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- EMDB-12177: The H/ACA RNP lobe of human telomerase -

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Basic information

Entry
Database: EMDB / ID: EMD-12177
TitleThe H/ACA RNP lobe of human telomerase
Map data
Sample
  • Complex: Human telomerase H/ACA RNP lobe
    • Complex: ribonucleoprotein and telomerase complex
    • Complex: RNA
    • Protein or peptide: Telomerase Cajal body protein 1
    • Protein or peptide: H/ACA ribonucleoprotein complex subunit DKC1
    • Protein or peptide: H/ACA ribonucleoprotein complex subunit 3
    • RNA: RNA (92-MER)
    • Protein or peptide: H/ACA ribonucleoprotein complex subunit 1
    • Protein or peptide: H/ACA ribonucleoprotein complex subunit 2
KeywordsH/ACA RNP / ribonucleoprotein / complex / RNA / RNA BINDING PROTEIN
Function / homology
Function and homology information


telomere formation via telomerase / box H/ACA scaRNP complex / box H/ACA telomerase RNP complex / protein localization to Cajal body / snoRNA guided rRNA pseudouridine synthesis / enzyme-directed rRNA pseudouridine synthesis / rRNA pseudouridine synthesis / box H/ACA snoRNP complex / box H/ACA sno(s)RNA 3'-end processing / pseudouridine synthesis ...telomere formation via telomerase / box H/ACA scaRNP complex / box H/ACA telomerase RNP complex / protein localization to Cajal body / snoRNA guided rRNA pseudouridine synthesis / enzyme-directed rRNA pseudouridine synthesis / rRNA pseudouridine synthesis / box H/ACA snoRNP complex / box H/ACA sno(s)RNA 3'-end processing / pseudouridine synthesis / Isomerases; Intramolecular transferases; Transferring other groups / Cajal body organization / telomerase RNA stabilization / snRNA pseudouridine synthesis / regulation of telomerase RNA localization to Cajal body / mRNA pseudouridine synthesis / box H/ACA snoRNA binding / pseudouridine synthase activity / protein carrier chaperone / telomerase RNA localization to Cajal body / telomerase activity / positive regulation of establishment of protein localization to telomere / scaRNA localization to Cajal body / positive regulation of telomerase RNA localization to Cajal body / RNA folding chaperone / sno(s)RNA-containing ribonucleoprotein complex / telomerase holoenzyme complex / telomerase RNA binding / rRNA modification in the nucleus and cytosol / U3 snoRNA binding / positive regulation of double-strand break repair via nonhomologous end joining / positive regulation of double-strand break repair / telomerase holoenzyme complex assembly / Association of TriC/CCT with target proteins during biosynthesis / Telomere Extension By Telomerase / RNA folding / telomere maintenance via telomerase / RNA processing / Cajal body / positive regulation of double-strand break repair via homologous recombination / positive regulation of telomere maintenance via telomerase / positive regulation of DNA repair / mRNA 3'-UTR binding / fibrillar center / rRNA processing / protein-folding chaperone binding / site of double-strand break / histone binding / chromosome, telomeric region / nuclear body / DNA repair / ubiquitin protein ligase binding / protein-containing complex binding / nucleolus / RNA binding / nucleoplasm / identical protein binding / nucleus / cytoplasm / cytosol
Similarity search - Function
: / H/ACA ribonucleoprotein complex, subunit Gar1/Naf1 / H/ACA RNP complex subunit Gar1/Naf1, Cbf5-binding domain / Gar1/Naf1 RNA binding region / tRNA pseudouridine synthase B family / Dyskerin-like / DKCLD (NUC011) domain / DKCLD (NUC011) domain / H/ACA ribonucleoprotein complex, subunit Nop10 / H/ACA ribonucleoprotein complex, subunit Nop10 superfamily ...: / H/ACA ribonucleoprotein complex, subunit Gar1/Naf1 / H/ACA RNP complex subunit Gar1/Naf1, Cbf5-binding domain / Gar1/Naf1 RNA binding region / tRNA pseudouridine synthase B family / Dyskerin-like / DKCLD (NUC011) domain / DKCLD (NUC011) domain / H/ACA ribonucleoprotein complex, subunit Nop10 / H/ACA ribonucleoprotein complex, subunit Nop10 superfamily / Nucleolar RNA-binding protein, Nop10p family / tRNA pseudouridylate synthase B, C-terminal / tRNA pseudouridylate synthase B C-terminal domain / Pseudouridine synthase II, N-terminal / TruB family pseudouridylate synthase (N terminal domain) / Uncharacterised domain CHP00451 / PUA domain / Pseudouridine synthase, catalytic domain superfamily / Putative RNA-binding Domain in PseudoUridine synthase and Archaeosine transglycosylase / PUA domain / PUA domain superfamily / PUA domain profile. / H/ACA ribonucleoprotein complex, subunit Nhp2-like / PUA-like superfamily / Ribosomal protein L7Ae/L8/Nhp2 family / : / Ribosomal protein L7Ae/L30e/S12e/Gadd45 / Ribosomal protein L7Ae/L30e/S12e/Gadd45 family / 50S ribosomal protein L30e-like / WD domain, G-beta repeat / Translation protein, beta-barrel domain superfamily / Trp-Asp (WD) repeats profile. / Trp-Asp (WD) repeats circular profile. / WD40 repeats / WD40 repeat / WD40-repeat-containing domain superfamily / WD40/YVTN repeat-like-containing domain superfamily
Similarity search - Domain/homology
H/ACA ribonucleoprotein complex subunit DKC1 / Telomerase Cajal body protein 1 / H/ACA ribonucleoprotein complex subunit 3 / H/ACA ribonucleoprotein complex subunit 2 / H/ACA ribonucleoprotein complex subunit 1
Similarity search - Component
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.4 Å
AuthorsNguyen THD / Ghanim GE
Funding support United Kingdom, United States, 2 items
OrganizationGrant numberCountry
Medical Research Council (MRC, United Kingdom)MC_UP_1201/19 United Kingdom
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)GM054198 United States
CitationJournal: Nature / Year: 2021
Title: Structure of human telomerase holoenzyme with bound telomeric DNA.
Authors: George E Ghanim / Adam J Fountain / Anne-Marie M van Roon / Ramya Rangan / Rhiju Das / Kathleen Collins / Thi Hoang Duong Nguyen /
Abstract: Telomerase adds telomeric repeats at chromosome ends to compensate for the telomere loss that is caused by incomplete genome end replication. In humans, telomerase is upregulated during embryogenesis ...Telomerase adds telomeric repeats at chromosome ends to compensate for the telomere loss that is caused by incomplete genome end replication. In humans, telomerase is upregulated during embryogenesis and in cancers, and mutations that compromise the function of telomerase result in disease. A previous structure of human telomerase at a resolution of 8 Å revealed a vertebrate-specific composition and architecture, comprising a catalytic core that is flexibly tethered to an H and ACA (hereafter, H/ACA) box ribonucleoprotein (RNP) lobe by telomerase RNA. High-resolution structural information is necessary to develop treatments that can effectively modulate telomerase activity as a therapeutic approach against cancers and disease. Here we used cryo-electron microscopy to determine the structure of human telomerase holoenzyme bound to telomeric DNA at sub-4 Å resolution, which reveals crucial DNA- and RNA-binding interfaces in the active site of telomerase as well as the locations of mutations that alter telomerase activity. We identified a histone H2A-H2B dimer within the holoenzyme that was bound to an essential telomerase RNA motif, which suggests a role for histones in the folding and function of telomerase RNA. Furthermore, this structure of a eukaryotic H/ACA RNP reveals the molecular recognition of conserved RNA and protein motifs, as well as interactions that are crucial for understanding the molecular pathology of many mutations that cause disease. Our findings provide the structural details of the assembly and active site of human telomerase, which paves the way for the development of therapeutic agents that target this enzyme.
History
DepositionJan 6, 2021-
Header (metadata) releaseApr 28, 2021-
Map releaseApr 28, 2021-
UpdateMay 1, 2024-
Current statusMay 1, 2024Processing site: PDBe / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.025
  • Imaged by UCSF Chimera
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  • Surface view colored by radius
  • Surface level: 0.025
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  • Surface view with fitted model
  • Atomic models: PDB-7bgb
  • Surface level: 0.025
  • Imaged by UCSF Chimera
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  • Simplified surface model + fitted atomic model
  • Atomic modelsPDB-7bgb
  • Imaged by Jmol
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_12177.png

Downloads & links

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Map

FileDownload / File: emd_12177.map.gz / Format: CCP4 / Size: 103 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.11 Å/pix.
x 300 pix.
= 333. Å		1.11 Å/pix.
x 300 pix.
= 333. Å		1.11 Å/pix.
x 300 pix.
= 333. Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.11 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.022 / Movie #1: 0.025
Minimum - Maximum-0.06727189 - 0.14316557
Average (Standard dev.)0.00026469078 (±0.003918603)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions300300300
Spacing300300300
CellA=B=C: 333.0 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.111.111.11
M x/y/z300300300
origin x/y/z0.0000.0000.000
length x/y/z333.000333.000333.000
α/β/γ90.00090.00090.000
start NX/NY/NZ278280246
NX/NY/NZ474891
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS300300300
D min/max/mean-0.0670.1430.000

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Supplemental data

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Half map: #1

Fileemd_12177_half_map_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: #2

Fileemd_12177_half_map_2.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : Human telomerase H/ACA RNP lobe

EntireName: Human telomerase H/ACA RNP lobe
Components
  • Complex: Human telomerase H/ACA RNP lobe
    • Complex: ribonucleoprotein and telomerase complex
    • Complex: RNA
    • Protein or peptide: Telomerase Cajal body protein 1
    • Protein or peptide: H/ACA ribonucleoprotein complex subunit DKC1
    • Protein or peptide: H/ACA ribonucleoprotein complex subunit 3
    • RNA: RNA (92-MER)
    • Protein or peptide: H/ACA ribonucleoprotein complex subunit 1
    • Protein or peptide: H/ACA ribonucleoprotein complex subunit 2

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Supramolecule #1: Human telomerase H/ACA RNP lobe

SupramoleculeName: Human telomerase H/ACA RNP lobe / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#6
Details: The hTR H/ACA motif, which adopts a double-hairpin structure hinged by the H-box and flanked by the ACA box, scaffolds the assembly of two copies each of dyskerin, NHP2, NOP10 and GAR1, one ...Details: The hTR H/ACA motif, which adopts a double-hairpin structure hinged by the H-box and flanked by the ACA box, scaffolds the assembly of two copies each of dyskerin, NHP2, NOP10 and GAR1, one on each hairpin. TCAB1 binds the CAB box.

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Supramolecule #2: ribonucleoprotein and telomerase complex

SupramoleculeName: ribonucleoprotein and telomerase complex / type: complex / ID: 2 / Parent: 1 / Details: 1,2,3,5,6
Source (natural)Organism: Homo sapiens (human)

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Supramolecule #3: RNA

SupramoleculeName: RNA / type: complex / ID: 3 / Parent: 1 / Details: 4
Source (natural)Organism: Homo sapiens (human)

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Macromolecule #1: Telomerase Cajal body protein 1

MacromoleculeName: Telomerase Cajal body protein 1 / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human) / Organ: Kidney
Molecular weightTheoretical: 59.35707 KDa
SequenceString: MKTLETQPLA PDCCPSDQDP APAHPSPHAS PMNKNADSEL MPPPPERGDP PRLSPDPVAG SAVSQELREG DPVSLSTPLE TEFGSPSEL SPRIEEQELS ENTSLPAEEA NGSLSEEEAN GPELGSGKAM EDTSGEPAAE DEGDTAWNYS FSQLPRFLSG S WSEFSTQP ...String:
MKTLETQPLA PDCCPSDQDP APAHPSPHAS PMNKNADSEL MPPPPERGDP PRLSPDPVAG SAVSQELREG DPVSLSTPLE TEFGSPSEL SPRIEEQELS ENTSLPAEEA NGSLSEEEAN GPELGSGKAM EDTSGEPAAE DEGDTAWNYS FSQLPRFLSG S WSEFSTQP ENFLKGCKWA PDGSCILTNS ADNILRIYNL PPELYHEGEQ VEYAEMVPVL RMVEGDTIYD YCWYSLMSSA QP DTSYVAS SSRENPIHIW DAFTGELRAS FRAYNHLDEL TAAHSLCFSP DGSQLFCGFN RTVRVFSTAR PGRDCEVRAT FAK KQGQSG IISCIAFSPA QPLYACGSYG RSLGLYAWDD GSPLALLGGH QGGITHLCFH PDGNRFFSGA RKDAELLCWD LRQS GYPLW SLGREVTTNQ RIYFDLDPTG QFLVSGSTSG AVSVWDTDGP GNDGKPEPVL SFLPQKDCTN GVSLHPSLPL LATAS GQRV FPEPTESGDE GEELGLPLLS TRHVHLECRL QLWWCGGAPD SSIPDDHQGE KGQGGTEGGV GELI

UniProtKB: Telomerase Cajal body protein 1

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Macromolecule #2: H/ACA ribonucleoprotein complex subunit DKC1

MacromoleculeName: H/ACA ribonucleoprotein complex subunit DKC1 / type: protein_or_peptide / ID: 2 / Number of copies: 2 / Enantiomer: LEVO
EC number: Isomerases; Intramolecular transferases; Transferring other groups
Source (natural)Organism: Homo sapiens (human) / Organ: Kidney
Molecular weightTheoretical: 57.779211 KDa
SequenceString: MADAEVIILP KKHKKKKERK SLPEEDVAEI QHAEEFLIKP ESKVAKLDTS QWPLLLKNFD KLNVRTTHYT PLACGSNPLK REIGDYIRT GFINLDKPSN PSSHEVVAWI RRILRVEKTG HSGTLDPKVT GCLIVCIERA TRLVKSQQSA GKEYVGIVRL H NAIEGGTQ ...String:
MADAEVIILP KKHKKKKERK SLPEEDVAEI QHAEEFLIKP ESKVAKLDTS QWPLLLKNFD KLNVRTTHYT PLACGSNPLK REIGDYIRT GFINLDKPSN PSSHEVVAWI RRILRVEKTG HSGTLDPKVT GCLIVCIERA TRLVKSQQSA GKEYVGIVRL H NAIEGGTQ LSRALETLTG ALFQRPPLIA AVKRQLRVRT IYESKMIEYD PERRLGIFWV SCEAGTYIRT LCVHLGLLLG VG GQMQELR RVRSGVMSEK DHMVTMHDVL DAQWLYDNHK DESYLRRVVY PLEKLLTSHK RLVMKDSAVN AICYGAKIML PGV LRYEDG IEVNQEIVVI TTKGEAICMA IALMTTAVIS TCDHGIVAKI KRVIMERDTY PRKWGLGPKA SQKKLMIKQG LLDK HGKPT DSTPATWKQE YVDYSESAKK EVVAEVVKAP QVVAEAAKTA KRKRESESES DETPPAAPQL IKKEKKKSKK DKKAK AGLE SGAEPGDGDS DTTKKKKKKK KAKEVELVSE

UniProtKB: H/ACA ribonucleoprotein complex subunit DKC1

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Macromolecule #3: H/ACA ribonucleoprotein complex subunit 3

MacromoleculeName: H/ACA ribonucleoprotein complex subunit 3 / type: protein_or_peptide / ID: 3 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human) / Organ: Kidney
Molecular weightTheoretical: 7.719989 KDa
SequenceString:
MFLQYYLNEQ GDRVYTLKKF DPMGQQTCSA HPARFSPDDK YSRHRITIKK RFKVLMTQQP RPVL

UniProtKB: H/ACA ribonucleoprotein complex subunit 3

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Macromolecule #5: H/ACA ribonucleoprotein complex subunit 1

MacromoleculeName: H/ACA ribonucleoprotein complex subunit 1 / type: protein_or_peptide / ID: 5 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human) / Organ: Kidney
Molecular weightTheoretical: 22.387963 KDa
SequenceString: MSFRGGGRGG FNRGGGGGGF NRGGSSNHFR GGGGGGGGGN FRGGGRGGFG RGGGRGGFNK GQDQGPPERV VLLGEFLHPC EDDIVCKCT TDENKVPYFN APVYLENKEQ IGKVDEIFGQ LRDFYFSVKL SENMKASSFK KLQKFYIDPY KLLPLQRFLP R PPGEKGPP ...String:
MSFRGGGRGG FNRGGGGGGF NRGGSSNHFR GGGGGGGGGN FRGGGRGGFG RGGGRGGFNK GQDQGPPERV VLLGEFLHPC EDDIVCKCT TDENKVPYFN APVYLENKEQ IGKVDEIFGQ LRDFYFSVKL SENMKASSFK KLQKFYIDPY KLLPLQRFLP R PPGEKGPP RGGGRGGRGG GRGGGGRGGG RGGGFRGGRG GGGGGFRGGR GGGFRGRGH

UniProtKB: H/ACA ribonucleoprotein complex subunit 1

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Macromolecule #6: H/ACA ribonucleoprotein complex subunit 2

MacromoleculeName: H/ACA ribonucleoprotein complex subunit 2 / type: protein_or_peptide / ID: 6 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human) / Organ: Kidney
Molecular weightTheoretical: 17.22607 KDa
SequenceString:
MTKIKADPDG PEAQAEACSG ERTYQELLVN QNPIAQPLAS RRLTRKLYKC IKKAVKQKQI RRGVKEVQKF VNKGEKGIMV LAGDTLPIE VYCHLPVMCE DRNLPYVYIP SKTDLGAAAG SKRPTCVIMV KPHEEYQEAY DECLEEVQSL PLPL

UniProtKB: H/ACA ribonucleoprotein complex subunit 2

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Macromolecule #4: RNA (92-MER)

MacromoleculeName: RNA (92-MER) / type: rna / ID: 4 / Number of copies: 1
Source (natural)Organism: Homo sapiens (human) / Organ: Kidney
Molecular weightTheoretical: 145.477797 KDa
SequenceString: GGGUUGCGGA GGGUGGGCCU GGGAGGGGUG GUGGCCAUUU UUUGUCUAAC CCUAACUGAG AAGGGCGUAG GCGCCGUGCU UUUGCUCCC CGCGCGCUGU UUUUCUCGCU GACUUUCAGC GGGCGGAAAA GCCUCGGCCU GCCGCCUUCC ACCGUUCAUU C UAGAGCAA ...String:
GGGUUGCGGA GGGUGGGCCU GGGAGGGGUG GUGGCCAUUU UUUGUCUAAC CCUAACUGAG AAGGGCGUAG GCGCCGUGCU UUUGCUCCC CGCGCGCUGU UUUUCUCGCU GACUUUCAGC GGGCGGAAAA GCCUCGGCCU GCCGCCUUCC ACCGUUCAUU C UAGAGCAA ACAAAAAAUG UCAGCUGCUG GCCCGUUCGC CCCUCCCGGG GACCUGCGGC GGGUCGCCUG CCCAGCCCCC GA ACCCCGC CUGGAGGCCG CGGUCGGCCC GGGGCUUCUC CGGAGGCACC CACUGCCACC GCGAAGAGUU GGGCUCUGUC AGC CGCGGG UCUCUCGGGG GCGAGGGCGA GGUUCAGGCC UUUCAGGCCG CAGGAAGAGG AACGGAGCGA GUCCCCGCGC GCGG CGCGA UUCCCUGAGC UGUGGGACGU GCACCCAGGA CUCGGCUCAC ACAUGC

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

BufferpH: 8
Component:
ConcentrationFormulaName
20.0 mMC8H18N2O4SHEPES
150.0 mMNaClsodium chloride
2.0 mMMgCl2magnesium chloride
0.05 %(C2H4O)nC14H22OIgepal CA630
1.0 %C12H22O11Trehalose
1.0 mMC4H10O2S2DTT
GridModel: 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
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK IV / Details: Blot for 4-5 seconds before plunging.

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Electron microscopy

MicroscopeFEI TITAN KRIOS
TemperatureMin: 78.0 K
Specialist opticsEnergy filter - Name: GIF Quantum LS / Energy filter - Slit width: 20 eV
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Digitization - Dimensions - Width: 5760 pixel / Digitization - Dimensions - Height: 4092 pixel / Number grids imaged: 2 / Number real images: 43639 / Average exposure time: 1.0 sec. / Average electron dose: 47.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsC2 aperture diameter: 70.0 µm / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 3.5 µm / Nominal defocus min: 1.2 µm / Nominal magnification: 81000
Sample stageSpecimen 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

DetailsAll images were processed using RELION 3.1.
Particle selectionNumber selected: 15760434
Startup modelType of model: EMDB MAP
EMDB ID:

7521

Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.4 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 204665
Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION (ver. 3.1)
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION (ver. 3.1)
Final 3D classificationSoftware - Name: RELION (ver. 3.1)
FSC plot (resolution estimation)

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Atomic model buiding 1

RefinementSpace: RECIPROCAL / Protocol: AB INITIO MODEL / Overall B value: 104
Output model

PDB-7bgb:
The H/ACA RNP lobe of human telomerase

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