+Open data
-Basic information
Entry | Database: EMDB / ID: EMD-14196 | |||||||||
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Title | Cryo-EM map of human telomerase-DNA-TPP1 complex (sharpened) | |||||||||
Map data | Post-processed map of DNA-bound human telomerase in complex with TPP1 | |||||||||
Sample |
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Function / homology | Function and homology information positive regulation of hair cycle / template-free RNA nucleotidyltransferase / positive regulation of transdifferentiation / TERT-RMRP complex / DNA strand elongation / RNA-directed RNA polymerase complex / telomerase catalytic core complex / siRNA transcription / positive regulation of protein localization to nucleolus / telomerase activity ...positive regulation of hair cycle / template-free RNA nucleotidyltransferase / positive regulation of transdifferentiation / TERT-RMRP complex / DNA strand elongation / RNA-directed RNA polymerase complex / telomerase catalytic core complex / siRNA transcription / positive regulation of protein localization to nucleolus / telomerase activity / telomerase RNA reverse transcriptase activity / RNA-templated DNA biosynthetic process / establishment of protein localization to telomere / shelterin complex / nuclear telomere cap complex / siRNA processing / telomerase RNA binding / telomere capping / telomerase holoenzyme complex / positive regulation of vascular associated smooth muscle cell migration / telomeric DNA binding / DNA biosynthetic process / RNA-templated transcription / positive regulation of stem cell proliferation / mitochondrial nucleoid / negative regulation of cellular senescence / Telomere Extension By Telomerase / positive regulation of Wnt signaling pathway / telomere maintenance via telomerase / replicative senescence / negative regulation of extrinsic apoptotic signaling pathway in absence of ligand / positive regulation of G1/S transition of mitotic cell cycle / response to cadmium ion / negative regulation of endothelial cell apoptotic process / positive regulation of telomerase activity / positive regulation of vascular associated smooth muscle cell proliferation / telomere maintenance / mitochondrion organization / positive regulation of nitric-oxide synthase activity / positive regulation of glucose import / Formation of the beta-catenin:TCF transactivating complex / regulation of protein stability / transcription coactivator binding / PML body / positive regulation of miRNA transcription / RNA-directed DNA polymerase / structural constituent of chromatin / positive regulation of angiogenesis / RNA-directed DNA polymerase activity / nucleosome / positive regulation of protein binding / cellular response to hypoxia / protein-folding chaperone binding / negative regulation of neuron apoptotic process / tRNA binding / chromosome, telomeric region / nuclear body / nuclear speck / protein heterodimerization activity / RNA-dependent RNA polymerase activity / negative regulation of gene expression / nucleolus / protein homodimerization activity / DNA binding / RNA binding / nucleoplasm / identical protein binding / metal ion binding / nucleus / plasma membrane / cytosol Similarity search - Function | |||||||||
Biological species | Homo sapiens (human) / human (human) | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 3.2 Å | |||||||||
Authors | Sekne Z / Ghanim GE / van Roon AMM / Nguyen THD | |||||||||
Funding support | United Kingdom, United States, 2 items
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Citation | Journal: Science / Year: 2022 Title: Structural basis of human telomerase recruitment by TPP1-POT1. Authors: Zala Sekne / George E Ghanim / Anne-Marie M van Roon / Thi Hoang Duong Nguyen / Abstract: Telomerase maintains genome stability by extending the 3' telomeric repeats at eukaryotic chromosome ends, thereby counterbalancing progressive loss caused by incomplete genome replication. In ...Telomerase maintains genome stability by extending the 3' telomeric repeats at eukaryotic chromosome ends, thereby counterbalancing progressive loss caused by incomplete genome replication. In mammals, telomerase recruitment to telomeres is mediated by TPP1, which assembles as a heterodimer with POT1. We report structures of DNA-bound telomerase in complex with TPP1 and with TPP1-POT1 at 3.2- and 3.9-angstrom resolution, respectively. Our structures define interactions between telomerase and TPP1-POT1 that are crucial for telomerase recruitment to telomeres. The presence of TPP1-POT1 stabilizes the DNA, revealing an unexpected path by which DNA exits the telomerase active site and a DNA anchor site on telomerase that is important for telomerase processivity. Our findings rationalize extensive prior genetic and biochemical findings and provide a framework for future mechanistic work on telomerase regulation. | |||||||||
History |
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-Structure visualization
Movie |
Movie viewer |
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Structure viewer | EM map: SurfViewMolmilJmol/JSmol |
Supplemental images |
-Downloads & links
-EMDB archive
Map data | emd_14196.map.gz | 78.5 MB | EMDB map data format | |
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Header (meta data) | emd-14196-v30.xml emd-14196.xml | 30 KB 30 KB | Display Display | EMDB header |
FSC (resolution estimation) | emd_14196_fsc.xml | 9.9 KB | Display | FSC data file |
Images | emd_14196.png | 110.7 KB | ||
Masks | emd_14196_msk_1.map | 83.7 MB | Mask map | |
Others | emd_14196_half_map_1.map.gz emd_14196_half_map_2.map.gz | 65.4 MB 65.4 MB | ||
Archive directory | http://ftp.pdbj.org/pub/emdb/structures/EMD-14196 ftp://ftp.pdbj.org/pub/emdb/structures/EMD-14196 | HTTPS FTP |
-Related structure data
Related structure data | 7qxaMC 7qxbC 7qxsC C: citing same article (ref.) M: atomic model generated by this map |
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Similar structure data |
-Links
EMDB pages | EMDB (EBI/PDBe) / EMDataResource |
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Related items in Molecule of the Month |
-Map
File | Download / File: emd_14196.map.gz / Format: CCP4 / Size: 83.7 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Annotation | Post-processed map of DNA-bound human telomerase in complex with TPP1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Projections & slices | Image control
Images are generated by Spider. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 1.09 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
CCP4 map header:
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-Supplemental data
-Mask #1
File | emd_14196_msk_1.map | ||||||||||||
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Projections & Slices |
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Density Histograms |
-Half map: Half-map 2 from auto-refinement in RELION
File | emd_14196_half_map_1.map | ||||||||||||
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Annotation | Half-map 2 from auto-refinement in RELION | ||||||||||||
Projections & Slices |
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Density Histograms |
-Half map: Half-map 1 from auto-refinement in RELION
File | emd_14196_half_map_2.map | ||||||||||||
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Annotation | Half-map 1 from auto-refinement in RELION | ||||||||||||
Projections & Slices |
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Density Histograms |
-Sample components
+Entire : Complex of telomeric DNA-bound human telomerase with TPP1
+Supramolecule #1: Complex of telomeric DNA-bound human telomerase with TPP1
+Supramolecule #2: Telomeric DNA
+Supramolecule #3: Telomerase reverse transcriptase and telomeric RNA
+Supramolecule #4: Histones
+Supramolecule #5: TPP1
+Macromolecule #1: Telomerase reverse transcriptase
+Macromolecule #3: Histone H2A
+Macromolecule #4: Histone H2B
+Macromolecule #6: Adrenocortical dysplasia homolog (Mouse), isoform CRA_a
+Macromolecule #2: human telomerase RNA
+Macromolecule #5: Telomeric DNA
-Experimental details
-Structure determination
Method | cryo EM |
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Processing | single particle reconstruction |
Aggregation state | particle |
-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: 5.0 nm / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Atmosphere: AIR | ||||||||||||||||||||||||
Vitrification | Cryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK IV |
-Electron microscopy
Microscope | FEI TITAN KRIOS |
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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 FIELDBright-field microscopy / Cs: 2.7 mm / Nominal defocus max: 3.0 µm / Nominal defocus min: 1.0 µm / Nominal magnification: 81000 |
Specialist optics | Energy filter - Name: GIF Quantum LS / Energy filter - Slit width: 20 eV |
Sample stage | Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN |
Image recording | Film or detector model: GATAN K3 (6k x 4k) / Digitization - Dimensions - Width: 5760 pixel / Digitization - Dimensions - Height: 4092 pixel / Number grids imaged: 3 / Number real images: 50775 / Average exposure time: 3.0 sec. / Average electron dose: 48.0 e/Å2 Details: Images were collected in movie-mode and fractionated into 48 movie frames |
Experimental equipment | Model: Titan Krios / Image courtesy: FEI Company |