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Open data
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Basic information
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Title | Consensus dimer structure of human telomerase | |||||||||||||||||||||||||||
![]() | Sharpened cryoEM map for the consensus telomerase dimer. | |||||||||||||||||||||||||||
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![]() | Telomerase / dimer / H/ACA RNP / catalytic core / reverse transcriptase / DNA BINDING PROTEIN | |||||||||||||||||||||||||||
Biological species | ![]() | |||||||||||||||||||||||||||
Method | single particle reconstruction / cryo EM / Resolution: 6.2 Å | |||||||||||||||||||||||||||
![]() | 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 | ![]() ![]() ![]()
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![]() | ![]() Title: 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. | |||||||||||||||||||||||||||
History |
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Structure visualization
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 55.3 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 33.8 KB 33.8 KB | Display Display | ![]() |
FSC (resolution estimation) | ![]() | 8.9 KB | Display | ![]() |
Images | ![]() | 51.9 KB | ||
Filedesc metadata | ![]() | 9.1 KB | ||
Others | ![]() ![]() ![]() | 29.5 MB 55.3 MB 55.3 MB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Validation report
Summary document | ![]() | 760.8 KB | Display | ![]() |
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Full document | ![]() | 760.3 KB | Display | |
Data in XML | ![]() | 14.8 KB | Display | |
Data in CIF | ![]() | 21.5 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
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Links
EMDB pages | ![]() ![]() |
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Map
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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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![]() | 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: ![]() |
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 |