
File | emd_12749_additional_1.map | ||||||||||||
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Annotation | Denoised tomogram by deconvolving with an ad-hoc Wiener filter. | ||||||||||||
Projections & Slices |
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Density Histograms |
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Sample components
-Entire : Pyrenoid
Entire | Name: Pyrenoid |
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Components |
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-Supramolecule #1: Pyrenoid
Supramolecule | Name: Pyrenoid / type: organelle_or_cellular_component / ID: 1 / Parent: 0 |
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Source (natural) | Organism: ![]() ![]() |
-Experimental details
-Structure determination
Method | cryo EM |
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![]() | electron tomography |
Aggregation state | cell |
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Sample preparation
Buffer | pH: 7 |
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Grid | Model: Quantifoil R2/1 / Material: COPPER / Mesh: 200 / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Atmosphere: AIR |
Vitrification | Cryogen name: ETHANE-PROPANE / Instrument: FEI VITROBOT MARK IV |
Sectioning | Focused ion beam - Instrument: OTHER / Focused ion beam - Ion: OTHER / Focused ion beam - Voltage: 30 kV / Focused ion beam - Current: 0.03 nA / Focused ion beam - Duration: 1800 sec. / Focused ion beam - Temperature: 91 K / Focused ion beam - Initial thickness: 8000 nm / Focused ion beam - Final thickness: 300 nm Focused ion beam - Details: See https://bio-protocol.org/e1575 for detailed procedure.. The value given for _emd_sectioning_focused_ion_beam.instrument is FEI Quanta FIB. This is not in a list of ...Focused ion beam - Details: See https://bio-protocol.org/e1575 for detailed procedure.. The value given for _emd_sectioning_focused_ion_beam.instrument is FEI Quanta FIB. This is not in a list of allowed values {'OTHER', 'DB235'} so OTHER is written into the XML file. |
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Electron microscopy
Microscope | FEI TITAN KRIOS |
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Image recording | Film or detector model: GATAN K2 BASE (4k x 4k) / Average exposure time: 1.0 sec. / Average electron dose: 2.0 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | C2 aperture diameter: 70.0 µm / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal magnification: 42000 |
Sample stage | Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN |
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Image processing
Final reconstruction | Algorithm: BACK PROJECTION / Software - Name: ![]() |
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