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- EMDB-0391: Structure of bacteriophage T7 leading-strand DNA polymerase (D5A/... -

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Basic information

Entry
Database: EMDB / ID: EMD-0391
TitleStructure of bacteriophage T7 leading-strand DNA polymerase (D5A/E7A)/Trx and of gp4 (E343Q) bound to a DNA fork (Lead1)
Map dataT7 DNA polymerase/Trx interacting with C-terminal tails of two helicase domains (A and E) of T7 helicase (gp4) in complex with a fork DNA substrate and dTTP (from gp4-gp5 leading-strand complex Lead1)
Sample
  • Complex: T7 DNA polymerase/Trx interacting with C-terminal tails of two helicase domains (A and E) of T7 helicase (gp4) in complex with a fork DNA substrate and dTTP (from gp4-gp5 leading-strand complex Lead1)
    • Protein or peptide: gene product 4 helicase-primase
    • Protein or peptide: gene product 5 DNA polymerase
    • Protein or peptide: Thioredoxin 1
    • DNA: Primer
    • DNA: Template
Biological speciesEnterobacteria phage T7 (virus) / Escherichia coli (E. coli)
Methodsingle particle reconstruction / cryo EM / Resolution: 11.2 Å
AuthorsGao Y / Fox T / Val N / Yang W
CitationJournal: Science / Year: 2019
Title: Structures and operating principles of the replisome.
Authors: Yang Gao / Yanxiang Cui / Tara Fox / Shiqiang Lin / Huaibin Wang / Natalia de Val / Z Hong Zhou / Wei Yang /
Abstract: Visualization in atomic detail of the replisome that performs concerted leading- and lagging-DNA strand synthesis at a replication fork has not been reported. Using bacteriophage T7 as a model ...Visualization in atomic detail of the replisome that performs concerted leading- and lagging-DNA strand synthesis at a replication fork has not been reported. Using bacteriophage T7 as a model system, we determined cryo-electron microscopy structures up to 3.2-angstroms resolution of helicase translocating along DNA and of helicase-polymerase-primase complexes engaging in synthesis of both DNA strands. Each domain of the spiral-shaped hexameric helicase translocates sequentially hand-over-hand along a single-stranded DNA coil, akin to the way AAA+ ATPases (adenosine triphosphatases) unfold peptides. Two lagging-strand polymerases are attached to the primase, ready for Okazaki fragment synthesis in tandem. A β hairpin from the leading-strand polymerase separates two parental DNA strands into a T-shaped fork, thus enabling the closely coupled helicase to advance perpendicular to the downstream DNA duplex. These structures reveal the molecular organization and operating principles of a replisome.
History
DepositionDec 5, 2018-
Header (metadata) releaseFeb 20, 2019-
Map releaseMar 6, 2019-
UpdateMar 6, 2019-
Current statusMar 6, 2019Processing site: RCSB / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.02
  • Imaged by UCSF Chimera
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  • Surface view colored by radius
  • Surface level: 0.02
  • Imaged by UCSF Chimera
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_0391.png

Downloads & links

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Map

FileDownload / File: emd_0391.map.gz / Format: CCP4 / Size: 52.7 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationT7 DNA polymerase/Trx interacting with C-terminal tails of two helicase domains (A and E) of T7 helicase (gp4) in complex with a fork DNA substrate and dTTP (from gp4-gp5 leading-strand complex Lead1)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.72 Å/pix.
x 240 pix.
= 412.8 Å		1.72 Å/pix.
x 240 pix.
= 412.8 Å		1.72 Å/pix.
x 240 pix.
= 412.8 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.72 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.02 / Movie #1: 0.02
Minimum - Maximum-0.046995215 - 0.102470495
Average (Standard dev.)0.00032941622 (±0.00424297)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions240240240
Spacing240240240
CellA=B=C: 412.80002 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.721.721.72
M x/y/z240240240
origin x/y/z0.0000.0000.000
length x/y/z412.800412.800412.800
α/β/γ90.00090.00090.000
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS240240240
D min/max/mean-0.0470.1020.000

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Supplemental data

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Sample components

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Entire : T7 DNA polymerase/Trx interacting with C-terminal tails of two he...

EntireName: T7 DNA polymerase/Trx interacting with C-terminal tails of two helicase domains (A and E) of T7 helicase (gp4) in complex with a fork DNA substrate and dTTP (from gp4-gp5 leading-strand complex Lead1)
Components
  • Complex: T7 DNA polymerase/Trx interacting with C-terminal tails of two helicase domains (A and E) of T7 helicase (gp4) in complex with a fork DNA substrate and dTTP (from gp4-gp5 leading-strand complex Lead1)
    • Protein or peptide: gene product 4 helicase-primase
    • Protein or peptide: gene product 5 DNA polymerase
    • Protein or peptide: Thioredoxin 1
    • DNA: Primer
    • DNA: Template

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Supramolecule #1: T7 DNA polymerase/Trx interacting with C-terminal tails of two he...

SupramoleculeName: T7 DNA polymerase/Trx interacting with C-terminal tails of two helicase domains (A and E) of T7 helicase (gp4) in complex with a fork DNA substrate and dTTP (from gp4-gp5 leading-strand complex Lead1)
type: complex / ID: 1 / Parent: 0 / Macromolecule list: all
Source (natural)Organism: Enterobacteria phage T7 (virus)
Recombinant expressionOrganism: Escherichia coli (E. coli)

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Macromolecule #1: gene product 4 helicase-primase

MacromoleculeName: gene product 4 helicase-primase / type: protein_or_peptide / ID: 1 / Enantiomer: LEVO
Source (natural)Organism: Enterobacteria phage T7 (virus)
SequenceString: MDNSHDSDSV FLYHIPCDNC GSSDGNSLFS DGHTFCYVCE KWTAGNEDTK ERASKRKPSG GKPMTYNVW NFGESNGRYS ALTARGISKE TCQKAGYWIA KVDGVMYQVA DYRDQNGNIV S QKVRDKDK NFKTTGSHKS DALFGKHLWN GGKKIVVTEG EIDMLTVMEL ...String:
MDNSHDSDSV FLYHIPCDNC GSSDGNSLFS DGHTFCYVCE KWTAGNEDTK ERASKRKPSG GKPMTYNVW NFGESNGRYS ALTARGISKE TCQKAGYWIA KVDGVMYQVA DYRDQNGNIV S QKVRDKDK NFKTTGSHKS DALFGKHLWN GGKKIVVTEG EIDMLTVMEL QDCKYPVVSL GH GASAAKK TCAANYEYFD QFEQIILMFD MDEAGRKAVE EAAQVLPAGK VRVAVLPCKD ANE CHLNGH DREIMEQVWN AGPWIPDGVV SALSLRERIR EHLSSEESVG LLFSGCTGIN DKTL GARGG EVIMVTSGSG MGKSTFVRQQ ALQWGTAMGK KVGLAMLQES VEETAEDLIG LHNRV RLRQ SDSLKREIIE NGKFDQWFDE LFGNDTFHLY DSFAEAETDR LLAKLAYMRS GLGCDV IIL DHISIVVSAS GESDERKMID NLMTKLKGFA KSTGVVLVVI CHLKNPDKGK AHEEGRP VS ITDLRGSGAL RQLSDTIIAL ERNQQGDMPN LVLVRILKCR FTGDTGIAGY MEYNKETG W LEPSSYSGEE ESHSESTDWS NDTDF

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Macromolecule #2: gene product 5 DNA polymerase

MacromoleculeName: gene product 5 DNA polymerase / type: protein_or_peptide / ID: 2 / Enantiomer: LEVO
Source (natural)Organism: Enterobacteria phage T7 (virus)
SequenceString: MIVSAIAANA LLESVTKFHC GVIYDYSTAE YVSYRPSDFG AYLDALEAEV ARGGLIVFHN GHKYDVPAL TKLAKLQLNR EFHLPRENCI DTLVLSRLIH SNLKDTDMGL LRSGKLPGKR F GSHALEAW GYRLGEMKGE YKDDFKRMLE EQGEEYVDGM EWWNFNEEMM ...String:
MIVSAIAANA LLESVTKFHC GVIYDYSTAE YVSYRPSDFG AYLDALEAEV ARGGLIVFHN GHKYDVPAL TKLAKLQLNR EFHLPRENCI DTLVLSRLIH SNLKDTDMGL LRSGKLPGKR F GSHALEAW GYRLGEMKGE YKDDFKRMLE EQGEEYVDGM EWWNFNEEMM DYNVQDVVVT KA LLEKLLS DKHYFPPEID FTDVGYTTFW SESLEAVDIE HRAAWLLAKQ ERNGFPFDTK AIE ELYVEL AARRSELLRK LTETFGSWYQ PKGGTEMFCH PRTGKPLPKY PRIKTPKVGG IFKK PKNKA QREGREPCEL DTREYVAGAP YTPVEHVVFN PSSRDHIQKK LQEAGWVPTK YTDKG APVV DDEVLEGVRV DDPEKQAAID LIKEYLMIQK RIGQSAEGDK AWLRYVAEDG KIHGSV NPN GAVTGRATHA FPNLAQIPGV RSPYGEQCRA AFGAEHHLDG ITGKPWVQAG IDASGLE LR CLAHFMARFD NGEYAHEILN GDIHTKNQIA AELPTRDNAK TFIYGFLYGA GDEKIGQI V GAGKERGKEL KKKFLENTPA IAALRESIQQ TLVESSQWVA GEQQVKWKRR WIKGLDGRK VHVRSPHAAL NTLLQSAGAL ICKLWIIKTE EMLVEKGLKH GWDGDFAYMA WVHDEIQVGC RTEEIAQVV IETAQEAMRW VGDHWNFRCL LDTEGKMGPN WAICH

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Macromolecule #3: Thioredoxin 1

MacromoleculeName: Thioredoxin 1 / type: protein_or_peptide / ID: 3 / Enantiomer: LEVO
Source (natural)Organism: Escherichia coli (E. coli)
SequenceString:
MSDKIIHLTD DSFDTDVLKA DGAILVDFWA EWCGPCKMIA PILDEIADEY QGKLTVAKLN IDQNPGTAP KYGIRGIPTL LLFKNGEVAA TKVGALSKGQ LKEFLDANLA

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Macromolecule #4: Primer

MacromoleculeName: Primer / type: dna / ID: 4 / Classification: DNA
Source (natural)Organism: Enterobacteria phage T7 (virus)
SequenceString:
(DG)(DG)(DT)(DA)(DC)(DA)(DA)(DC)(DT)(DT) (DG)(DA)(DC)(DG)(DA)(DC)(DA)(DT)(DA)(DG) (DC)(DG)(DT)(DG)(DOA)

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Macromolecule #5: Template

MacromoleculeName: Template / type: dna / ID: 5 / Classification: DNA
Source (natural)Organism: Enterobacteria phage T7 (virus)
SequenceString: (DT)(DT)(DT)(DG)(DG)(DT)(DC)(DA)(DT)(DT) (DT)(DT)(DT)(DT)(DT)(DT)(DT)(DT)(DT)(DT) (DT)(DT)(DT)(DT)(DT)(DT)(DT)(DT)(DA)(DC) (DG)(DG)(DA)(DG)(DT)(DC)(DG)(DT)(DT)(DT) (DC)(DG)(DA)(DC)(DT)(DC)(DC) ...String:
(DT)(DT)(DT)(DG)(DG)(DT)(DC)(DA)(DT)(DT) (DT)(DT)(DT)(DT)(DT)(DT)(DT)(DT)(DT)(DT) (DT)(DT)(DT)(DT)(DT)(DT)(DT)(DT)(DA)(DC) (DG)(DG)(DA)(DG)(DT)(DC)(DG)(DT)(DT)(DT) (DC)(DG)(DA)(DC)(DT)(DC)(DC)(DG)(DT)(DT) (DA)(DT)(DC)(DA)(DC)(DG)(DC)(DT)(DA)(DT) (DG)(DT)(DC)(DG)(DT)(DC)(DA)(DA)(DG)(DT) (DT)(DG)(DT)(DA)(DC)(DC)

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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: 7.5
Component:
ConcentrationNameFormula
50.0 mMTris
150.0 mMpotassium chlorideKCl
3.0 mMDTT
GridDetails: unspecified
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 295 K / Instrument: FEI VITROBOT MARK I

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K2 SUMMIT (4k x 4k) / Detector mode: COUNTING / Average electron dose: 40.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Startup modelType of model: PDB ENTRY
PDB model - PDB ID:

1t8e


Details: 1T8E, 1NUI
Final reconstructionApplied symmetry - Point group: C1 (asymmetric) / Resolution.type: BY AUTHOR / Resolution: 11.2 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION / Number images used: 11746
Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION
FSC plot (resolution estimation)

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Atomic model buiding 1

Initial modelPDB ID:

1t8e

RefinementSpace: REAL / Protocol: FLEXIBLE FIT

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