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: 2.00 Å
  • R-Value Free: 0.212 
  • R-Value Work: 0.195 
  • R-Value Observed: 0.195 

Starting Model: experimental
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This is version 1.3 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

  • DOI: https://doi.org/10.1016/s0022-2836(03)00684-3
  • Primary Citation of Related Structures:  
    1MZW

  • 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 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:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
U-snRNP-associated cyclophilin177Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for O43447 (Homo sapiens)
Explore O43447 
Go to UniProtKB:  O43447
PHAROS:  O43447
GTEx:  ENSG00000171960 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO43447
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
U4/U6 snrnp 60kDa protein31N/AMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for O43172 (Homo sapiens)
Explore O43172 
Go to UniProtKB:  O43172
PHAROS:  O43172
GTEx:  ENSG00000136875 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO43172
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.212 
  • R-Value Work: 0.195 
  • R-Value Observed: 0.195 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 44.369α = 90
b = 59.526β = 110.65
c = 47.04γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
CNSrefinement
CNSphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-08-19
    Type: Initial release
  • Version 1.1: 2008-04-28
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2024-02-14
    Changes: Data collection, Database references, Refinement description