5WTJ

Crystal structure of an endonuclease


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.503 Å
  • R-Value Free: 0.291 
  • R-Value Work: 0.263 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Two Distant Catalytic Sites Are Responsible for C2c2 RNase Activities

Liu, L.Li, X.Wang, J.Wang, M.Chen, P.Yin, M.Li, J.Sheng, G.Wang, Y.

(2017) Cell 168: 121-134.e12

  • DOI: 10.1016/j.cell.2016.12.031
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • C2c2, the effector of type VI CRISPR-Cas systems, has two RNase activities-one for cutting its RNA target and the other for processing the CRISPR RNA (crRNA). Here, we report the structures of Leptotrichia shahii C2c2 in its crRNA-free and crRNA-boun ...

    C2c2, the effector of type VI CRISPR-Cas systems, has two RNase activities-one for cutting its RNA target and the other for processing the CRISPR RNA (crRNA). Here, we report the structures of Leptotrichia shahii C2c2 in its crRNA-free and crRNA-bound states. While C2c2 has a bilobed structure reminiscent of all other Class 2 effectors, it also exhibits different structural characteristics. It contains the REC lobe with a Helical-1 domain and the NUC lobe with two HEPN domains. The two RNase catalytic pockets responsible for cleaving pre-crRNA and target RNA are independently located on Helical-1 and HEPN domains, respectively. crRNA binding induces significant conformational changes that are likely to stabilize crRNA binding and facilitate target RNA recognition. These structures provide important insights into the molecular mechanism of dual RNase activities of C2c2 and establish a framework for its future engineering as a RNA editing tool.


    Organizational Affiliation

    Key Laboratory of RNA Biology, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
CRISPR-associated endoribonuclease C2c2
A, B
1397Leptotrichia shahii (strain DSM 19757 / CCUG 47503 / CIP 107916 / JCM 16776 / LB37)Mutation(s): 0 
Gene Names: cas13a (c2c2)
EC: 3.1.-.-
Find proteins for P0DOC6 (Leptotrichia shahii (strain DSM 19757 / CCUG 47503 / CIP 107916 / JCM 16776 / LB37))
Go to UniProtKB:  P0DOC6
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A, B
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.503 Å
  • R-Value Free: 0.291 
  • R-Value Work: 0.263 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 91.658α = 90.00
b = 94.231β = 90.00
c = 338.218γ = 90.00
Software Package:
Software NamePurpose
HKL-3000data scaling
PHENIXrefinement
PHENIXphasing
HKL-3000data processing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2016-12-13 
  • Released Date: 2017-02-08 
  • Deposition Author(s): Liu, L., Wang, Y.

Revision History 

  • Version 1.0: 2017-02-08
    Type: Initial release
  • Version 1.1: 2017-08-30
    Type: Data collection