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- EMDB-43140: CyoEM structure of the TnsC(1-503)-TnsD(1-318)-DNA complex in a 6... -
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Open data
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Basic information
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Title | CyoEM structure of the TnsC(1-503)-TnsD(1-318)-DNA complex in a 6:2:1 stoichiometry from E. coli Tn7 bound to ATPgS and ADP | |||||||||
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![]() | Transposon / AAA+ ATPase / Oligomer / Complex / DNA-binding protein DNA complex / DNA BINDING PROTEIN / DNA BINDING PROTEIN-DNA complex | |||||||||
Function / homology | ![]() transposition / DNA recombination / ATP hydrolysis activity / DNA binding / ATP binding Similarity search - Function | |||||||||
Biological species | ![]() ![]() | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 3.83 Å | |||||||||
![]() | Shen Y / Guarne A | |||||||||
Funding support | ![]()
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![]() | ![]() Title: Assembly of the Tn7 targeting complex by a regulated stepwise process. Authors: Yao Shen / Shreya S Krishnan / Michael T Petassi / Mark A Hancock / Joseph E Peters / Alba Guarné / ![]() ![]() Abstract: The Tn7 family of transposons is notable for its highly regulated integration mechanisms, including programmable RNA-guided transposition. The targeting pathways rely on dedicated target selection ...The Tn7 family of transposons is notable for its highly regulated integration mechanisms, including programmable RNA-guided transposition. The targeting pathways rely on dedicated target selection proteins from the TniQ family and the AAA+ adaptor TnsC to recruit and activate the transposase at specific target sites. Here, we report the cryoelectron microscopy (cryo-EM) structures of TnsC bound to the TniQ domain of TnsD from prototypical Tn7 and unveil key regulatory steps stemming from unique behaviors of ATP- versus ADP-bound TnsC. We show that TnsD recruits ADP-bound dimers of TnsC and acts as an exchange factor to release one protomer with exchange to ATP. This loading process explains how TnsC assembles a heptameric ring unidirectionally from the target site. This unique loading process results in functionally distinct TnsC protomers within the ring, providing a checkpoint for target immunity and explaining how insertions at programmed sites precisely occur in a specific orientation across Tn7 elements. | |||||||||
History |
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Structure visualization
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 162.3 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 20.1 KB 20.1 KB | Display Display | ![]() |
FSC (resolution estimation) | ![]() | 12 KB | Display | ![]() |
Images | ![]() | 126.3 KB | ||
Filedesc metadata | ![]() | 6.5 KB | ||
Others | ![]() ![]() | 165.1 MB 165.1 MB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Validation report
Summary document | ![]() | 1.1 MB | Display | ![]() |
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Full document | ![]() | 1.1 MB | Display | |
Data in XML | ![]() | 20.8 KB | Display | |
Data in CIF | ![]() | 26.6 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 8vctMC ![]() 8gluC ![]() 8glwC ![]() 8glxC ![]() 8vcjC 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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Projections & slices | Image control
Images are generated by Spider. | ||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 0.855 Å | ||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
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-Supplemental data
-Half map: #2
File | emd_43140_half_map_1.map | ||||||||||||
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Projections & Slices |
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Density Histograms |
-Half map: #1
File | emd_43140_half_map_2.map | ||||||||||||
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Projections & Slices |
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Density Histograms |
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Sample components
+Entire : CyoEM structure of the TnsC(1-503)-TnsD(1-318)-DNA complex in a 6...
+Supramolecule #1: CyoEM structure of the TnsC(1-503)-TnsD(1-318)-DNA complex in a 6...
+Supramolecule #2: TnsC(1-503)-TnsD(1-318)
+Supramolecule #3: DNA
+Macromolecule #1: Transposon Tn7 transposition protein TnsC
+Macromolecule #2: Transposon Tn7 transposition protein TnsD
+Macromolecule #3: DNA (50-MER)
+Macromolecule #4: DNA (50-MER)
+Macromolecule #5: PHOSPHOTHIOPHOSPHORIC ACID-ADENYLATE ESTER
+Macromolecule #6: MAGNESIUM ION
+Macromolecule #7: ZINC ION
+Macromolecule #8: ADENOSINE-5'-DIPHOSPHATE
-Experimental details
-Structure determination
Method | cryo EM |
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![]() | single particle reconstruction |
Aggregation state | particle |
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Sample preparation
Concentration | 1 mg/mL |
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Buffer | pH: 8 |
Grid | Material: COPPER / 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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Image recording | Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Average electron dose: 60.0 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.5 µm / Nominal defocus min: 1.25 µm |
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Image processing
-Atomic model buiding 1
Refinement | Protocol: OTHER |
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Output model | ![]() PDB-8vct: |