3RIU

Crystal structure of Drosophila hexameric C3PO formed by truncated Translin and Trax


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.4 Å
  • R-Value Free: 0.338 
  • R-Value Work: 0.271 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Multimeric assembly and biochemical characterization of the Trax-translin endonuclease complex.

Tian, Y.Simanshu, D.K.Ascano, M.Diaz-Avalos, R.Park, A.Y.Juranek, S.A.Rice, W.J.Yin, Q.Robinson, C.V.Tuschl, T.Patel, D.J.

(2011) Nat.Struct.Mol.Biol. 18: 658-664

  • DOI: 10.1038/nsmb.2069

  • PubMed Abstract: 
  • Trax-translin heteromers, also known as C3PO, have been proposed to activate the RNA-induced silencing complex (RISC) by facilitating endonucleolytic cleavage of the siRNA passenger strand. We report on the crystal structure of hexameric Drosophila C ...

    Trax-translin heteromers, also known as C3PO, have been proposed to activate the RNA-induced silencing complex (RISC) by facilitating endonucleolytic cleavage of the siRNA passenger strand. We report on the crystal structure of hexameric Drosophila C3PO formed by truncated translin and Trax, along with electron microscopic and mass spectrometric studies on octameric C3PO formed by full-length translin and Trax. Our studies establish that Trax adopts the translin fold, possesses catalytic centers essential for C3PO's endoRNase activity and interacts extensively with translin to form an octameric assembly. The catalytic pockets of Trax subunits are located within the interior chamber of the octameric scaffold. Truncated C3PO, like full-length C3PO, shows endoRNase activity that leaves 3'-hydroxyl-cleaved ends. We have measured the catalytic activity of C3PO and shown it to cleave almost stoichiometric amounts of substrate per second.


    Organizational Affiliation

    Structural Biology Program, Memorial Sloan-Kettering Cancer Center, New York, New York, USA. Graduate Program in Neuroscience, Weill Medical College of Cornell University, New York, New York, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Translin
A, B
218Drosophila melanogasterMutation(s): 0 
Gene Names: trsn (Dmel\CG11761, TB-RBP, translin)
Find proteins for Q7JVK6 (Drosophila melanogaster)
Go to UniProtKB:  Q7JVK6
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Translin associated factor X, isoform B
C
269Drosophila melanogasterMutation(s): 0 
Gene Names: Trax (Dmel\CG5063, trax, Trax-RB)
Find proteins for Q9VF77 (Drosophila melanogaster)
Go to UniProtKB:  Q9VF77
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A, B, C
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.4 Å
  • R-Value Free: 0.338 
  • R-Value Work: 0.271 
  • Space Group: P 61 2 2
Unit Cell:
Length (Å)Angle (°)
a = 196.030α = 90.00
b = 196.030β = 90.00
c = 155.189γ = 120.00
Software Package:
Software NamePurpose
PHENIXrefinement
DENZOdata reduction
SHARPphasing
SCALEPACKdata scaling
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-05-11
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance
  • Version 1.2: 2017-11-08
    Type: Refinement description