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- PDB-8glu: CryoEM structure of TnsC(1-503) bound to TnsD(1-318) from E.coli Tn7 -

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Basic information

Entry
Database: PDB / ID: 8glu
TitleCryoEM structure of TnsC(1-503) bound to TnsD(1-318) from E.coli Tn7
Components(Transposon Tn7 transposition protein ...) x 2
KeywordsDNA BINDING PROTEIN / Transposon / AAA+ ATPase / Oligomer / Complex
Function / homology
Function and homology information


transposition / DNA recombination / ATP hydrolysis activity / DNA binding / ATP binding
Similarity search - Function
Transposon Tn7 transposition protein TnsD, C-termianl / Tn7-like transposition protein D / Tn7 transposition regulator TnsC / Tn7 transposition regulator TnsC / TniQ / TniQ / : / AAA domain / ATPases associated with a variety of cellular activities / AAA+ ATPase domain / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
ADENOSINE-5'-DIPHOSPHATE / ADENOSINE-5'-TRIPHOSPHATE / Transposon Tn7 transposition protein TnsC / Transposon Tn7 transposition protein TnsD
Similarity search - Component
Biological speciesEscherichia coli (E. coli)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.57 Å
AuthorsShen, Y. / Guarne, A.
Funding support Canada, 1items
OrganizationGrant numberCountry
Canadian Institutes of Health Research (CIHR)PJT-155941 Canada
CitationJournal: Mol Cell / Year: 2024
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
DepositionMar 23, 2023Deposition site: RCSB / Processing site: RCSB
Revision 1.0Jul 31, 2024Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
G: Transposon Tn7 transposition protein TnsC
X: Transposon Tn7 transposition protein TnsD
F: Transposon Tn7 transposition protein TnsC
E: Transposon Tn7 transposition protein TnsC
hetero molecules


Theoretical massNumber of molelcules
Total (without water)216,17311
Polymers214,5934
Non-polymers1,5807
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

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Transposon Tn7 transposition protein ... , 2 types, 4 molecules GFEX

#1: Protein Transposon Tn7 transposition protein TnsC / Protein E


Mass: 59318.926 Da / Num. of mol.: 3 / Mutation: S2G
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia coli (E. coli) / Gene: tnsC / Production host: Escherichia coli (E. coli) / References: UniProt: P05846
#2: Protein Transposon Tn7 transposition protein TnsD


Mass: 36636.020 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia coli (E. coli) / Gene: tnsD / Production host: Escherichia coli (E. coli) / References: UniProt: P13991

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Non-polymers , 4 types, 7 molecules

#3: Chemical ChemComp-ATP / ADENOSINE-5'-TRIPHOSPHATE


Mass: 507.181 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C10H16N5O13P3 / Feature type: SUBJECT OF INVESTIGATION / Comment: ATP, energy-carrying molecule*YM
#4: Chemical ChemComp-MG / MAGNESIUM ION


Mass: 24.305 Da / Num. of mol.: 3 / Source method: obtained synthetically / Formula: Mg / Feature type: SUBJECT OF INVESTIGATION
#5: Chemical ChemComp-ZN / ZINC ION


Mass: 65.409 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: Zn / Feature type: SUBJECT OF INVESTIGATION
#6: Chemical ChemComp-ADP / ADENOSINE-5'-DIPHOSPHATE


Mass: 427.201 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C10H15N5O10P2 / Feature type: SUBJECT OF INVESTIGATION / Comment: ADP, energy-carrying molecule*YM

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Details

Has ligand of interestY

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: Complex of TnsC(1-503) bound to TnsD(1-318) with cofactors ATP and ADP
Type: COMPLEX / Entity ID: #1-#2 / Source: RECOMBINANT
Molecular weightValue: 0.22 MDa / Experimental value: YES
Source (natural)Organism: Escherichia coli (E. coli)
Source (recombinant)Organism: Escherichia coli (E. coli)
Buffer solutionpH: 8
Details: 20 mM Tris pH 8.0, 150 mM NaCl, 1.4 mM beta-mercaptoethanol, 5 mM MgCl2
SpecimenConc.: 0.4 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: COPPER / Grid mesh size: 300 divisions/in. / Grid type: C-flat-2/1
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 277 K

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 2750 nm / Nominal defocus min: 1250 nm
Image recordingElectron dose: 76 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k)

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Processing

EM softwareName: PHENIX / Version: 1.19.2_4158: / Category: model refinement
CTF correctionType: NONE
3D reconstructionResolution: 3.57 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 330929 / Symmetry type: POINT
Atomic model buildingB value: 208 / Protocol: OTHER / Space: REAL
Atomic model building

3D fitting-ID: 1

IDPDB-IDAccession codeDetailsInitial refinement model-IDSource nameType
17MCS

7mcs

7MCSTnsC was modelled using PDB 7MCS.1PDBexperimental model
27MBW

7mbw

7MBWTnsC was modelled using PDB 7MCS.2PDBexperimental model
3TnsD was predicted using RaptorX.Otherother
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00312577
ELECTRON MICROSCOPYf_angle_d0.53417040
ELECTRON MICROSCOPYf_dihedral_angle_d4.3031726
ELECTRON MICROSCOPYf_chiral_restr0.0391904
ELECTRON MICROSCOPYf_plane_restr0.0042190

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