3FQD

Crystal Structure of the S. pombe Rat1-Rai1 Complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.218 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structure and function of the 5'-->3' exoribonuclease Rat1 and its activating partner Rai1.

Xiang, S.Cooper-Morgan, A.Jiao, X.Kiledjian, M.Manley, J.L.Tong, L.

(2009) Nature 458: 784-788

  • DOI: 10.1038/nature07731
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The 5'-->3' exoribonucleases (XRNs) comprise a large family of conserved enzymes in eukaryotes with crucial functions in RNA metabolism and RNA interference. XRN2, or Rat1 in yeast, functions primarily in the nucleus and also has an important role in ...

    The 5'-->3' exoribonucleases (XRNs) comprise a large family of conserved enzymes in eukaryotes with crucial functions in RNA metabolism and RNA interference. XRN2, or Rat1 in yeast, functions primarily in the nucleus and also has an important role in transcription termination by RNA polymerase II (refs 7-14). Rat1 exoribonuclease activity is stimulated by the protein Rai1 (refs 15, 16). Here we report the crystal structure at 2.2 A resolution of Schizosaccharomyces pombe Rat1 in complex with Rai1, as well as the structures of Rai1 and its murine homologue Dom3Z alone at 2.0 A resolution. The structures reveal the molecular mechanism for the activation of Rat1 by Rai1 and for the exclusive exoribonuclease activity of Rat1. Biochemical studies confirm these observations, and show that Rai1 allows Rat1 to degrade RNAs with stable secondary structure more effectively. There are large differences in the active site landscape of Rat1 compared to related and PIN (PilT N terminus) domain-containing nucleases. Unexpectedly, we identified a large pocket in Rai1 and Dom3Z that contains highly conserved residues, including three acidic side chains that coordinate a divalent cation. Mutagenesis and biochemical studies demonstrate that Rai1 possesses pyrophosphohydrolase activity towards 5' triphosphorylated RNA. Such an activity is important for messenger RNA degradation in bacteria, but this is, to our knowledge, the first demonstration of this activity in eukaryotes and suggests that Rai1/Dom3Z may have additional important functions in RNA metabolism.


    Organizational Affiliation

    Department of Biological Sciences, Columbia University, New York, New York 10027, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
5'-3' exoribonuclease 2
A
899Schizosaccharomyces pombe (strain 972 / ATCC 24843)Mutation(s): 0 
Gene Names: dhp1
EC: 3.1.13.-
Find proteins for P40848 (Schizosaccharomyces pombe (strain 972 / ATCC 24843))
Go to UniProtKB:  P40848
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Protein din1
B
352Schizosaccharomyces pombe (strain 972 / ATCC 24843)Mutation(s): 0 
Gene Names: din1
EC: 3.6.1.-
Find proteins for O13836 (Schizosaccharomyces pombe (strain 972 / ATCC 24843))
Go to UniProtKB:  O13836
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GOL
Query on GOL

Download SDF File 
Download CCD File 
B
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
MG
Query on MG

Download SDF File 
Download CCD File 
B
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
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: 2.2 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.218 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 96.690α = 90.00
b = 190.869β = 90.00
c = 84.619γ = 90.00
Software Package:
Software NamePurpose
REFMACrefinement
DENZOdata reduction
SnBphasing
PDB_EXTRACTdata extraction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2009-01-07 
  • Released Date: 2009-02-03 
  • Deposition Author(s): Xiang, S., Tong, L.

Revision History 

  • Version 1.0: 2009-02-03
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Non-polymer description, Version format compliance
  • Version 1.2: 2017-11-01
    Type: Refinement description