Bovine Cyclophilin 40, Tetragonal Form

Experimental Data Snapshot

  • Resolution: 2.00 Å
  • R-Value Free: 0.305 
  • R-Value Work: 0.236 
  • R-Value Observed: 0.236 

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Two structures of cyclophilin 40: folding and fidelity in the TPR domains.

Taylor, P.Dornan, J.Carrello, A.Minchin, R.F.Ratajczak, T.Walkinshaw, M.D.

(2001) Structure 9: 431-438

  • DOI: https://doi.org/10.1016/s0969-2126(01)00603-7
  • Primary Citation of Related Structures:  
    1IHG, 1IIP

  • PubMed Abstract: 

    The "large immunophilin" family consists of domains of cyclophilin or FK506 binding protein linked to a tetratricopeptide (TPR) domain. They are intimately associated with steroid receptor complexes and bind to the C-terminal domain of Hsp90 via the TPR domain. The competitive binding of specific large immunophilins and other TPR-Hsp90 proteins provides a regulatory mechanism for Hsp90 chaperone activity. We have solved the X-ray structures of monoclinic and tetragonal forms of Cyp40. In the monoclinic form, the TPR domain consists of seven helices of variable length incorporating three TPR motifs, which provide a convincing binding surface for the Hsp90 C-terminal MEEVD sequence. The C-terminal residues of Cyp40 protrude out beyond the body of the TPR domain to form a charged helix-the putative calmodulin binding site. However, in the tetragonal form, two of the TPR helices have straightened out to form one extended helix, providing a dramatically different conformation of the molecule. The X-ray structures are consistent with the role of Cyclophilin 40 as a multifunctional signaling protein involved in a variety of protein-protein interactions. The intermolecular helix-helix interactions in the tetragonal form mimic the intramolecular interactions found in the fully folded monoclinic form. These conserved intra- and intermolecular TPR-TPR interactions are illustrative of a high-fidelity recognition mechanism. The two structures also open up the possibility that partially folded forms of TPR may be important in domain swapping and protein recognition.

  • Organizational Affiliation

    Structural Biochemistry Group, Institute of Cell and Molecular Biology, The University of Edinburgh, Michael Swann Building, King's Buildings, Mayfield Road, EH9 3JR, Edinburgh, United Kingdom.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Cyclophilin 40370Bos taurusMutation(s): 0 
Find proteins for P26882 (Bos taurus)
Explore P26882 
Go to UniProtKB:  P26882
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP26882
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on GOL

Download Ideal Coordinates CCD File 
C3 H8 O3
Experimental Data & Validation

Experimental Data

  • Resolution: 2.00 Å
  • R-Value Free: 0.305 
  • R-Value Work: 0.236 
  • R-Value Observed: 0.236 
  • Space Group: P 42 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 94.585α = 90
b = 94.585β = 90
c = 118.326γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2001-05-16
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance
  • Version 1.3: 2024-04-03
    Changes: Data collection, Database references, Derived calculations, Refinement description