3ICH

Crystal structure of cyclophilin B at 1.2 A resolution


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.2 Å
  • R-Value Free: 0.162 
  • R-Value Work: 0.143 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structural Basis of Cyclophilin B Binding by the Calnexin/Calreticulin P-domain.

Kozlov, G.Bastos-Aristizabal, S.Maattanen, P.Rosenauer, A.Zheng, F.Killikelly, A.Trempe, J.F.Thomas, D.Y.Gehring, K.

(2010) J.Biol.Chem. 285: 35551-35557

  • DOI: 10.1074/jbc.M110.160101
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Little is known about how chaperones in the endoplasmic reticulum are organized into complexes to assist in the proper folding of secreted proteins. One notable exception is the complex of ERp57 and calnexin that functions as part the calnexin cycle ...

    Little is known about how chaperones in the endoplasmic reticulum are organized into complexes to assist in the proper folding of secreted proteins. One notable exception is the complex of ERp57 and calnexin that functions as part the calnexin cycle to direct disulfide bond formation in N-glycoproteins. Here, we report three new complexes composed of the peptidyl prolyl cis-trans-isomerase cyclophilin B and any of the lectin chaperones: calnexin, calreticulin, or calmegin. The 1.7 Å crystal structure of cyclophilin with the proline-rich P-domain of calmegin reveals that binding is mediated by the same surface that binds ERp57. We used NMR titrations and mutagenesis to measure low micromolar binding of cyclophilin to all three lectin chaperones and identify essential interfacial residues. The immunosuppressant cyclosporin A did not affect complex formation, confirming the functional independence of the P-domain binding and proline isomerization sites of cyclophilin. Our results reveal the P-domain functions as a unique protein-protein interaction domain and implicate a peptidyl prolyl isomerase as a new element in the calnexin cycle.


    Organizational Affiliation

    Department of Biochemistry and Groupe de Recherche Axé sur la Structure des Protéines, McGill University, Montréal, Québec H3G 0B1, Canada.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Peptidyl-prolyl cis-trans isomerase B
A
188Homo sapiensMutation(s): 0 
Gene Names: PPIB (CYPB)
EC: 5.2.1.8
Find proteins for P23284 (Homo sapiens)
Go to Gene View: PPIB
Go to UniProtKB:  P23284
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.2 Å
  • R-Value Free: 0.162 
  • R-Value Work: 0.143 
  • Space Group: P 32
Unit Cell:
Length (Å)Angle (°)
a = 64.665α = 90.00
b = 64.665β = 90.00
c = 39.463γ = 120.00
Software Package:
Software NamePurpose
REFMACrefinement
ADSCdata collection
HKL-2000data reduction
HKL-2000data scaling
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-07-21
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance