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- EMDB-9318: Tetrahedral oligomeric complex of GyrA N-terminal fragment, solve... -
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Open data
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Basic information
Entry | Database: EMDB / ID: EMD-9318 | ||||||||||||||||||
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Title | Tetrahedral oligomeric complex of GyrA N-terminal fragment, solved by cryoEM in tetrahedral symmetry | ||||||||||||||||||
![]() | Tetrahedral oligomeric complex of GyrA N-terminal fragment, solved by cryoEM in tetrahedral symmetry | ||||||||||||||||||
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Function / homology | ![]() DNA negative supercoiling activity / DNA topoisomerase type II (double strand cut, ATP-hydrolyzing) complex / DNA topoisomerase type II (double strand cut, ATP-hydrolyzing) activity / ![]() ![]() ![]() ![]() ![]() Similarity search - Function | ||||||||||||||||||
Biological species | ![]() ![]() | ||||||||||||||||||
Method | ![]() ![]() | ||||||||||||||||||
![]() | Soczek KM / Grant T | ||||||||||||||||||
Funding support | ![]() ![]()
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![]() | ![]() Title: CryoEM structures of open dimers of gyrase A in complex with DNA illuminate mechanism of strand passage. Authors: Katarzyna M Soczek / Tim Grant / Peter B Rosenthal / Alfonso Mondragón / ![]() ![]() Abstract: Gyrase is a unique type IIA topoisomerase that uses ATP hydrolysis to maintain the negatively supercoiled state of bacterial DNA. In order to perform its function, gyrase undergoes a sequence of ...Gyrase is a unique type IIA topoisomerase that uses ATP hydrolysis to maintain the negatively supercoiled state of bacterial DNA. In order to perform its function, gyrase undergoes a sequence of conformational changes that consist of concerted gate openings, DNA cleavage, and DNA strand passage events. Structures where the transported DNA molecule (T-segment) is trapped by the A subunit have not been observed. Here we present the cryoEM structures of two oligomeric complexes of open gyrase A dimers and DNA. The protein subunits in these complexes were solved to 4 Å and 5.2 Å resolution. One of the complexes traps a linear DNA molecule, a putative T-segment, which interacts with the open gyrase A dimers in two states, representing steps either prior to or after passage through the DNA-gate. The structures locate the T-segment in important intermediate conformations of the catalytic cycle and provide insights into gyrase-DNA interactions and mechanism. | ||||||||||||||||||
History |
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Structure visualization
Movie |
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Structure viewer | EM map: ![]() ![]() ![]() |
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 73.3 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 16.5 KB 16.5 KB | Display Display | ![]() |
FSC (resolution estimation) | ![]() | 9.8 KB | Display | ![]() |
Images | ![]() | 52.1 KB | ||
Filedesc metadata | ![]() | 6.4 KB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 6n1rMC ![]() 9316C ![]() 9317C ![]() 6n1pC ![]() 6n1qC C: citing same article ( M: atomic model generated by this map |
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Similar structure data |
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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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Annotation | Tetrahedral oligomeric complex of GyrA N-terminal fragment, solved by cryoEM in tetrahedral symmetry | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Projections & slices | Image control
Images are generated by Spider. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 1.04 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
CCP4 map header:
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-Supplemental data
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Sample components
-Entire : Tetrahedral complex of DNA Gyrase A subunit N-terminal fragment, ...
Entire | Name: Tetrahedral complex of DNA Gyrase A subunit N-terminal fragment, solved by cryoEM in T symmetry |
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Components |
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-Supramolecule #1: Tetrahedral complex of DNA Gyrase A subunit N-terminal fragment, ...
Supramolecule | Name: Tetrahedral complex of DNA Gyrase A subunit N-terminal fragment, solved by cryoEM in T symmetry type: complex / ID: 1 / Parent: 0 / Macromolecule list: all |
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Source (natural) | Organism: ![]() ![]() |
Molecular weight | Theoretical: 695 KDa |
-Macromolecule #1: DNA gyrase subunit A
Macromolecule | Name: DNA gyrase subunit A / type: protein_or_peptide / ID: 1 / Number of copies: 12 / Enantiomer: LEVO / EC number: ![]() |
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Source (natural) | Organism: ![]() ![]() |
Molecular weight | Theoretical: 57.977578 KDa |
Recombinant expression | Organism: ![]() ![]() ![]() |
Sequence | String: MHHHHHHSSG VDLGTENLYF QSIAMQDKNL VNVNLTKEMK ASFIDYAMSV IVARALPDVR DGLKPVHRRI LYGMNELGVT PDKPHKKSA RITGDVMGKY HPHGDSSIYE AMVRMAQWWS YRYMLVDGHG NFGSMDGDSA AAQRYTEARM SKIALEMLRD I NKNTVDFV ...String: MHHHHHHSSG VDLGTENLYF QSIAMQDKNL VNVNLTKEMK ASFIDYAMSV IVARALPDVR DGLKPVHRRI LYGMNELGVT PDKPHKKSA RITGDVMGKY HPHGDSSIYE AMVRMAQWWS YRYMLVDGHG NFGSMDGDSA AAQRYTEARM SKIALEMLRD I NKNTVDFV DNYDANEREP LVLPARFPNL LVNGATGIAV GMATNIPPHN LGETIDAVKL VMDNPEVTTK DLMEVLPGPD FP TGALVMG KSGIHKAYET GKGSIVLRSR TEIETTKTGR ERIVVTEFPY MVNKTKVHEH IVRLVQEKRI EGITAVRDES NRE GVRFVI EVKRDASANV ILNNLFKMTQ MQTNFGFNML AIQNGIPKIL SLRQILDAYI EHQKEVVVRR TRFDKEKAEA RAHI LEGLL IALDHIDEVI RIIRASETDA EAQAELMSKF KLSERQSQAI LDMRLRRLTG LERDKIQSEY DDLLALIADL ADILA KPER VSQIIKDELD EVKRKFSDKR RTELMVG UniProtKB: ![]() |
-Experimental details
-Structure determination
Method | ![]() |
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Aggregation state | particle |
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Sample preparation
Buffer | pH: 7.5 Component:
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Grid | Model: C-flat-1.2/1.3 4C / Material: COPPER / Mesh: 400 / Support film - Material: CARBON / Pretreatment - Type: GLOW DISCHARGE | ||||||||||||
Vitrification | Cryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK IV |
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Electron microscopy
Microscope | FEI TITAN KRIOS |
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Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | C2 aperture diameter: 50.0 µm / Calibrated magnification: 46430 / Illumination mode: OTHER / Imaging mode: BRIGHT FIELD![]() |
Specialist optics | Energy filter - Name: GIF Quantum LS / Energy filter - Slit width: 20 eV |
Sample stage | Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN |
Temperature | Min: 100.0 K / Max: 100.0 K |
Image recording | Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Detector mode: COUNTING / Digitization - Dimensions - Width: 3710 pixel / Digitization - Dimensions - Height: 3838 pixel / Digitization - Frames/image: 1-40 / Number real images: 4265 / Average exposure time: 14.0 sec. / Average electron dose: 74.0 e/Å2 |
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Image processing
-Atomic model buiding 1
Initial model | PDB ID: Chain - Chain ID: A / Chain - Residue range: 2-486 / Chain - Source name: PDB / Chain - Initial model type: experimental model |
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Refinement | Space: REAL / Protocol: FLEXIBLE FIT / Target criteria: correlation coefficient |
Output model | ![]() PDB-6n1r: |