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Yorodumi- EMDB-50734: RNA Polymerase III Class III Open Mini Pre-Initiation complex 2 (... -
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Basic information
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| Title | RNA Polymerase III Class III Open Mini Pre-Initiation complex 2 (OC2-mini) | |||||||||
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Keywords | RNA Polymerase III / SNAPc / TFIIIB / snRNA / Transcription | |||||||||
| Function / homology | Function and homology informationsnRNA-activating protein complex / snRNA transcription / transcription preinitiation complex assembly / snRNA transcription by RNA polymerase III / bent DNA binding / RNA polymerase III preinitiation complex assembly / RNA Polymerase III Chain Elongation / transcription factor TFIIIB complex / DNA/RNA hybrid binding / calcitonin gene-related peptide receptor activity ...snRNA-activating protein complex / snRNA transcription / transcription preinitiation complex assembly / snRNA transcription by RNA polymerase III / bent DNA binding / RNA polymerase III preinitiation complex assembly / RNA Polymerase III Chain Elongation / transcription factor TFIIIB complex / DNA/RNA hybrid binding / calcitonin gene-related peptide receptor activity / TFIIIC-class transcription factor complex binding / RNA Polymerase III Transcription Termination / RNA polymerase transcription factor SL1 complex / RNA polymerase III type 3 promoter sequence-specific DNA binding / regulation of transcription by RNA polymerase III / snRNA transcription by RNA polymerase II / RPAP3/R2TP/prefoldin-like complex / regulation of transcription by RNA polymerase I / RNA polymerase III general transcription initiation factor activity / RNA polymerase I core promoter sequence-specific DNA binding / DNA polymerase III complex / RNA Polymerase III Transcription Initiation From Type 1 Promoter / RNA Polymerase III Transcription Initiation From Type 2 Promoter / RNA Polymerase III Transcription Initiation From Type 3 Promoter / transcription factor TFIIA complex / RNA Polymerase III Abortive And Retractive Initiation / Cytosolic sensors of pathogen-associated DNA / male pronucleus / female pronucleus / positive regulation of innate immune response / RNA polymerase II general transcription initiation factor binding / nucleobase-containing compound metabolic process / Abortive elongation of HIV-1 transcript in the absence of Tat / FGFR2 alternative splicing / transcription preinitiation complex / RNA Polymerase I Transcription Termination / Viral Messenger RNA Synthesis / MicroRNA (miRNA) biogenesis / Signaling by FGFR2 IIIa TM / transcription factor TFIID complex / RNA polymerase II general transcription initiation factor activity / RNA Pol II CTD phosphorylation and interaction with CE during HIV infection / RNA Pol II CTD phosphorylation and interaction with CE / Formation of the Early Elongation Complex / Formation of the HIV-1 Early Elongation Complex / mRNA Capping / DNA-templated transcription elongation / HIV Transcription Initiation / RNA Polymerase II HIV Promoter Escape / Transcription of the HIV genome / RNA Polymerase II Promoter Escape / RNA Polymerase II Transcription Pre-Initiation And Promoter Opening / RNA Polymerase II Transcription Initiation / RNA Polymerase II Transcription Initiation And Promoter Clearance / PIWI-interacting RNA (piRNA) biogenesis / Processing of Capped Intron-Containing Pre-mRNA / mRNA Splicing - Minor Pathway / positive regulation of transcription by RNA polymerase III / aryl hydrocarbon receptor binding / TFIIB-class transcription factor binding / RNA Polymerase I Transcription Initiation / RNA polymerase II transcribes snRNA genes / Pausing and recovery of Tat-mediated HIV elongation / Tat-mediated HIV elongation arrest and recovery / HIV elongation arrest and recovery / Pausing and recovery of HIV elongation / termination of RNA polymerase I transcription / transcription by RNA polymerase III / positive regulation of transcription initiation by RNA polymerase II / nucleolar large rRNA transcription by RNA polymerase I / transcription initiation at RNA polymerase I promoter / Tat-mediated elongation of the HIV-1 transcript / Formation of HIV-1 elongation complex containing HIV-1 Tat / RNA polymerase II core promoter sequence-specific DNA binding / core promoter sequence-specific DNA binding / RNA polymerase II preinitiation complex assembly / Formation of HIV elongation complex in the absence of HIV Tat / termination of RNA polymerase III transcription / transcription initiation at RNA polymerase III promoter / RNA polymerase I complex / RNA Polymerase II Transcription Elongation / RNA polymerase III complex / Formation of RNA Pol II elongation complex / RNA polymerase II, core complex / tRNA transcription by RNA polymerase III / transcription by RNA polymerase I / transcription elongation by RNA polymerase I / RNA Polymerase II Pre-transcription Events / mRNA Splicing - Major Pathway / mRNA Polyadenylation / positive regulation of interferon-beta production / acrosomal vesicle / TBP-class protein binding / Inhibition of DNA recombination at telomere / SIRT1 negatively regulates rRNA expression / TP53 Regulates Transcription of DNA Repair Genes / Transcriptional regulation by small RNAs / RNA Polymerase I Promoter Escape / DNA-templated transcription initiation / euchromatin Similarity search - Function | |||||||||
| Biological species | Homo sapiens (human) | |||||||||
| Method | single particle reconstruction / cryo EM / Resolution: 4.14 Å | |||||||||
Authors | Shah SZ / Ramsay EP / Cecatiello V / Perry TN / Vannini A | |||||||||
| Funding support | Italy, 1 items
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Citation | Journal: Nat Commun / Year: 2025Title: Structural insights into distinct mechanisms of RNA polymerase II and III recruitment to snRNA promoters. Authors: Syed Zawar Shah / Thomas N Perry / Andrea Graziadei / Valentina Cecatiello / Thangavelu Kaliyappan / Agata D Misiaszek / Christoph W Müller / Ewan P Ramsay / Alessandro Vannini / ![]() Abstract: RNA polymerase III (Pol III) transcribes short, essential RNAs, including the U6 small nuclear RNA (snRNA). At U6 snRNA genes, Pol III is recruited by the snRNA Activating Protein Complex (SNAPc) and ...RNA polymerase III (Pol III) transcribes short, essential RNAs, including the U6 small nuclear RNA (snRNA). At U6 snRNA genes, Pol III is recruited by the snRNA Activating Protein Complex (SNAPc) and a Brf2-containing TFIIIB complex, forming a pre-initiation complex (PIC). Uniquely, SNAPc also recruits Pol II at the remaining splicesosomal snRNA genes (U1, 2, 4 and 5). The mechanism of SNAPc cross-polymerase engagement and the role of the SNAPC2 and SNAPC5 subunits remain poorly defined. Here, we present cryo-EM structures of the full-length SNAPc-containing Pol III PIC assembled on the U6 snRNA promoter in the open and melting states at 3.2-4.2 Å resolution. The structural comparison revealed differences with the Saccharomyces cerevisiae Pol III PIC and the basis of selective SNAPc engagement within Pol III and Pol II PICs. Additionally, crosslinking mass spectrometry localizes SNAPC2 and SNAPC5 near the promoter DNA, expanding upon existing descriptions of snRNA Pol III PIC structure. | |||||||||
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Structure visualization
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Downloads & links
-EMDB archive
| Map data | emd_50734.map.gz | 163.1 MB | EMDB map data format | |
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| Header (meta data) | emd-50734-v30.xml emd-50734.xml | 54.4 KB 54.4 KB | Display Display | EMDB header |
| FSC (resolution estimation) | emd_50734_fsc.xml | 14.9 KB | Display | FSC data file |
| Images | emd_50734.png | 46.3 KB | ||
| Filedesc metadata | emd-50734.cif.gz | 14.2 KB | ||
| Others | emd_50734_half_map_1.map.gz emd_50734_half_map_2.map.gz | 225.5 MB 225.5 MB | ||
| Archive directory | http://ftp.pdbj.org/pub/emdb/structures/EMD-50734 ftp://ftp.pdbj.org/pub/emdb/structures/EMD-50734 | HTTPS FTP |
-Related structure data
| Related structure data | ![]() 9fssMC ![]() 9fsoC ![]() 9fspC ![]() 9fsqC ![]() 9fsrC M: atomic model generated by this map C: citing same article ( |
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| Similar structure data | Similarity search - Function & homology F&H Search |
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Links
| EMDB pages | EMDB (EBI/PDBe) / EMDataResource |
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| Related items in Molecule of the Month |
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Map
| File | Download / File: emd_50734.map.gz / Format: CCP4 / Size: 282.6 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) | ||||||||||||||||||||||||||||||||||||
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| Projections & slices | Image control
Images are generated by Spider. | ||||||||||||||||||||||||||||||||||||
| Voxel size | X=Y=Z: 0.955 Å | ||||||||||||||||||||||||||||||||||||
| Density |
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| Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||
| Details | EMDB XML:
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-Supplemental data
-Half map: #2
| File | emd_50734_half_map_1.map | ||||||||||||
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| Density Histograms |
-Half map: #1
| File | emd_50734_half_map_2.map | ||||||||||||
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| Density Histograms |
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Sample components
+Entire : RNA Polymerase III Class III Open Mini Pre-Initiation complex 2
+Supramolecule #1: RNA Polymerase III Class III Open Mini Pre-Initiation complex 2
+Supramolecule #2: SNAPc
+Supramolecule #3: TFIIIB
+Supramolecule #4: DNA
+Supramolecule #5: RNA Polymerase III
+Macromolecule #1: DNA-directed RNA polymerase III subunit RPC1
+Macromolecule #2: DNA-directed RNA polymerase III subunit RPC2
+Macromolecule #3: DNA-directed RNA polymerase III subunit RPC3
+Macromolecule #4: DNA-directed RNA polymerase III subunit RPC4
+Macromolecule #5: DNA-directed RNA polymerase III subunit RPC5
+Macromolecule #6: DNA-directed RNA polymerase III subunit RPC6
+Macromolecule #7: DNA-directed RNA polymerase III subunit RPC7
+Macromolecule #8: DNA-directed RNA polymerase III subunit RPC8
+Macromolecule #9: DNA-directed RNA polymerase III subunit RPC9
+Macromolecule #10: DNA-directed RNA polymerase III subunit RPC10
+Macromolecule #11: DNA-directed RNA polymerases I and III subunit RPAC1
+Macromolecule #12: DNA-directed RNA polymerases I and III subunit RPAC2
+Macromolecule #13: DNA-directed RNA polymerases I, II, and III subunit RPABC1
+Macromolecule #14: DNA-directed RNA polymerases I, II, and III subunit RPABC2
+Macromolecule #15: DNA-directed RNA polymerases I, II, and III subunit RPABC3
+Macromolecule #16: DNA-directed RNA polymerases I, II, and III subunit RPABC4
+Macromolecule #17: DNA-directed RNA polymerases I, II, and III subunit RPABC5
+Macromolecule #18: TATA-box-binding protein
+Macromolecule #19: Transcription factor IIIB 50 kDa subunit
+Macromolecule #20: Transcription factor TFIIIB component B'' homolog
+Macromolecule #21: snRNA-activating protein complex subunit 1
+Macromolecule #22: snRNA-activating protein complex subunit 4
+Macromolecule #25: snRNA-activating protein complex subunit 3
+Macromolecule #23: U6_2_Template
+Macromolecule #24: U6_2_Non template
+Macromolecule #26: ZINC ION
+Macromolecule #27: MAGNESIUM ION
+Macromolecule #28: IRON/SULFUR CLUSTER
-Experimental details
-Structure determination
| Method | cryo EM |
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Processing | single particle reconstruction |
| Aggregation state | particle |
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Sample preparation
| Buffer | pH: 8 Component:
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| Grid | Model: Quantifoil R1.2/1.3 / Material: COPPER / Mesh: 300 / Support film - Material: CARBON / Support film - topology: CONTINUOUS / Support film - Film thickness: 150 / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 30 sec. | ||||||||||
| Vitrification | Cryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277.15 K / Instrument: FEI VITROBOT MARK IV |
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Electron microscopy
| Microscope | FEI TITAN KRIOS |
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| Specialist optics | Energy filter - Name: TFS Selectris X / Energy filter - Slit width: 10 eV |
| Details | FEI Titan Krios G4 (operating at 300 KeV) |
| Image recording | Film or detector model: TFS FALCON 4i (4k x 4k) / Number real images: 19060 / Average exposure time: 6.26 sec. / Average electron dose: 50.0 e/Å2 |
| Electron beam | Acceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN |
| Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 2.5 µm / Nominal defocus min: 1.0 µm / Nominal magnification: 130000 |
| Sample stage | Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER |
| Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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About Yorodumi



Keywords
Homo sapiens (human)
Authors
Italy, 1 items
Citation
































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Y (Row.)
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Trichoplusia ni (cabbage looper)
Processing
FIELD EMISSION GUN

