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- EMDB-42033: RNA priming complex of Human Polymerase-Alpha-Primase (Conformation 1) -
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Open data
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Basic information
Entry | ![]() | ||||||||||||
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Title | RNA priming complex of Human Polymerase-Alpha-Primase (Conformation 1) | ||||||||||||
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![]() | Polymerase / Primase / Polymerase Alpha / REPLICATION | ||||||||||||
Function / homology | ![]() positive regulation of DNA primase activity / DNA primase AEP / ribonucleotide binding / DNA replication initiation / DNA/RNA hybrid binding / Telomere C-strand synthesis initiation / Inhibition of replication initiation of damaged DNA by RB1/E2F1 / alpha DNA polymerase:primase complex / regulation of type I interferon production / Polymerase switching ...positive regulation of DNA primase activity / DNA primase AEP / ribonucleotide binding / DNA replication initiation / DNA/RNA hybrid binding / Telomere C-strand synthesis initiation / Inhibition of replication initiation of damaged DNA by RB1/E2F1 / alpha DNA polymerase:primase complex / regulation of type I interferon production / Polymerase switching / Processive synthesis on the lagging strand / DNA primase activity / Removal of the Flap Intermediate / Polymerase switching on the C-strand of the telomere / primosome complex / lagging strand elongation / DNA replication, synthesis of primer / mitotic DNA replication initiation / DNA strand elongation involved in DNA replication / DNA synthesis involved in DNA repair / G1/S-Specific Transcription / leading strand elongation / DNA replication origin binding / Activation of the pre-replicative complex / DNA replication initiation / Defective pyroptosis / nuclear matrix / double-strand break repair via nonhomologous end joining / protein import into nucleus / nuclear envelope / single-stranded DNA binding / 4 iron, 4 sulfur cluster binding / DNA replication / DNA-directed DNA polymerase / DNA-directed DNA polymerase activity / DNA repair / nucleotide binding / chromatin binding / chromatin / nucleolus / protein kinase binding / magnesium ion binding / DNA binding / zinc ion binding / nucleoplasm / membrane / nucleus / metal ion binding / cytosol Similarity search - Function | ||||||||||||
Biological species | ![]() | ||||||||||||
Method | single particle reconstruction / negative staining / Resolution: 11.88 Å | ||||||||||||
![]() | Cordoba JJ / Chazin WJ | ||||||||||||
Funding support | ![]()
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![]() | ![]() Title: Flexibility and Distributive Synthesis Regulate RNA Priming and Handoff in Human DNA Polymerase α-Primase. Authors: John J Cordoba / Elwood A Mullins / Lauren E Salay / Brandt F Eichman / Walter J Chazin / ![]() Abstract: DNA replication in eukaryotes relies on the synthesis of a ∼30-nucleotide RNA/DNA primer strand through the dual action of the heterotetrameric polymerase α-primase (pol-prim) enzyme. Synthesis of ...DNA replication in eukaryotes relies on the synthesis of a ∼30-nucleotide RNA/DNA primer strand through the dual action of the heterotetrameric polymerase α-primase (pol-prim) enzyme. Synthesis of the 7-10-nucleotide RNA primer is regulated by the C-terminal domain of the primase regulatory subunit (PRIM2C) and is followed by intramolecular handoff of the primer to pol α for extension by ∼20 nucleotides of DNA. Here, we provide evidence that RNA primer synthesis is governed by a combination of the high affinity and flexible linkage of the PRIM2C domain and the surprisingly low affinity of the primase catalytic domain (PRIM1) for substrate. Using a combination of small angle X-ray scattering and electron microscopy, we found significant variability in the organization of PRIM2C and PRIM1 in the absence and presence of substrate, and that the population of structures with both PRIM2C and PRIM1 in a configuration aligned for synthesis is low. Crosslinking was used to visualize the orientation of PRIM2C and PRIM1 when engaged by substrate as observed by electron microscopy. Microscale thermophoresis was used to measure substrate affinities for a series of pol-prim constructs, which showed that the PRIM1 catalytic domain does not bind the template or emergent RNA-primed templates with appreciable affinity. Together, these findings support a model of RNA primer synthesis in which generation of the nascent RNA strand and handoff of the RNA-primed template from primase to polymerase α is mediated by the high degree of inter-domain flexibility of pol-prim, the ready dissociation of PRIM1 from its substrate, and the much higher affinity of the POLA1cat domain of polymerase α for full-length RNA-primed templates. | ||||||||||||
History |
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Structure visualization
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 31.2 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 21.5 KB 21.5 KB | Display Display | ![]() |
FSC (resolution estimation) | ![]() | 8.5 KB | Display | ![]() |
Images | ![]() | 18.5 KB | ||
Filedesc metadata | ![]() | 6.4 KB | ||
Others | ![]() ![]() | 59.4 MB 59.4 MB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | 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: 1.79015 Å | ||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||
Details | EMDB XML:
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-Supplemental data
-Half map: #1
File | emd_42033_half_map_1.map | ||||||||||||
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Projections & Slices |
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Density Histograms |
-Half map: #2
File | emd_42033_half_map_2.map | ||||||||||||
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Projections & Slices |
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Density Histograms |
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Sample components
-Entire : Ternary complex of polymerase alpha-primase bound to an RNA prime...
Entire | Name: Ternary complex of polymerase alpha-primase bound to an RNA primed-template substrate. |
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Components |
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-Supramolecule #1: Ternary complex of polymerase alpha-primase bound to an RNA prime...
Supramolecule | Name: Ternary complex of polymerase alpha-primase bound to an RNA primed-template substrate. type: complex / ID: 1 / Parent: 0 / Macromolecule list: all / Details: Complex stabilized by BS3 crosslinking. |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 200 KDa |
-Macromolecule #1: DNA polymerase alpha subunit B
Macromolecule | Name: DNA polymerase alpha subunit B / type: protein_or_peptide / ID: 1 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() |
Recombinant expression | Organism: ![]() ![]() |
Sequence | String: GSATPSQKYN SRSNRGEVVT SFGLAQGV S WSGRGGAGNI SLKVLGCPEA LTGSYKSMFQ KLPDIREVLT CKIEELGSEL KEHYKIEAF TPLLAPAQEP VTLLGQIGCD SNGKLNNKSV ILEGDREHSS GAQIPVDLSE LKEYSLFPGQ VVIMEGINT TGRKLVATKL ...String: GSATPSQKYN SRSNRGEVVT SFGLAQGV S WSGRGGAGNI SLKVLGCPEA LTGSYKSMFQ KLPDIREVLT CKIEELGSEL KEHYKIEAF TPLLAPAQEP VTLLGQIGCD SNGKLNNKSV ILEGDREHSS GAQIPVDLSE LKEYSLFPGQ VVIMEGINT TGRKLVATKL YEGVPLPFYQ PTEEDADFEQ SMVLVACGPY TTSDSITYDP L LDLIAVIN HDRPDVCILF GPFLDAKHEQ VENCLLTSPF EDIFKQCLRT IIEGTRSSGS HL VFVPSLR DVHHEPVYPQ PPFSYSDLSR EDKKQVQFVS EPCSLSINGV IFGLTSTDLL FHL GAEEIS SSSGTSDRFS RILKHILTQR SYYPLYPPQE DMAIDYESFY VYAQLPVTPD VLII PSELR YFVKDVLGCV CVNPGRLTKG QVGGTFARLY LRRPAADGAE RQSPCIAVQV VRI UniProtKB: DNA polymerase alpha subunit B |
-Macromolecule #2: DNA polymerase alpha catalytic subunit
Macromolecule | Name: DNA polymerase alpha catalytic subunit / type: protein_or_peptide / ID: 2 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() |
Recombinant expression | Organism: ![]() ![]() |
Sequence | String: MAQLTDEEKY RDCERFKCPC PTCGTENIYD NVFDGSGTDM EPSLYRCSNI DCKASPL TF TVQLSNKLIM DIRRFIKKYY DGWLICEEPT CRNRTRHLPL QFSRTGPLCP ACMKATLQ P EYSDKSLYTQ LCFYRYIFDA ECALEKLTTD HEKDKLKKQF FTPKVLQDYR ...String: MAQLTDEEKY RDCERFKCPC PTCGTENIYD NVFDGSGTDM EPSLYRCSNI DCKASPL TF TVQLSNKLIM DIRRFIKKYY DGWLICEEPT CRNRTRHLPL QFSRTGPLCP ACMKATLQ P EYSDKSLYTQ LCFYRYIFDA ECALEKLTTD HEKDKLKKQF FTPKVLQDYR KLKNTAEQF LSRSGYSEVN LSKLFAGCAV KS UniProtKB: DNA polymerase alpha catalytic subunit |
-Macromolecule #3: DNA primase large subunit
Macromolecule | Name: DNA primase large subunit / type: protein_or_peptide / ID: 3 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() |
Recombinant expression | Organism: ![]() ![]() |
Sequence | String: MEFSGRKWRK LRLAGDQRNA SYPHCLQFYL QPPSENISLI EFENLAIDRV KLLKSVENLG VSYVKGTEQ YQSKLESELR KLKFSYRENL EDEYEPRRRD HISHFILRLA YCQSEELRRW F IQQEMDLL RFRFSILPKD KIQDFLKDSQ LQFEAISDEE KTLREQEIVA ...String: MEFSGRKWRK LRLAGDQRNA SYPHCLQFYL QPPSENISLI EFENLAIDRV KLLKSVENLG VSYVKGTEQ YQSKLESELR KLKFSYRENL EDEYEPRRRD HISHFILRLA YCQSEELRRW F IQQEMDLL RFRFSILPKD KIQDFLKDSQ LQFEAISDEE KTLREQEIVA SSPSLSGLKL GF ESIYKIP FADALDLFRG RKVYLEDGFA YVPLKDIVAI ILNEFRAKLS KALALTARSL PAV QSDERL QPLLNHLSHS YTGQDYSTQG NVGKISLDQI DLLSTKSFPP CMRQLHKALR ENHH LRHGG RMQYGLFLKG IGLTLEQALQ FWKQEFIKGK MDPDKFDKGY SYNIRHSFGK EGKRT DYTP FSCLKIILSN PPSQGDYHGC PFRHSDPELL KQKLQSYKIS PGGISQILDL VKGTHY QVA CQKYFEMIHN VDDCGFSLNH PNQFFCESQR ILNGGKDIKK EPIQPETPQP KPSVQKT KD ASSALASLNS SLEMDMEGLE DYFSEDS UniProtKB: DNA primase large subunit |
-Macromolecule #4: DNA primase small subunit
Macromolecule | Name: DNA primase small subunit / type: protein_or_peptide / ID: 4 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() |
Recombinant expression | Organism: ![]() ![]() |
Sequence | String: GSMETFDPTE LPELLKLYYR RLFPYSQYYR WLNYGGVIKN YFQHREFSFT LKDDIYIRYQ SF NNQSDLE KEMQKMNPYK IDIGAVYSHR PNQHNTVKLG AFQAQEKELV FDIDMTDYDD VRR CCSSAD ICPKCWTLMT MAIRIIDRAL KEDFGFKHRL WVYSGRRGVH ...String: GSMETFDPTE LPELLKLYYR RLFPYSQYYR WLNYGGVIKN YFQHREFSFT LKDDIYIRYQ SF NNQSDLE KEMQKMNPYK IDIGAVYSHR PNQHNTVKLG AFQAQEKELV FDIDMTDYDD VRR CCSSAD ICPKCWTLMT MAIRIIDRAL KEDFGFKHRL WVYSGRRGVH CWVCDESVRK LSSA VRSGI VEYLSLVKGG QDVKKKVHLS EKIHPFIRKS INIIKKYFEE YALVNQDILE NKESW DKIL ALVPETIHDE LQQSFQKSHN SLQRWEHLKK VASRYQNNIK NDKYGPWLEW EIMLQY CFP RLDINVSKGI NHLLKSPFSV HPKTGRISVP IDLQKVDQFD PFTVPTISFI CRELDAI ST NEEEKEENEA ESDVKHRTRD YKKTSLAPYV KVFEHFLENL DKSRKGELLK KSDLQKDF UniProtKB: DNA primase small subunit |
-Macromolecule #5: RNA priming substrate - primer
Macromolecule | Name: RNA priming substrate - primer / type: rna / ID: 5 / Details: 5' triphosphorylated |
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Source (natural) | Organism: ![]() |
Sequence | String: GGAUACUG |
-Macromolecule #6: RNA priming substrate - template
Macromolecule | Name: RNA priming substrate - template / type: dna / ID: 6 / Classification: DNA |
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Source (natural) | Organism: ![]() |
Sequence | String: GTATGTATGT CAGTATCCTG TATGTATGA |
-Experimental details
-Structure determination
Method | negative staining |
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![]() | single particle reconstruction |
Aggregation state | particle |
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Sample preparation
Concentration | 0.009 mg/mL | |||||||||||||||
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Buffer | pH: 7.5 Component:
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Staining | Type: NEGATIVE / Material: Uranyl Formate Details: 2.5 uL sample was applied to grid for 1 minute, then blotted with filter paper, washed for 5 seconds with DI water, blotted, washed for 5 seconds in stain, blotted, then stained for 90 seconds. | |||||||||||||||
Grid | Model: Quantifoil / Material: COPPER / Mesh: 400 / Support film - Material: CARBON / Support film - topology: CONTINUOUS / Support film - Film thickness: 5 / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 180 sec. |
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Electron microscopy
Microscope | FEI TECNAI 20 |
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Image recording | Film or detector model: GATAN ULTRASCAN 4000 (4k x 4k) / Digitization - Dimensions - Width: 4096 pixel / Digitization - Dimensions - Height: 4096 pixel / Number grids imaged: 1 / Number real images: 1083 / Average electron dose: 20.0 e/Å2 |
Electron beam | Acceleration voltage: 200 kV / Electron source: ![]() |
Electron optics | Illumination mode: SPOT SCAN / Imaging mode: BRIGHT FIELD / Cs: 1.2 mm / Nominal defocus max: 1.5 µm / Nominal defocus min: 1.5 µm |