7XSO

Structure of the type III-E CRISPR-Cas effector gRAMP

Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.01 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


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Literature

Target RNA activates the protease activity of Craspase to confer antiviral defense.

Liu, X., Zhang, L., Wang, H., Xiu, Y., Huang, L., Gao, Z., Li, N., Li, F., Xiong, W., Gao, T., Zhang, Y., Yang, M., Feng, Y.

(2022) Mol Cell 82: 4503-4518.e8

  • DOI: https://doi.org/10.1016/j.molcel.2022.10.007
  • Primary Citation of Related Structures:  
    7XSO, 7XSP, 7XSQ, 7XSR, 7XSS, 7XT4

  • PubMed Abstract: 

    • In the type III-E CRISPR-Cas system, a Cas effector (gRAMP) is associated with a TPR-CHAT to form Craspase (CRISPR-guided caspase). However, both the structural features of gRAMP and the immunity mechanism remain unknown for this system. Here, we report structures of gRAMP-crRNA and gRAMP:cRNA:target RNA as well as structures of Craspase and Craspase complexed with cognate target RNA (CTR) or non-cognate target RNA (NTR) ...

    In the type III-E CRISPR-Cas system, a Cas effector (gRAMP) is associated with a TPR-CHAT to form Craspase (CRISPR-guided caspase). However, both the structural features of gRAMP and the immunity mechanism remain unknown for this system. Here, we report structures of gRAMP-crRNA and gRAMP:cRNA:target RNA as well as structures of Craspase and Craspase complexed with cognate target RNA (CTR) or non-cognate target RNA (NTR). Importantly, the 3' anti-tag region of NTR and CTR binds at two distinct channels in Craspase, and CTR with a non-complementary 3' anti-tag induces a marked conformational change of the TPR-CHAT, which allosterically activates its protease activity to cleave an ancillary protein Csx30. This cleavage then triggers an abortive infection as the antiviral strategy of the type III-E system. Together, our study provides crucial insights into both the catalytic mechanism of the gRAMP and the immunity mechanism of the type III-E system.

    Organizational Affiliation: 

    Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing Key Laboratory of Bioprocess, State Key Laboratory of Chemical Resource Engineering, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing 100029, China. Electronic address: fengyue@mail.buct.edu.cn.



Macromolecules

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
RAMP superfamily proteinA1,722Candidatus Scalindua brodaeMutation(s): 0 
Gene Names: SCABRO_02597
UniProt
Find proteins for A0A0B0EGF3 (Candidatus Scalindua brodae)
Explore A0A0B0EGF3 
Go to UniProtKB:  A0A0B0EGF3
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A0B0EGF3
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsLengthOrganismImage
RNA (35-MER)B [auth D]74Candidatus Scalindua brodae
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.01 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Science Foundation (NSF, China)China32171274

Revision History  (Full details and data files)

  • Version 1.0: 2023-03-22
    Type: Initial release