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- EMDB-18496: Structure of the plastid-encoded RNA polymerase complex (PEP) fro... -
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Open data
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Basic information
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Title | Structure of the plastid-encoded RNA polymerase complex (PEP) from Sinapis alba | ||||||||||||||||||
![]() | Composite Map (Map G). | ||||||||||||||||||
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![]() | Transcription / Chloroplasts / Gene Expression / RNA / Polymerase | ||||||||||||||||||
Function / homology | ![]() : / chloroplast / : / : / : / DNA-directed RNA polymerase complex / : / : / : / ribonucleoside binding ...: / chloroplast / : / : / : / DNA-directed RNA polymerase complex / : / : / : / ribonucleoside binding / DNA-directed RNA polymerase / protein dimerization activity / magnesium ion binding / DNA binding / zinc ion binding Similarity search - Function | ||||||||||||||||||
Biological species | ![]() | ||||||||||||||||||
Method | single particle reconstruction / cryo EM / Resolution: 3.5 Å | ||||||||||||||||||
![]() | do Prado PFV / Ahrens FM / Pfannschmidt T / Hillen HS | ||||||||||||||||||
Funding support | ![]()
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![]() | ![]() Title: Structure of the multi-subunit chloroplast RNA polymerase. Authors: Paula F V do Prado / Frederik M Ahrens / Monique Liebers / Noah Ditz / Hans-Peter Braun / Thomas Pfannschmidt / Hauke S Hillen / ![]() Abstract: Chloroplasts contain a dedicated genome that encodes subunits of the photosynthesis machinery. Transcription of photosynthesis genes is predominantly carried out by a plastid-encoded RNA polymerase ...Chloroplasts contain a dedicated genome that encodes subunits of the photosynthesis machinery. Transcription of photosynthesis genes is predominantly carried out by a plastid-encoded RNA polymerase (PEP), a nearly 1 MDa complex composed of core subunits with homology to eubacterial RNA polymerases (RNAPs) and at least 12 additional chloroplast-specific PEP-associated proteins (PAPs). However, the architecture of this complex and the functions of the PAPs remain unknown. Here, we report the cryo-EM structure of a 19-subunit PEP complex from Sinapis alba (white mustard). The structure reveals that the PEP core resembles prokaryotic and nuclear RNAPs but contains chloroplast-specific features that mediate interactions with the PAPs. The PAPs are unrelated to known transcription factors and arrange around the core in a unique fashion. Their structures suggest potential functions during transcription in the chemical environment of chloroplasts. These results reveal structural insights into chloroplast transcription and provide a framework for understanding photosynthesis gene expression. | ||||||||||||||||||
History |
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Structure visualization
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 291 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 36.1 KB 36.1 KB | Display Display | ![]() |
Images | ![]() | 72.8 KB | ||
Filedesc metadata | ![]() | 12.3 KB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Validation report
Summary document | ![]() | 515.5 KB | Display | ![]() |
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Full document | ![]() | 515 KB | Display | |
Data in XML | ![]() | 7.3 KB | Display | |
Data in CIF | ![]() | 8.5 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 8qmaMC C: citing same article ( M: atomic model generated by this map |
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Similar structure data | Similarity search - Function & homology ![]() |
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Links
EMDB pages | ![]() ![]() |
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Related items in Molecule of the Month |
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Map
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Annotation | Composite Map (Map G). | ||||||||||||||||||||||||||||||||||||
Projections & slices | Image control
Images are generated by Spider. | ||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 1.05 Å | ||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
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-Supplemental data
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Sample components
+Entire : Plastid-encoded DNA-dependent RNA polymerase (PEP)
+Supramolecule #1: Plastid-encoded DNA-dependent RNA polymerase (PEP)
+Macromolecule #1: PAP4
+Macromolecule #2: PAP5
+Macromolecule #3: PAP8
+Macromolecule #4: PAP9
+Macromolecule #5: PAP10
+Macromolecule #6: PAP11
+Macromolecule #7: PAP12 (DNA-directed RNA polymerase subunit omega)
+Macromolecule #8: PTAC18
+Macromolecule #9: PAP6
+Macromolecule #10: DNA-directed RNA polymerase subunit beta
+Macromolecule #11: DNA-directed RNA polymerase subunit beta''
+Macromolecule #12: DNA-directed RNA polymerase subunit alpha
+Macromolecule #13: PAP1
+Macromolecule #14: PAP3
+Macromolecule #15: FLN2
+Macromolecule #16: PAP7
+Macromolecule #17: DNA-directed RNA polymerase subunit beta'
+Macromolecule #18: FE (III) ION
+Macromolecule #19: ZINC ION
+Macromolecule #20: S-ADENOSYLMETHIONINE
-Experimental details
-Structure determination
Method | cryo EM |
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![]() | single particle reconstruction |
Aggregation state | particle |
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Sample preparation
Buffer | pH: 7.6 Component:
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Grid | Model: Quantifoil R2/1 / Material: COPPER | |||||||||||||||||||||
Vitrification | Cryogen name: ETHANE / Chamber humidity: 95 % / Chamber temperature: 277.15 K / Instrument: FEI VITROBOT MARK IV |
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Electron microscopy
Microscope | FEI TITAN KRIOS |
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Image recording | Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Average exposure time: 2.7 sec. / Average electron dose: 40.0 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | Illumination mode: OTHER / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 2.0 µm / Nominal defocus min: 0.5 µm / Nominal magnification: 81000 |
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
Startup model | Type of model: INSILICO MODEL |
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Final reconstruction | Algorithm: BACK PROJECTION / Resolution.type: BY AUTHOR / Resolution: 3.5 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 123874 |
Initial angle assignment | Type: MAXIMUM LIKELIHOOD |
Final angle assignment | Type: MAXIMUM LIKELIHOOD |