7N6I

ATP-bound TnsC-TniQ complex from ShCAST system

Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.90 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history. 


Literature

Structural basis for target site selection in RNA-guided DNA transposition systems.

Park, J.U., Tsai, A.W., Mehrotra, E., Petassi, M.T., Hsieh, S.C., Ke, A., Peters, J.E., Kellogg, E.H.

(2021) Science 373: 768-774

  • DOI: https://doi.org/10.1126/science.abi8976
  • Primary Citation of Related Structures:  
    7M99, 7M9A, 7M9B, 7M9C, 7N6I

  • PubMed Abstract: 

    • CRISPR-associated transposition systems allow guide RNA-directed integration of a single DNA cargo in one orientation at a fixed distance from a programmable target sequence. We used cryo-electron microscopy (cryo-EM) to define the mechanism that underlies this process by characterizing the transposition regulator, TnsC, from a type V-K CRISPR-transposase system ...

    CRISPR-associated transposition systems allow guide RNA-directed integration of a single DNA cargo in one orientation at a fixed distance from a programmable target sequence. We used cryo-electron microscopy (cryo-EM) to define the mechanism that underlies this process by characterizing the transposition regulator, TnsC, from a type V-K CRISPR-transposase system. In this scenario, polymerization of adenosine triphosphate-bound TnsC helical filaments could explain how polarity information is passed to the transposase. TniQ caps the TnsC filament, representing a universal mechanism for target information transfer in Tn7/Tn7-like elements. Transposase-driven disassembly establishes delivery of the element only to unused protospacers. Finally, TnsC transitions to define the fixed point of insertion, as revealed by structures with the transition state mimic ADP•AlF 3 These mechanistic findings provide the underpinnings for engineering CRISPR-associated transposition systems for research and therapeutic applications.

    Organizational Affiliation: 

    Department of Molecular Biology and Genetics, Cornell University, Ithaca, NY 14853, USA. joe.peters@cornell.edu ehk68@cornell.edu.



Macromolecules

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
TniQ (Homology model)
A, B
167Scytonema hofmanniiMutation(s): 0 
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
TnsC
C, D, E, F, G
C, D, E, F, G, H, I, J
276Scytonema hofmanniiMutation(s): 0 
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Entity ID: 3
MoleculeChainsLengthOrganismImage
DNA (5'-D(P*TP*TP*TP*TP*TP*TP*TP*TP*TP*TP*TP*TP*TP*TP*TP*TP*T)-3')17synthetic construct
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Entity ID: 4
MoleculeChainsLengthOrganismImage
DNA (5'-D(P*AP*AP*AP*AP*AP*AP*AP*AP*AP*AP*AP*AP*AP*AP*AP*AP*A)-3')17synthetic construct
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.90 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
RECONSTRUCTIONRELION3.1

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesM R00-GM124463

Revision History  (Full details and data files)

  • Version 1.0: 2021-07-28
    Type: Initial release
  • Version 1.1: 2021-08-25
    Changes: Database references