1RYM

Structure of the Group II Intron Splicing Factor CRS2


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.190 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural analysis of the group II intron splicing factor CRS2 yields insights into its protein and RNA interaction surfaces

Ostheimer, G.J.Hadjivasiliou, H.Kloer, D.P.Barkan, A.Matthews, B.W.

(2005) J.Mol.Biol. 345: 51-68

  • DOI: 10.1016/j.jmb.2004.10.032
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Chloroplast RNA splicing 2 (CRS2) is a nuclear-encoded protein required for the splicing of nine group II introns in maize chloroplasts. CRS2 functions in the context of splicing complexes that include one of two CRS2-associated factors (CAF1 and CAF ...

    Chloroplast RNA splicing 2 (CRS2) is a nuclear-encoded protein required for the splicing of nine group II introns in maize chloroplasts. CRS2 functions in the context of splicing complexes that include one of two CRS2-associated factors (CAF1 and CAF2). The CRS2-CAF1 and CRS2-CAF2 complexes are required for the splicing of different subsets of CRS2-dependent introns, and they bind tightly and specifically to their genetically defined intron targets in vivo. The CRS2 amino acid sequence is closely related to those of bacterial peptidyl-tRNA hydrolases (PTHs). To identify the structural differences between CRS2 and bacterial PTHs responsible for CRS2's gains of CAF binding and intron splicing functions, we determined the structure of CRS2 by X-ray crystallography. The fold of CRS2 is the same as that of Escherichia coli PTH, but CRS2 has two surfaces that differ from the corresponding surfaces in PTH. One of these is more hydrophobic in CRS2 than in PTH. Site-directed mutagenesis of this surface blocked CRS2-CAF complex formation, indicating that it is the CAF binding site. The CRS2 surface corresponding to the putative tRNA binding face of PTH is considerably more basic than in PTH, suggesting that CRS2 interacts with group II intron substrates via this surface. Both the sequence and the structural context of the amino acid residues essential for peptidyl-tRNA hydrolase activity are conserved in CRS2, yet expression of CRS2 is incapable of rescuing a pth(ts)E.coli strain.


    Organizational Affiliation

    Institute of Molecular Biology, University of Oregon, Eugene, OR 97403, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
protein CRS2
A
212Zea maysMutation(s): 1 
Gene Names: CRS2
Find proteins for Q9M5P4 (Zea mays)
Go to UniProtKB:  Q9M5P4
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.190 
  • Space Group: I 2 2 2
Unit Cell:
Length (Å)Angle (°)
a = 53.100α = 90.00
b = 79.600β = 90.00
c = 112.400γ = 90.00
Software Package:
Software NamePurpose
MOSFLMdata reduction
EPMRphasing
TNTrefinement
CCP4data scaling
SCALAdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-01-06
    Type: Initial release
  • Version 1.1: 2008-04-29
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance