6IG0

Type III-A Csm complex, Cryo-EM structure of Csm-CTR1, ATP bound


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.37 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structure Studies of the CRISPR-Csm Complex Reveal Mechanism of Co-transcriptional Interference

You, L.Ma, J.Wang, J.Artamonova, D.Wang, M.Liu, L.Xiang, H.Severinov, K.Zhang, X.Wang, Y.

(2019) Cell 176: 239-253.e16

  • DOI: https://doi.org/10.1016/j.cell.2018.10.052
  • Primary Citation of Related Structures:  
    6IFK, 6IFL, 6IFN, 6IFR, 6IFU, 6IFY, 6IFZ, 6IG0

  • PubMed Abstract: 

    Csm, a type III-A CRISPR-Cas interference complex, is a CRISPR RNA (crRNA)-guided RNase that also possesses target RNA-dependent DNase and cyclic oligoadenylate (cOA) synthetase activities. However, the structural features allowing target RNA-binding-dependent activation of DNA cleavage and cOA generation remain unknown. Here, we report the structure of Csm in complex with crRNA together with structures of cognate or non-cognate target RNA bound Csm complexes. We show that depending on complementarity with the 5' tag of crRNA, the 3' anti-tag region of target RNA binds at two distinct sites of the Csm complex. Importantly, the interaction between the non-complementary anti-tag region of cognate target RNA and Csm1 induces a conformational change at the Csm1 subunit that allosterically activates DNA cleavage and cOA generation. Together, our structural studies provide crucial insights into the mechanistic processes required for crRNA-meditated sequence-specific RNA cleavage, RNA target-dependent non-specific DNA cleavage, and cOA generation.


  • Organizational Affiliation

    Center for Life Sciences, Skolkovo Institute of Science and Technology, Skolkovo 121205, Russia.


Macromolecules

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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Type III-A CRISPR-associated protein Csm1758Streptococcus thermophilus ND03Mutation(s): 1 
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Type III-A CRISPR-associated protein Csm2B [auth D],
C
126Streptococcus thermophilus ND03Mutation(s): 0 
Gene Names: csm2
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Type III-A CRISPR-associated RAMP protein Csm3D [auth G],
E [auth F],
F [auth E]
220Streptococcus thermophilus ND03Mutation(s): 1 
Gene Names: csm3
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
Type III-A CRISPR-associated RAMP protein Csm4G [auth B]299Streptococcus thermophilus ND03Mutation(s): 0 
Gene Names: csm4
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Entity ID: 5
MoleculeChains Sequence LengthOrganismDetailsImage
Type III-A CRISPR-associated RAMP protein Csm5357Streptococcus thermophilus ND03Mutation(s): 0 
Gene Names: csm5
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Entity ID: 6
MoleculeChains LengthOrganismImage
crRNAI [auth N]36Streptococcus thermophilus ND03
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Entity ID: 7
MoleculeChains LengthOrganismImage
CTR142Streptococcus thermophilus ND03
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Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.37 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2018-12-12
    Type: Initial release
  • Version 1.1: 2018-12-19
    Changes: Data collection, Database references
  • Version 1.2: 2019-01-23
    Changes: Data collection, Database references