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- EMDB-42980: Human mitochondrial DNA polymerase gamma bound to a replication f... -
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Open data
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Basic information
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Title | Human mitochondrial DNA polymerase gamma bound to a replication fork in an open conformation | ||||||||||||
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![]() | DNA BINDING PROTEIN / DNA polymerase / mitochondrial DNA replication / DNA polymerase gamma / DNA BINDING PROTEIN-DNA complex | ||||||||||||
Function / homology | ![]() gamma DNA polymerase complex / mitochondrial DNA replication / positive regulation of DNA-directed DNA polymerase activity / single-stranded DNA 3'-5' DNA exonuclease activity / Hydrolases; Acting on ester bonds; Exodeoxyribonucleases producing 5'-phosphomonoesters / DNA metabolic process / DNA replication proofreading / DNA polymerase processivity factor activity / mitochondrial nucleoid / Lyases; Carbon-oxygen lyases; Other carbon-oxygen lyases ...gamma DNA polymerase complex / mitochondrial DNA replication / positive regulation of DNA-directed DNA polymerase activity / single-stranded DNA 3'-5' DNA exonuclease activity / Hydrolases; Acting on ester bonds; Exodeoxyribonucleases producing 5'-phosphomonoesters / DNA metabolic process / DNA replication proofreading / DNA polymerase processivity factor activity / mitochondrial nucleoid / Lyases; Carbon-oxygen lyases; Other carbon-oxygen lyases / 5'-deoxyribose-5-phosphate lyase activity / DNA polymerase binding / 3'-5' exonuclease activity / base-excision repair, gap-filling / Transcriptional activation of mitochondrial biogenesis / base-excision repair / DNA-templated DNA replication / double-stranded DNA binding / protease binding / in utero embryonic development / DNA-directed DNA polymerase / DNA-directed DNA polymerase activity / mitochondrial matrix / intracellular membrane-bounded organelle / chromatin binding / protein-containing complex / mitochondrion / DNA binding / identical protein binding / cytoplasm Similarity search - Function | ||||||||||||
Biological species | ![]() | ||||||||||||
Method | single particle reconstruction / cryo EM / Resolution: 4.2 Å | ||||||||||||
![]() | Riccio AA / Krahn JM / Bouvette J / Borgnia MJ / Copeland WC | ||||||||||||
Funding support | ![]()
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![]() | ![]() 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 |
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Structure visualization
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 41.8 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 19.4 KB 19.4 KB | Display Display | ![]() |
FSC (resolution estimation) | ![]() | 10 KB | Display | ![]() |
Images | ![]() | 56.4 KB | ||
Filedesc metadata | ![]() | 7.2 KB | ||
Others | ![]() ![]() | 99.2 MB 99.2 MB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Validation report
Summary document | ![]() | 837.1 KB | Display | ![]() |
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Full document | ![]() | 836.7 KB | Display | |
Data in XML | ![]() | 18.1 KB | Display | |
Data in CIF | ![]() | 23.4 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 8v55MC ![]() 8v54C ![]() 8v5dC ![]() 8v5rC M: atomic model generated by this map C: citing same article ( |
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Similar structure data | Similarity search - Function & homology ![]() |
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Links
EMDB pages | ![]() ![]() |
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Related items in Molecule of the Month |
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Map
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Voxel size | X=Y=Z: 0.9087 Å | ||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||
Details | EMDB XML:
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-Supplemental data
-Half map: #2
File | emd_42980_half_map_1.map | ||||||||||||
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Projections & Slices |
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Density Histograms |
-Half map: #1
File | emd_42980_half_map_2.map | ||||||||||||
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Projections & Slices |
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Density Histograms |
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Sample components
-Entire : human mitochondrial DNA polymerase gamma bound to DNA in an open ...
Entire | Name: human mitochondrial DNA polymerase gamma bound to DNA in an open conformation |
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Components |
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-Supramolecule #1: human mitochondrial DNA polymerase gamma bound to DNA in an open ...
Supramolecule | Name: human mitochondrial DNA polymerase gamma bound to DNA in an open conformation type: complex / ID: 1 / Parent: 0 / Macromolecule list: all |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 220 KDa |
-Macromolecule #1: DNA polymerase subunit gamma-1
Macromolecule | Name: DNA polymerase subunit gamma-1 / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 138.723438 KDa |
Recombinant expression | Organism: ![]() |
Sequence | String: 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 |
-Macromolecule #2: DNA polymerase subunit gamma-2, mitochondrial
Macromolecule | Name: DNA polymerase subunit gamma-2, mitochondrial / type: protein_or_peptide / ID: 2 / Number of copies: 2 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 53.787281 KDa |
Recombinant expression | Organism: ![]() ![]() |
Sequence | String: MASRGSHHHH HHGADAGQPE LLTERSSPKG GHVKSHAELE GNGEHPEAPG SGEGSEALLE ICQRRHFLSG SKQQLSRDSL LSGCHPGFG PLGVELRKNL AAEWWTSVVV FREQVFPVDA LHHKPGPLLP GDSAFRLVSA ETLREILQDK ELSKEQLVAF L ENVLKTSG ...String: MASRGSHHHH HHGADAGQPE LLTERSSPKG GHVKSHAELE GNGEHPEAPG SGEGSEALLE ICQRRHFLSG SKQQLSRDSL LSGCHPGFG PLGVELRKNL AAEWWTSVVV FREQVFPVDA LHHKPGPLLP GDSAFRLVSA ETLREILQDK ELSKEQLVAF L ENVLKTSG KLRENLLHGA LEHYVNCLDL VNKRLPYGLA QIGVCFHPVF DTKQIRNGVK SIGEKTEASL VWFTPPRTSN QW LDFWLRH RLQWWRKFAM SPSNFSSSDC QDEEGRKGNK LYYNFPWGKE LIETLWNLGD HELLHMYPGN VSKLHGRDGR KNV VPCVLS VNGDLDRGML AYLYDSFQLT ENSFTRKKNL HRKVLKLHPC LAPIKVALDV GRGPTLELRQ VCQGLFNELL ENGI SVWPG YLETMQSSLE QLYSKYDEMS ILFTVLVTET TLENGLIHLR SRDTTMKEMM HISKLKDFLI KYISSAKNV UniProtKB: DNA polymerase subunit gamma-2 |
-Macromolecule #3: DNA primer chain
Macromolecule | Name: DNA primer chain / type: dna / ID: 3 / Number of copies: 1 / Classification: DNA |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 7.595886 KDa |
Sequence | String: (DC)(DG)(DC)(DC)(DA)(DG)(DG)(DG)(DT)(DT) (DT)(DT)(DC)(DC)(DC)(DA)(DG)(DT)(DC)(DA) (DC)(DG)(DA)(DC)(DC) |
-Macromolecule #4: DNA template chain
Macromolecule | Name: DNA template chain / type: dna / ID: 4 / Number of copies: 1 / Classification: DNA |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 13.597686 KDa |
Sequence | String: (DG)(DC)(DA)(DC)(DT)(DG)(DG)(DC)(DC)(DG) (DT)(DC)(DG)(DT)(DT)(DT)(DT)(DA)(DC)(DG) (DG)(DT)(DC)(DG)(DT)(DG)(DA)(DC)(DT) (DG)(DG)(DG)(DA)(DA)(DA)(DA)(DC)(DC)(DC) (DT) (DG)(DG)(DC)(DG) |
-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 |
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Grid | Model: UltrAuFoil R1.2/1.3 / Material: GOLD / Support film - Material: GOLD / Pretreatment - Type: GLOW DISCHARGE |
Vitrification | Cryogen name: ETHANE |
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Electron microscopy
Microscope | FEI TALOS ARCTICA |
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Image recording | Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Detector mode: COUNTING / Digitization - Dimensions - Width: 3708 pixel / Digitization - Dimensions - Height: 3838 pixel / Average electron dose: 60.0 e/Å2 |
Electron beam | Acceleration voltage: 200 kV / Electron source: ![]() |
Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: DARK FIELD / Nominal defocus max: 2.5 µm / Nominal defocus min: 1.0 µm |
Experimental equipment | ![]() Model: Talos Arctica / Image courtesy: FEI Company |