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- EMDB-45218: Human DNA polymerase theta helicase domain in microhomology annea... -

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Basic information

Entry
Database: EMDB / ID: EMD-45218
TitleHuman DNA polymerase theta helicase domain in microhomology annealed state 2, dimer form
Map data
Sample
  • Complex: Human DNA polymerase theta helicase domain in microhomology annealed state 2, dimer form
    • DNA: DNA (5'-D(P*TP*TP*TP*TP*TP*TP*TP*TP*CP*CP*CP*GP*GP*G)-3')
    • Protein or peptide: DNA polymerase theta
KeywordsDNA repair / helicase / ATPase / TRANSFERASE-DNA complex
Function / homology
Function and homology information


single-stranded DNA endodeoxyribonuclease activity / HDR through MMEJ (alt-NHEJ) / single-stranded DNA helicase activity / double-strand break repair via alternative nonhomologous end joining / replication fork processing / site of DNA damage / 5'-deoxyribose-5-phosphate lyase activity / somatic hypermutation of immunoglobulin genes / negative regulation of double-strand break repair via homologous recombination / error-prone translesion synthesis ...single-stranded DNA endodeoxyribonuclease activity / HDR through MMEJ (alt-NHEJ) / single-stranded DNA helicase activity / double-strand break repair via alternative nonhomologous end joining / replication fork processing / site of DNA damage / 5'-deoxyribose-5-phosphate lyase activity / somatic hypermutation of immunoglobulin genes / negative regulation of double-strand break repair via homologous recombination / error-prone translesion synthesis / DNA helicase activity / base-excision repair / protein homooligomerization / RNA-directed DNA polymerase / RNA-directed DNA polymerase activity / double-strand break repair / site of double-strand break / DNA helicase / damaged DNA binding / DNA-directed DNA polymerase / DNA-directed DNA polymerase activity / DNA repair / DNA damage response / chromatin binding / Golgi apparatus / magnesium ion binding / ATP hydrolysis activity / nucleoplasm / ATP binding / identical protein binding / cytosol
Similarity search - Function
DNA polymerase theta-like, helix-turn-helix domain / : / Helix-turn-helix domain / DNA_pol_Q helicase like region helical domain / DNA polymerase A / DNA polymerase family A / DNA-directed DNA polymerase, family A, conserved site / DNA polymerase family A signature. / DNA-directed DNA polymerase, family A, palm domain / DNA polymerase A domain ...DNA polymerase theta-like, helix-turn-helix domain / : / Helix-turn-helix domain / DNA_pol_Q helicase like region helical domain / DNA polymerase A / DNA polymerase family A / DNA-directed DNA polymerase, family A, conserved site / DNA polymerase family A signature. / DNA-directed DNA polymerase, family A, palm domain / DNA polymerase A domain / DEAD/DEAH box helicase / DEAD/DEAH box helicase domain / Helicase conserved C-terminal domain / helicase superfamily c-terminal domain / Superfamilies 1 and 2 helicase C-terminal domain profile. / Superfamilies 1 and 2 helicase ATP-binding type-1 domain profile. / DEAD-like helicases superfamily / Helicase, C-terminal / Helicase superfamily 1/2, ATP-binding domain / Ribonuclease H superfamily / Ribonuclease H-like superfamily / DNA/RNA polymerase superfamily / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
DNA polymerase theta
Similarity search - Component
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.1 Å
AuthorsIto F / Li Z / Chen XS
Funding support United States, 2 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)R35 GM152198 United States
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)R01 AI150524 United States
CitationJournal: bioRxiv / Year: 2024
Title: Structural Basis for Polθ-Helicase DNA Binding and Microhomology-Mediated End-Joining.
Authors: Fumiaki Ito / Ziyuan Li / Leonid Minakhin / Htet A Khant / Richard T Pomerantz / Xiaojiang S Chen /
Abstract: DNA double-strand breaks (DSBs) present a critical threat to genomic integrity, often precipitating genomic instability and oncogenesis. Repair of DSBs predominantly occurs through homologous ...DNA double-strand breaks (DSBs) present a critical threat to genomic integrity, often precipitating genomic instability and oncogenesis. Repair of DSBs predominantly occurs through homologous recombination (HR) and non-homologous end joining (NHEJ). In HR-deficient cells, DNA polymerase theta (Polθ) becomes critical for DSB repair via microhomology-mediated end joining (MMEJ), also termed theta-mediated end joining (TMEJ). Thus, Polθ is synthetically lethal with BRCA1/2 and other HR factors, underscoring its potential as a therapeutic target in HR-deficient cancers. However, the molecular mechanisms governing Polθ-mediated MMEJ remain poorly understood. Here we present a series of cryo-electron microscopy structures of the Polθ helicase domain (Polθ-hel) in complex with DNA containing 3'-overhang. The structures reveal the sequential conformations adopted by Polθ-hel during the critical phases of DNA binding, microhomology searching, and microhomology annealing. The stepwise conformational changes within the Polθ-hel subdomains and its functional dimeric state are pivotal for aligning the 3'-overhangs, facilitating the microhomology search and subsequent annealing necessary for DSB repair via MMEJ. Our findings illustrate the essential molecular switches within Polθ-hel that orchestrate the MMEJ process in DSB repair, laying the groundwork for the development of targeted therapies against the Polθ-hel.
History
DepositionJun 6, 2024-
Header (metadata) releaseJun 26, 2024-
Map releaseJun 26, 2024-
UpdateJun 26, 2024-
Current statusJun 26, 2024Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_45218.png

Downloads & links

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Map

FileDownload / File: emd_45218.map.gz / Format: CCP4 / Size: 125 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Voxel sizeX=Y=Z: 0.86 Å
Density
Contour LevelBy AUTHOR: 0.086
Minimum - Maximum-0.42985556 - 0.6878929
Average (Standard dev.)0.00024061704 (±0.016985303)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions320320320
Spacing320320320
CellA=B=C: 275.2 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: #1

Fileemd_45218_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_45218_half_map_2.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
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Histogram

Histogram (log scale)

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Sample components

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Entire : Human DNA polymerase theta helicase domain in microhomology annea...

EntireName: Human DNA polymerase theta helicase domain in microhomology annealed state 2, dimer form
Components
  • Complex: Human DNA polymerase theta helicase domain in microhomology annealed state 2, dimer form
    • DNA: DNA (5'-D(P*TP*TP*TP*TP*TP*TP*TP*TP*CP*CP*CP*GP*GP*G)-3')
    • Protein or peptide: DNA polymerase theta

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Supramolecule #1: Human DNA polymerase theta helicase domain in microhomology annea...

SupramoleculeName: Human DNA polymerase theta helicase domain in microhomology annealed state 2, dimer form
type: complex / ID: 1 / Parent: 0 / Macromolecule list: all
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 253 KDa

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Macromolecule #1: DNA (5'-D(P*TP*TP*TP*TP*TP*TP*TP*TP*CP*CP*CP*GP*GP*G)-3')

MacromoleculeName: DNA (5'-D(P*TP*TP*TP*TP*TP*TP*TP*TP*CP*CP*CP*GP*GP*G)-3')
type: dna / ID: 1 / Number of copies: 2 / Classification: DNA
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 4.243748 KDa
SequenceString:
(DT)(DT)(DT)(DT)(DT)(DT)(DT)(DT)(DC)(DC) (DC)(DG)(DG)(DG)

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Macromolecule #2: DNA polymerase theta

MacromoleculeName: DNA polymerase theta / type: protein_or_peptide / ID: 2 / Number of copies: 2 / Enantiomer: LEVO / EC number: DNA helicase
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 92.089797 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: KLLLANWGLP KAVLEKYHSF GVKKMFEWQA ECLLLGQVLE GKNLVYSAPT SAGKTLVAEL LILKRVLEMR KKALFILPFV SVAKEKKYY LQSLFQEVGI KVDGYMGSTS PSRHFSSLDI AVCTIERANG LINRLIEENK MDLLGMVVVD ELHMLGDSHR G YLLELLLT ...String:
KLLLANWGLP KAVLEKYHSF GVKKMFEWQA ECLLLGQVLE GKNLVYSAPT SAGKTLVAEL LILKRVLEMR KKALFILPFV SVAKEKKYY LQSLFQEVGI KVDGYMGSTS PSRHFSSLDI AVCTIERANG LINRLIEENK MDLLGMVVVD ELHMLGDSHR G YLLELLLT KICYITRKSA SCQADLASSL SNAVQIVGMS ATLPNLELVA SWLNAELYHT DFRPVPLLES VKVGNSIYDS SM KLVREFE PMLQVKGDED HVVSLCYETI CDNHSVLLFC PSKKWCEKLA DIIAREFYNL HHQAEGLVKP SECPPVILEQ KEL LEVMDQ LRRLPSGLDS VLQKTVPWGV AFHHAGLTFE ERDIIEGAFR QGLIRVLAAT STLSSGVNLP ARRVIIRTPI FGGR PLDIL TYKQMVGRAG RKGVDTVGES ILICKNSEKS KGIALLQGSL KPVRSCLQRR EGEEVTGSMI RAILEIIVGG VASTS QDMH TYAACTFLAA SMKEGKQGIQ RNQESVQLGA IEACVMWLLE NEFIQSTEAS DGTEGKVYHP THLGSATLSS SLSPAD TLD IFADLQRAMK GFVLENDLHI LYLVTPMFED WTTIDWYRFF CLWEKLPTSM KRVAELVGVE EGFLARCVAA AAAAAAA AQ HRQMAIHKRF FTSLVLLDLI SEVPLREINQ KYGCNRGQIQ SLQQSAAVYA GMITVFSNRL GWHNMELLLS QFQKRLTF G IQRELCDLVR VSLLNAQRAR VLYASGFHTV ADLARANIVE VEVILKNAVP FKSARKAVDE EEEAVEERRN MRTIWVTGR KGLTEREAAA LIVEEARMIL QQDL

UniProtKB: DNA polymerase theta

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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

Concentration1.0 mg/mL
BufferpH: 7.5
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK IV

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Electron microscopy

MicroscopeTFS KRIOS
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Number grids imaged: 1 / Number real images: 10005 / Average exposure time: 3.5 sec. / Average electron dose: 65.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsC2 aperture diameter: 50.0 µm / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 2.0 µm / Nominal defocus min: 0.6 µm / Nominal magnification: 105000
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Particle selectionNumber selected: 3203827
Startup modelType of model: INSILICO MODEL
In silico model: Generated by stochastic gradient descent using ab initio reconstruction in cryoSPARC
Final reconstructionNumber classes used: 1 / Applied symmetry - Point group: C2 (2 fold cyclic) / Resolution.type: BY AUTHOR / Resolution: 3.1 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 78928
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD
FSC plot (resolution estimation)

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