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- EMDB-42982: Human mitochondrial DNA polymerase catalytic subunit, PolG, in an... -

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Basic information

Entry
Database: EMDB / ID: EMD-42982
TitleHuman mitochondrial DNA polymerase catalytic subunit, PolG, in an APO conformation
Map data
Sample
  • Complex: mitochondrial DNA polymerase catalytic subunit, PolG
    • Protein or peptide: DNA polymerase subunit gamma-1
KeywordsDNA BINDING PROTEIN / DNA polymerase / mitochondrial DNA replication / DNA polymerase catalytic subunit / DNA BINDING PROTEIN-DNA complex
Function / homology
Function and homology information


gamma DNA polymerase complex / mitochondrial DNA replication / single-stranded DNA 3'-5' DNA exonuclease activity / Hydrolases; Acting on ester bonds; Exodeoxyribonucleases producing 5'-phosphomonoesters / DNA replication proofreading / DNA metabolic process / mitochondrial nucleoid / Lyases; Carbon-oxygen lyases; Other carbon-oxygen lyases / 5'-deoxyribose-5-phosphate lyase activity / 3'-5' exonuclease activity ...gamma DNA polymerase complex / mitochondrial DNA replication / single-stranded DNA 3'-5' DNA exonuclease activity / Hydrolases; Acting on ester bonds; Exodeoxyribonucleases producing 5'-phosphomonoesters / DNA replication proofreading / DNA metabolic process / mitochondrial nucleoid / Lyases; Carbon-oxygen lyases; Other carbon-oxygen lyases / 5'-deoxyribose-5-phosphate lyase activity / 3'-5' exonuclease activity / base-excision repair, gap-filling / base-excision repair / DNA-templated DNA replication / protease binding / DNA-directed DNA polymerase / DNA-directed DNA polymerase activity / mitochondrial matrix / intracellular membrane-bounded organelle / chromatin binding / protein-containing complex / mitochondrion / DNA binding
Similarity search - Function
DNA-directed DNA-polymerase, family A, mitochondria / DNA mitochondrial polymerase, exonuclease domain / : / DNA mitochondrial polymerase exonuclease domain / 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 / Ribonuclease H-like superfamily / DNA/RNA polymerase superfamily
Similarity search - Domain/homology
DNA polymerase subunit gamma-1
Similarity search - Component
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.0 Å
AuthorsRiccio AA / Brannon AJ / Krahn JM / Bouvette J / Borgnia JM / Copeland WC
Funding support United States, 3 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of Environmental Health Sciences (NIH/NIEHS)Z01 ES065078 United States
National Institutes of Health/National Institute of Environmental Health Sciences (NIH/NIEHS)Z01 ES065080 United States
National Institutes of Health/National Institute of Environmental Health Sciences (NIH/NIEHS)ZIC ES 103326 United States
CitationJournal: Nucleic Acids Res / Year: 2024
Title: Coordinated DNA polymerization by Polγ and the region of LonP1 regulated proteolysis.
Authors: Amanda A Riccio / Asia J Brannon / Juno M Krahn / Jonathan Bouvette / Jason G Williams / Mario J Borgnia / William C Copeland /
Abstract: The replicative mitochondrial DNA polymerase, Polγ, and its protein regulation are essential for the integrity of the mitochondrial genome. The intricacies of Polγ regulation and its interactions ...The replicative mitochondrial DNA polymerase, Polγ, and its protein regulation are essential for the integrity of the mitochondrial genome. The intricacies of Polγ regulation and its interactions with regulatory proteins, which are essential for fine-tuning polymerase function, remain poorly understood. Misregulation of the Polγ heterotrimer, consisting of (i) PolG, the polymerase catalytic subunit and (ii) PolG2, the accessory subunit, ultimately results in mitochondrial diseases. Here, we used single particle cryo-electron microscopy to resolve the structure of PolG in its apoprotein state and we captured Polγ at three intermediates within the catalytic cycle: DNA bound, engaged, and an active polymerization state. Chemical crosslinking mass spectrometry, and site-directed mutagenesis uncovered the region of LonP1 engagement of PolG, which promoted proteolysis and regulation of PolG protein levels. PolG2 clinical variants, which disrupted a stable Polγ complex, led to enhanced LonP1-mediated PolG degradation. Overall, this insight into Polγ aids in an understanding of mitochondrial DNA replication and characterizes how machinery of the replication fork may be targeted for proteolytic degradation when improperly functioning.
History
DepositionNov 30, 2023-
Header (metadata) releaseJul 10, 2024-
Map releaseJul 10, 2024-
UpdateJul 10, 2024-
Current statusJul 10, 2024Processing site: RCSB / Status: Released

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Structure visualization

Downloads & links

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Map

FileDownload / File: emd_42982.map.gz / Format: CCP4 / Size: 107.2 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Voxel sizeX=Y=Z: 0.833 Å
Density
Contour LevelBy AUTHOR: 3.8
Minimum - Maximum-38.831882 - 58.970973999999998
Average (Standard dev.)0.000000000005114 (±1.0)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderZYX
Origin000
Dimensions304304304
Spacing304304304
CellA=B=C: 253.232 Å
α=β=γ: 90.0 °

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Supplemental data

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Sample components

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Entire : mitochondrial DNA polymerase catalytic subunit, PolG

EntireName: mitochondrial DNA polymerase catalytic subunit, PolG
Components
  • Complex: mitochondrial DNA polymerase catalytic subunit, PolG
    • Protein or peptide: DNA polymerase subunit gamma-1

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Supramolecule #1: mitochondrial DNA polymerase catalytic subunit, PolG

SupramoleculeName: mitochondrial DNA polymerase catalytic subunit, PolG / type: complex / ID: 1 / Parent: 0 / Macromolecule list: all
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 120 KDa

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Macromolecule #1: DNA polymerase subunit gamma-1

MacromoleculeName: DNA polymerase subunit gamma-1 / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 138.723438 KDa
Recombinant expressionOrganism: unidentified baculovirus
SequenceString: MGGSHHHHHH GSRFMVSSSV PASDPSDGQR RRQQQQQQQQ QQQQQPQQPQ VLSSEGGQLR HNPLDIQMLS RGLHEQIFGQ GGEMPGEAA VRRSVEHLQK HGLWGQPAVP LPDVELRLPP LYGDNLDQHF RLLAQKQSLP YLEAANLLLQ AQLPPKPPAW A WAEGWTRY ...String:
MGGSHHHHHH GSRFMVSSSV PASDPSDGQR RRQQQQQQQQ QQQQQPQQPQ VLSSEGGQLR HNPLDIQMLS RGLHEQIFGQ GGEMPGEAA VRRSVEHLQK HGLWGQPAVP LPDVELRLPP LYGDNLDQHF RLLAQKQSLP YLEAANLLLQ AQLPPKPPAW A WAEGWTRY GPEGEAVPVA IPEERALVFA VAVCLAEGTC PTLAVAISPS AWYSWCSQRL VEERYSWTSQ LSPADLIPLE VP TGASSPT QRDWQEQLVV GHNVSFDRAH IREQYLIQGS RMRFLDTMSM HMAISGLSSF QRSLWIAAKQ GKHKVQPPTK QGQ KSQRKA RRGPAISSWD WLDISSVNSL AEVHRLYVGG PPLEKEPREL FVKGTMKDIR ENFQDLMQYC AQDVWATHEV FQQQ LPLFL ERCPHPVTLA GMLEMGVSYL PVNQNWERYL AEAQGTYEEL QREMKKSLMD LANDACQLLS GERYKEDPWL WDLEW DLQE FKQKKAKKVK KEPATASKLP IEGAGAPGDP MDQEDLGPCS EEEEFQQDVM ARACLQKLKG TTELLPKRPQ HLPGHP GWY RKLCPRLDDP AWTPGPSLLS LQMRVTPKLM ALTWDGFPLH YSERHGWGYL VPGRRDNLAK LPTGTTLESA GVVCPYR AI ESLYRKHCLE QGKQQLMPQE AGLAEEFLLT DNSAIWQTVE ELDYLEVEAE AKMENLRAAV PGQPLALTAR GGPKDTQP S YHHGNGPYND VDIPGCWFFK LPHKDGNSCN VGSPFAKDFL PKMEDGTLQA GPGGASGPRA LEINKMISFW RNAHKRISS QMVVWLPRSA LPRAVIRHPD YDEEGLYGAI LPQVVTAGTI TRRAVEPTWL TASNARPDRV GSELKAMVQA PPGYTLVGAD VDSQELWIA AVLGDAHFAG MHGCTAFGWM TLQGRKSRGT DLHSKTATTV GISREHAKIF NYGRIYGAGQ PFAERLLMQF N HRLTQQEA AEKAQQMYAA TKGLRWYRLS DEGEWLVREL NLPVDRTEGG WISLQDLRKV QRETARKSQW KKWEVVAERA WK GGTESEM FNKLESIATS DIPRTPVLGC CISRALEPSA VQEEFMTSRV NWVVQSSAVD YLHLMLVAMK WLFEEFAIDG RFC ISIHDE VRYLVREEDR YRAALALQIT NLLTRCMFAY KLGLNDLPQS VAFFSAVDID RCLRKEVTMD CKTPSNPTGM ERRY GIPQG EALDIYQIIE LTKGSLEKRS QPGP

UniProtKB: DNA polymerase subunit gamma-1

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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

Concentration1.2 mg/mL
BufferpH: 8
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeTFS KRIOS
Image recordingFilm or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Average electron dose: 60.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.5 µm / Nominal defocus min: 1.0 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Startup modelType of model: OTHER
Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.0 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 122659
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD

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