1MZW

Crystal structure of a U4/U6 snRNP complex between human spliceosomal cyclophilin H and a U4/U6-60K peptide


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.212 
  • R-Value Work: 0.195 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal structure of a complex between human spliceosomal cyclophilin H and a U4/U6 snRNP-60K peptide

Reidt, U.Wahl, M.C.Fasshauer, D.Horowitz, D.S.Luehrmann, R.Ficner, R.

(2003) J.Mol.Biol. 331: 45-56


  • PubMed Abstract: 
  • The spliceosomal cyclophilin H is a specific component of the human U4/U6 small nuclear ribonucleoprotein particle, interacting with homologous sequences in the proteins U4/U6-60K and hPrp18 during pre-mRNA splicing. We determined the crystal structu ...

    The spliceosomal cyclophilin H is a specific component of the human U4/U6 small nuclear ribonucleoprotein particle, interacting with homologous sequences in the proteins U4/U6-60K and hPrp18 during pre-mRNA splicing. We determined the crystal structure of the complex comprising cyclophilin H and the cognate domain of U4/U6-60K. The 31 amino acid fragment of U4/U6-60K is bound to a region remote from the cyclophilin active site. Residues Ile118-Phe121 of U4/U6-60K expand the central beta-sheet of cyclophilin H and the side-chain of Phe121 inserts into a hydrophobic cavity. Concomitantly, in the crystal the cyclophilin H active site is occupied by the N terminus of a neighboring cyclophilin H molecule in a substrate-like manner, indicating the capacity of joint binding to a substrate and to U4/U6-60K. Free and complexed cyclophilin H have virtually identical conformations suggesting that the U4/U6-60K binding site is pre-shaped and the peptidyl-prolyl-cis/trans isomerase activity is unaffected by complex formation. The complex defines a novel protein-protein interaction mode for a cyclophilin, allowing cyclophilin H to mediate interactions between different proteins inside the spliceosome or to initiate from its binding platforms isomerization or chaperoning activities.


    Organizational Affiliation

    Abteilung für Zelluläre Biochemie, Max-Planck-Institut für Biophysikalische Chemie, 37077 Göttingen, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
U-snRNP-associated cyclophilin
A
177Homo sapiensMutation(s): 0 
Gene Names: PPIH (CYP20, CYPH)
EC: 5.2.1.8
Find proteins for O43447 (Homo sapiens)
Go to Gene View: PPIH
Go to UniProtKB:  O43447
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
U4/U6 snrnp 60kDa protein
B
31Homo sapiensMutation(s): 0 
Gene Names: PRPF4 (PRP4)
Find proteins for O43172 (Homo sapiens)
Go to Gene View: PRPF4
Go to UniProtKB:  O43172
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.212 
  • R-Value Work: 0.195 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 44.369α = 90.00
b = 59.526β = 110.65
c = 47.040γ = 90.00
Software Package:
Software NamePurpose
DENZOdata reduction
CNSphasing
CNSrefinement
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-08-19
    Type: Initial release
  • Version 1.1: 2008-04-28
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance