3QB5

Human C3PO complex in the presence of MnSO4

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.95 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.224 
  • R-Value Observed: 0.226 

wwPDB Validation   3D Report Full Report


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


Literature

Structure of C3PO and mechanism of human RISC activation.

Ye, X., Huang, N., Liu, Y., Paroo, Z., Huerta, C., Li, P., Chen, S., Liu, Q., Zhang, H.

(2011) Nat Struct Mol Biol 18: 650-657

  • DOI: 10.1038/nsmb.2032
  • Primary Citation of Related Structures:  
    3PJA, 3QB5

  • PubMed Abstract: 

    • Assembly of the RNA-induced silencing complex (RISC) consists of loading duplex (guide-passenger) siRNA onto Argonaute (Ago2) and removing the passenger strand. Ago2 contributes critically to RISC activation by nicking the passenger strand. Here we recon ...

    Assembly of the RNA-induced silencing complex (RISC) consists of loading duplex (guide-passenger) siRNA onto Argonaute (Ago2) and removing the passenger strand. Ago2 contributes critically to RISC activation by nicking the passenger strand. Here we reconstituted duplex siRNA-initiated RISC activity using recombinant human Ago2 (hAgo2) and C3PO, indicating that C3PO has a critical role in hAgo2-RISC activation. Consistently, genetic depletion of C3PO compromised RNA silencing in mammalian cells. We determined the crystal structure of hC3PO, which reveals an asymmetric octamer barrel consisting of six translin and two TRAX subunits. This asymmetric assembly is critical for the function of C3PO as an endonuclease that cleaves RNA at the interior surface. The current work supports a Dicer-independent mechanism for human RISC activation, in which Ago2 directly binds duplex siRNA and nicks the passenger strand, and then C3PO activates RISC by degrading the Ago2-nicked passenger strand.

    Organizational Affiliation: 

    Department of Biochemistry, University of Texas Southwestern Medical Center, Dallas, Texas, USA.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Translin A, B, C228Homo sapiensMutation(s): 0 
Gene Names: TSN
EC: 3.1
Find proteins for Q15631 (Homo sapiens)
Explore Q15631 
Go to UniProtKB:  Q15631
NIH Common Fund Data Resources
PHAROS:  Q15631
GTEx:  ENSG00000211460
Protein Feature View
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  • Reference Sequence
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Translin-associated protein X K290Homo sapiensMutation(s): 0 
Gene Names: TSNAX, TRAX
Find proteins for Q99598 (Homo sapiens)
Explore Q99598 
Go to UniProtKB:  Q99598
NIH Common Fund Data Resources
PHAROS:  Q99598
GTEx:  ENSG00000116918
Protein Feature View
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  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.95 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.224 
  • R-Value Observed: 0.226 
  • Space Group: P 61 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 98.166α = 90
b = 98.166β = 90
c = 446.466γ = 120
Software Package:
Software NamePurpose
HKL-3000data collection
PHASERphasing
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report


View more in-depth experimental data

Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-05-11
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance