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Open data
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Basic information
| Entry | ![]() | |||||||||||||||||||||||||||
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| Title | Consensus dimer structure of human telomerase | |||||||||||||||||||||||||||
Map data | Sharpened cryoEM map for the consensus telomerase dimer. | |||||||||||||||||||||||||||
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Keywords | Telomerase / dimer / H/ACA RNP / catalytic core / reverse transcriptase / DNA BINDING PROTEIN | |||||||||||||||||||||||||||
| Biological species | Homo sapiens (human) | |||||||||||||||||||||||||||
| Method | single particle reconstruction / cryo EM / Resolution: 6.2 Å | |||||||||||||||||||||||||||
Authors | Balch S / Sekne Z / Franco-Echevarria E / Ludzia P / Kretsch RC / Sun W / Yu H / Ghanim GE / Sigurdur TR / Ding Y ...Balch S / Sekne Z / Franco-Echevarria E / Ludzia P / Kretsch RC / Sun W / Yu H / Ghanim GE / Sigurdur TR / Ding Y / Das R / Nguyen THD | |||||||||||||||||||||||||||
| Funding support | United Kingdom, United States, European Union, China, 8 items
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Citation | Journal: Science / Year: 2025Title: Cryo-EM structure of human telomerase dimer reveals H/ACA RNP-mediated dimerization. Authors: Sebastian Balch / Zala Sekne / Elsa Franco-Echevarría / Patryk Ludzia / Rachael C Kretsch / Wenqing Sun / Haopeng Yu / George E Ghanim / Sigurdur Thorkelsson / Yiliang Ding / Rhiju Das / ...Authors: Sebastian Balch / Zala Sekne / Elsa Franco-Echevarría / Patryk Ludzia / Rachael C Kretsch / Wenqing Sun / Haopeng Yu / George E Ghanim / Sigurdur Thorkelsson / Yiliang Ding / Rhiju Das / Thi Hoang Duong Nguyen / ![]() Abstract: Telomerase ribonucleoprotein (RNP) synthesizes telomeric repeats at chromosome ends using a telomerase reverse transcriptase (TERT) and a telomerase RNA (hTR in humans). Previous structural work ...Telomerase ribonucleoprotein (RNP) synthesizes telomeric repeats at chromosome ends using a telomerase reverse transcriptase (TERT) and a telomerase RNA (hTR in humans). Previous structural work showed that human telomerase is typically monomeric, containing a single copy of TERT and hTR. Evidence for dimeric complexes exists, although the composition, high-resolution structure, and function remain elusive. Here, we report the cryo-electron microscopy (cryo-EM) structure of a human telomerase dimer bound to telomeric DNA. The structure reveals a 26-subunit assembly and a dimerization interface mediated by the Hinge and ACA box (H/ACA) RNP of telomerase. Premature aging disease mutations map to this interface. Disrupting dimer formation affects RNP assembly, bulk telomerase activity, and telomere maintenance in cells. Our findings address a long-standing enigma surrounding the telomerase dimer and suggest a role for the dimer in telomerase assembly. | |||||||||||||||||||||||||||
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Structure visualization
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Downloads & links
-EMDB archive
| Map data | emd_52976.map.gz | 55.3 MB | EMDB map data format | |
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| Header (meta data) | emd-52976-v30.xml emd-52976.xml | 33.8 KB 33.8 KB | Display Display | EMDB header |
| FSC (resolution estimation) | emd_52976_fsc.xml | 8.9 KB | Display | FSC data file |
| Images | emd_52976.png | 51.9 KB | ||
| Filedesc metadata | emd-52976.cif.gz | 9.1 KB | ||
| Others | emd_52976_additional_1.map.gz emd_52976_half_map_1.map.gz emd_52976_half_map_2.map.gz | 29.5 MB 55.3 MB 55.3 MB | ||
| Archive directory | http://ftp.pdbj.org/pub/emdb/structures/EMD-52976 ftp://ftp.pdbj.org/pub/emdb/structures/EMD-52976 | HTTPS FTP |
-Validation report
| Summary document | emd_52976_validation.pdf.gz | 760.8 KB | Display | EMDB validaton report |
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| Full document | emd_52976_full_validation.pdf.gz | 760.3 KB | Display | |
| Data in XML | emd_52976_validation.xml.gz | 14.8 KB | Display | |
| Data in CIF | emd_52976_validation.cif.gz | 21.5 KB | Display | |
| Arichive directory | https://ftp.pdbj.org/pub/emdb/validation_reports/EMD-52976 ftp://ftp.pdbj.org/pub/emdb/validation_reports/EMD-52976 | HTTPS FTP |
-Related structure data
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Links
| EMDB pages | EMDB (EBI/PDBe) / EMDataResource |
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Map
| File | Download / File: emd_52976.map.gz / Format: CCP4 / Size: 59.6 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) | ||||||||||||||||||||||||||||||||||||
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| Annotation | Sharpened cryoEM map for the consensus telomerase dimer. | ||||||||||||||||||||||||||||||||||||
| Projections & slices | Image control
Images are generated by Spider. | ||||||||||||||||||||||||||||||||||||
| Voxel size | X=Y=Z: 2.118 Å | ||||||||||||||||||||||||||||||||||||
| Density |
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| Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||
| Details | EMDB XML:
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-Supplemental data
-Additional map: CryoEM map for the consensus telomerase dimer.
| File | emd_52976_additional_1.map | ||||||||||||
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| Annotation | CryoEM map for the consensus telomerase dimer. | ||||||||||||
| Projections & Slices |
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| Density Histograms |
-Half map: Half map 2 for the consensus telomerase dimer.
| File | emd_52976_half_map_1.map | ||||||||||||
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| Annotation | Half map 2 for the consensus telomerase dimer. | ||||||||||||
| Projections & Slices |
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| Density Histograms |
-Half map: Half map 1 for the consensus telomerase dimer.
| File | emd_52976_half_map_2.map | ||||||||||||
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| Annotation | Half map 1 for the consensus telomerase dimer. | ||||||||||||
| Projections & Slices |
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| Density Histograms |
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Sample components
+Entire : Consensus dimer of human telomerase
+Supramolecule #1: Consensus dimer of human telomerase
+Macromolecule #1: TERT, telomerase reverse transcriptase
+Macromolecule #3: Histone H2A
+Macromolecule #4: Histone H2B
+Macromolecule #5: H/ACA ribonucleoprotein complex subunit DKC1, Dyskerin
+Macromolecule #6: H/ACA ribonucleoprotein complex subunit 1, GAR1
+Macromolecule #7: H/ACA ribonucleoprotein complex subunit 2, NHP2
+Macromolecule #8: H/ACA ribonucleoprotein complex subunit 3, NOP10
+Macromolecule #9: Telomerase Cajal body protein 1, TCAB1
+Macromolecule #11: Adrenocortical dysplasia homolog, TPP1
+Macromolecule #2: hTR, human telomerase RNA
+Macromolecule #10: DNA (5'-D(P*GP*TP*TP*AP*GP*GP*G)-3')
-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: C-flat / Material: COPPER / Mesh: 400 / Support film - Material: CARBON / Support film - topology: CONTINUOUS / Support film - Film thickness: 5 / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 12 sec. / Pretreatment - Atmosphere: AIR | |||||||||||||||||||||
| Vitrification | Cryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK IV |
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Electron microscopy
| Microscope | FEI TITAN KRIOS |
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| Temperature | Min: 78.0 K |
| Specialist optics | Energy filter - Name: GIF Quantum LS / Energy filter - Slit width: 20 eV |
| Image recording | Film or detector model: GATAN K3 (6k x 4k) / Number grids imaged: 4 / Number real images: 66992 / Average exposure time: 2.5 sec. / Average electron dose: 48.0 e/Å2 |
| Electron beam | Acceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN |
| Electron optics | C2 aperture diameter: 50.0 µm / Calibrated magnification: 45872 / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 2.4 µm / Nominal defocus min: 1.0 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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About Yorodumi




Keywords
Homo sapiens (human)
Authors
United Kingdom,
United States, European Union,
China, 8 items
Citation











Z (Sec.)
Y (Row.)
X (Col.)












































Spodoptera (butterflies/moths)
Processing
FIELD EMISSION GUN



