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- EMDB-39391: structure of phage T6 topoisomerase II central domain bound with DNA -

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Basic information

Entry
Database: EMDB / ID: EMD-39391
Titlestructure of phage T6 topoisomerase II central domain bound with DNA
Map datamap
Sample
  • Complex: Phage T6 topoisomerase II central domian bound with G-segment DNA
    • Protein or peptide: DNA topoisomerase medium subunit
    • Protein or peptide: DNA topoisomerase (ATP-hydrolyzing)
    • DNA: DNA(5'-D(P*TP*GP*TP*GP*TP*GP*TP*AP*TP*AP*TP*AP*TP*AP*CP*AP*CP*AP*TP*AP*TP*AP))
    • DNA: DNA (5'-D(P*TP*AP*TP*AP*TP*GP*TP*GP*TP*AP*TP*AP*TP*AP*TP*AP*CP*AP*CP*AP*CP*A)-3')
  • Ligand: MAGNESIUM ION
Keywordstopoisomerase II / ISOMERASE
Function / homology
Function and homology information


sister chromatid segregation / DNA topoisomerase type II (double strand cut, ATP-hydrolyzing) activity / DNA topoisomerase (ATP-hydrolysing) / DNA topological change / protein-containing complex / DNA binding / ATP binding
Similarity search - Function
DNA topoisomerase II, eukaryotic-type / : / Topoisomerase (Topo) IIA-type catalytic domain profile. / DNA topoisomerase, type IIA, alpha-helical domain superfamily / DNA topoisomerase, type IIA, domain A / DNA topoisomerase, type IIA, domain A, alpha-beta / DNA gyrase/topoisomerase IV, subunit A / DNA Topoisomerase IV / DNA topoisomerase, type IIA, subunit B, domain 2 / DNA gyrase B ...DNA topoisomerase II, eukaryotic-type / : / Topoisomerase (Topo) IIA-type catalytic domain profile. / DNA topoisomerase, type IIA, alpha-helical domain superfamily / DNA topoisomerase, type IIA, domain A / DNA topoisomerase, type IIA, domain A, alpha-beta / DNA gyrase/topoisomerase IV, subunit A / DNA Topoisomerase IV / DNA topoisomerase, type IIA, subunit B, domain 2 / DNA gyrase B / DNA topoisomerase, type IIA / DNA topoisomerase, type IIA, conserved site / DNA topoisomerase II signature. / TopoisomeraseII / DNA topoisomerase, type IIA, subunit B, C-terminal / DNA topoisomerase, type IIA-like domain superfamily / Histidine kinase-, DNA gyrase B-, and HSP90-like ATPase / Histidine kinase-like ATPases / Histidine kinase/HSP90-like ATPase superfamily / Ribosomal protein S5 domain 2-type fold, subgroup / Ribosomal protein S5 domain 2-type fold
Similarity search - Domain/homology
DNA topoisomerase (ATP-hydrolyzing) / DNA topoisomerase medium subunit
Similarity search - Component
Biological speciesEnterobacteria phage T6 (virus) / Escherichia phage T4 (virus) / Salmonella phage Chi (virus) / DNA molecule (others)
Methodsingle particle reconstruction / cryo EM / Resolution: 2.8 Å
AuthorsChen YT / Xin YH
Funding support China, 1 items
OrganizationGrant numberCountry
Chinese Academy of Sciences China
CitationJournal: Nat Commun / Year: 2024
Title: Structural and functional insights into the T-even type bacteriophage topoisomerase II.
Authors: Yuhui Xin / Runqi Xian / Yunge Yang / Jingyuan Cong / Zihe Rao / Xuemei Li / Yutao Chen /
Abstract: T-even type bacteriophages are virulent phages commonly used as model organisms, playing a crucial role in understanding various biological processes. One such process involves the regulation of DNA ...T-even type bacteriophages are virulent phages commonly used as model organisms, playing a crucial role in understanding various biological processes. One such process involves the regulation of DNA topology during phage replication upon host infection, governed by type IIA DNA topoisomerases. In spite of various studies on prokaryotic and eukaryotic counterparts, viral topoisomerase II remains insufficiently understood, especially the unique domain composition of T4 phage. In this study, we determine the cryo-EM structures of topoisomerase II from T4 and T6 phages, including full-length structures of both apo and DNA-binding states which have never been determined before. Together with other conformational states, these structures provide an explicit blueprint of mechanisms of phage topoisomerase II. Particularly, the asymmetric dimeric interactions observed in cryo-EM structures of T6 phage topoisomerase II ATPase domain and central domain bound with DNA shed light on the asynchronous ATP usage and asynchronous cleavage of the G-segment DNA, respectively. The elucidation of phage topoisomerase II's structures and functions not only enhances our understanding of mechanisms and evolutionary parallels with prokaryotic and eukaryotic homologs but also highlights its potential as a model for developing type IIA topoisomerase inhibitors.
History
DepositionMar 6, 2024-
Header (metadata) releaseSep 25, 2024-
Map releaseSep 25, 2024-
UpdateOct 8, 2025-
Current statusOct 8, 2025Processing site: PDBj / Status: Released

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Structure visualization

Downloads & links

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Map

FileDownload / File: emd_39391.map.gz / Format: CCP4 / Size: 52.7 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Annotationmap
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.04 Å/pix.
x 240 pix.
= 249.6 Å		1.04 Å/pix.
x 240 pix.
= 249.6 Å		1.04 Å/pix.
x 240 pix.
= 249.6 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.04 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.8
Minimum - Maximum-4.2631545 - 6.9169436
Average (Standard dev.)0.0007772004 (±0.18616942)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions240240240
Spacing240240240
CellA=B=C: 249.59999 Å
α=β=γ: 90.0 °

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Supplemental data

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Sample components

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Entire : Phage T6 topoisomerase II central domian bound with G-segment DNA

EntireName: Phage T6 topoisomerase II central domian bound with G-segment DNA
Components
  • Complex: Phage T6 topoisomerase II central domian bound with G-segment DNA
    • Protein or peptide: DNA topoisomerase medium subunit
    • Protein or peptide: DNA topoisomerase (ATP-hydrolyzing)
    • DNA: DNA(5'-D(P*TP*GP*TP*GP*TP*GP*TP*AP*TP*AP*TP*AP*TP*AP*CP*AP*CP*AP*TP*AP*TP*AP))
    • DNA: DNA (5'-D(P*TP*AP*TP*AP*TP*GP*TP*GP*TP*AP*TP*AP*TP*AP*TP*AP*CP*AP*CP*AP*CP*A)-3')
  • Ligand: MAGNESIUM ION

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Supramolecule #1: Phage T6 topoisomerase II central domian bound with G-segment DNA

SupramoleculeName: Phage T6 topoisomerase II central domian bound with G-segment DNA
type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#4
Source (natural)Organism: Enterobacteria phage T6 (virus)

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Macromolecule #1: DNA topoisomerase medium subunit

MacromoleculeName: DNA topoisomerase medium subunit / type: protein_or_peptide / ID: 1 / Number of copies: 2 / Enantiomer: LEVO / EC number: DNA topoisomerase (ATP-hydrolysing)
Source (natural)Organism: Escherichia phage T4 (virus)
Molecular weightTheoretical: 51.951973 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: MQLNNRDLKS IIDNEALAYA MYTVENRAIP NMIDGFKPVQ RFVIARALDL ARGNKDKFHK LASIAGGVAD LGYHHGENSA QDAGALMAN TWNNNFPLLD GQGNFGSRTV QKAAASRYIF ARVSKNFYNV YKDTEYAPVH QDKEHIPPAF YLPIIPTVLL N GVSGIATG ...String:
MQLNNRDLKS IIDNEALAYA MYTVENRAIP NMIDGFKPVQ RFVIARALDL ARGNKDKFHK LASIAGGVAD LGYHHGENSA QDAGALMAN TWNNNFPLLD GQGNFGSRTV QKAAASRYIF ARVSKNFYNV YKDTEYAPVH QDKEHIPPAF YLPIIPTVLL N GVSGIATG YATYILPHSV SSVKKAVLQA LQGKKVTKPK VEFPEFRGEV VEIDGQYEIR GTYKFTSRTQ MHITEIPYKY DR ETYVSKI LDPLENKGFI TWDDACGEHG FGFKVKFRKE YSLSDNEEER HAKIMKDFGL IERRSQNITV INEKGKLQVY DNV VDLIKD FVEVRKTYVQ KRIDNKIKET ESAFRLAFAK AHFIKKVISG EIVVQGKTRK ELTEELSKID MYSSYVDKLV GMNI FHMTS DEAKKLAEEA KAKKEENEYW KTTDVVTEYT KDLEEIKHHH HHHHHHH

UniProtKB: DNA topoisomerase medium subunit

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Macromolecule #2: DNA topoisomerase (ATP-hydrolyzing)

MacromoleculeName: DNA topoisomerase (ATP-hydrolyzing) / type: protein_or_peptide / ID: 2 / Number of copies: 2 / Enantiomer: LEVO / EC number: DNA topoisomerase (ATP-hydrolysing)
Source (natural)Organism: Salmonella phage Chi (virus)
Molecular weightTheoretical: 69.237289 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: MIKNEIKILS DIEHIKKRSG MYIGSSANEM HERFLFGKWE SVQYVPGLVK LIDEIIDNSV DEGIRTKFKF ANKINVTIKN NQVTVEDNG RGIPQAMVKT PTGEEIPGPV AAWTIPKAGG NFGDDKERVT GGMNGVGSSL TNIFSVMFVG ETGDGQNNIV V RCSNGMEN ...String:
MIKNEIKILS DIEHIKKRSG MYIGSSANEM HERFLFGKWE SVQYVPGLVK LIDEIIDNSV DEGIRTKFKF ANKINVTIKN NQVTVEDNG RGIPQAMVKT PTGEEIPGPV AAWTIPKAGG NFGDDKERVT GGMNGVGSSL TNIFSVMFVG ETGDGQNNIV V RCSNGMEN KSWETIPGKW KGTRVTFIPD FMSFETNELS QVYLDITLDR LQTLAVVYPD IQFTFNGKKV QGNFKKYARQ YD EHAIVQE QENCSIAVGR SPDGFRQLTY VNNIHTKNGG HHIDCVMDDI CEDLIPQIKR KFKIDVTKAR VKECLTIVMF VRD MKNMRF DSQTKERLTS PFGEIRSHIQ LDAKKISRAI LNNEAILMPI IEAALARKLA AEKAAETKAA KKASKAKVHK HIKA NLCGK DADTTLFLTE GDSAIGYLID VRDKELHGGY PLRGKVLNSW GMSYADMLKN KELFDICAIT GLVLGEKAEN LNYHN IAIM TDADHDGLGS IYPSLLGFFS NWPELFEQGR IRFVKTPVII AHVGKKQEWF YTVAEYESAK DALPKHSIRY IKGLGS LEK SEYREMIQNP VYDVVKLPEN WKELFEMLMG DNADLRKEWM SQHHHHHH

UniProtKB: DNA topoisomerase (ATP-hydrolyzing)

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Macromolecule #3: DNA(5'-D(P*TP*GP*TP*GP*TP*GP*TP*AP*TP*AP*TP*AP*TP*AP*CP*AP*CP*AP*...

MacromoleculeName: DNA(5'-D(P*TP*GP*TP*GP*TP*GP*TP*AP*TP*AP*TP*AP*TP*AP*CP*AP*CP*AP*TP*AP*TP*AP))
type: dna / ID: 3 / Number of copies: 1 / Classification: DNA
Source (natural)Organism: DNA molecule (others)
Molecular weightTheoretical: 6.764413 KDa
SequenceString:
(DT)(DG)(DT)(DG)(DT)(DG)(DT)(DA)(DT)(DA) (DT)(DA)(DT)(DA)(DC)(DA)(DC)(DA)(DT)(DA) (DT)(DA)

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Macromolecule #4: DNA (5'-D(P*TP*AP*TP*AP*TP*GP*TP*GP*TP*AP*TP*AP*TP*AP*TP*AP*CP*AP...

MacromoleculeName: DNA (5'-D(P*TP*AP*TP*AP*TP*GP*TP*GP*TP*AP*TP*AP*TP*AP*TP*AP*CP*AP*CP*AP*CP*A)-3')
type: dna / ID: 4 / Number of copies: 1 / Classification: DNA
Source (natural)Organism: DNA molecule (others)
Molecular weightTheoretical: 6.733403 KDa
SequenceString:
(DT)(DA)(DT)(DA)(DT)(DG)(DT)(DG)(DT)(DA) (DT)(DA)(DT)(DA)(DT)(DA)(DC)(DA)(DC)(DA) (DC)(DA)

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Macromolecule #5: MAGNESIUM ION

MacromoleculeName: MAGNESIUM ION / type: ligand / ID: 5 / Number of copies: 1 / Formula: MG
Molecular weightTheoretical: 24.305 Da

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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: 6
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K2 QUANTUM (4k x 4k) / Detector mode: COUNTING / 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: 2.0 µm / Nominal defocus min: 1.2 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

CTF correctionType: PHASE FLIPPING ONLY
Startup modelType of model: OTHER
Final reconstructionResolution.type: BY AUTHOR / Resolution: 2.8 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 713922
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD

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