1CYB

NMR STUDIES OF (U-13C)CYCLOSPORIN A BOUND TO CYCLOPHILIN: BOUND CONFORMATION AND PORTIONS OF CYCLOSPORIN INVOLVED IN BINDING


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Submitted: 20 

wwPDB Validation 3D Report Full Report


This is version 1.4 of the entry. See complete history

Literature

NMR Studies of [U-13C]Cyclosporin a Bound to Cyclophilin: Bound Conformation and Portions of Cyclosporin Involved in Binding.

Fesik, S.W.Gampe, R.T.Eaton, H.L.Gemmecker, G.Olejniczak, E.T.Neri, P.Holzman, T.F.Egan, D.A.Edalji, R.

(1991) Biochemistry 30: 6574

  • Primary Citation of Related Structures:  1CYA

  • PubMed Abstract: 
  • Cyclosporin A (CsA), a potent immunosuppressant, is known to bind with high specificity to cyclophilin (CyP), a 17.7 kDa protein with peptidyl-prolyl isomerase activity. In order to investigate the three-dimensional structure of the CsA/CyP complex, ...

    Cyclosporin A (CsA), a potent immunosuppressant, is known to bind with high specificity to cyclophilin (CyP), a 17.7 kDa protein with peptidyl-prolyl isomerase activity. In order to investigate the three-dimensional structure of the CsA/CyP complex, we have applied a variety of multidimensional NMR methods in the study of uniformly 13C-labeled CsA bound to cyclophilin. The 1H and 13C NMR signals of cyclosporin A in the bound state have been assigned, and from a quantitative interpretation of the 3D NOE data, the bound conformation of CsA has been determined. Three-dimensional structures of CsA calculated from the NOE data by using a distance geometry/simulated appealing protocol were found to be very different from previously determined crystalline and solution conformations of uncomplexed CsA. In addition, from CsA/CyP NOEs, the portions of CsA that interact with cyclophilin were identified. For the most part, those CsA residues with NOEs to cyclophilin were the same residues important for cyclophilin binding and immunosuppressive activity as determined from structure/activity relationships. The structural information derived in this study together with the known structure/activity relationships for CsA analogues may prove useful in the design of improved immunosuppressants. Moreover, the approach that is described for obtaining the structural information is widely applicable to the study of small molecule/large molecule interactions.


    Related Citations: 
    • 1H, 13C and 15N Backbone Assignments of Cyclophilin When Bound to Cyclosporin a (Csa) and Preliminary Structural Characterization of the Csa Binding Site
      Neri, P.,Meadows, R.,Gemmecker, G.,Olejniczak, E.,Nettesheim, D.,Logan, T.,Simmer, R.,Helfrich, R.,Holzman, T.,Severin, J.,Fesik, S.
      (1991) FEBS Lett. 294: 81
    • Identification of Solvent-Exposed Regions of Enzyme-Bound Ligands by Nuclear Magnetic Resonance
      Fesik, S.W.,Gemmecker, G.,Olejniczak, E.T.,Petros, A.M.
      (1991) J.Am.Chem.Soc. 113: 7080


    Organizational Affiliation

    Pharmaceutical Discovery Division, Abbott Laboratories, Abbott Park, Illinois 60064.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
CYCLOSPORIN A
A
11N/AN/A
Protein Feature View is not available: No corresponding UniProt sequence found.
Small Molecules
Biologically Interesting Molecules 1 Unique
IDChainsNameType/Class2D Diagram3D Interactions
PRD_000142
Query on PRD_000142
ACyclosporin ACyclic peptide / Immunosuppressant

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Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Submitted: 20 
Software Package:
Software NamePurpose
X-PLORmodel building
X-PLORphasing
X-PLORrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 1992-02-24 
  • Released Date: 1994-01-31 
  • Deposition Author(s): Fesik, S.W.

Revision History 

  • Version 1.0: 1994-01-31
    Type: Initial release
  • Version 1.1: 2011-06-14
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2011-07-27
    Type: Atomic model, Database references, Derived calculations, Non-polymer description, Structure summary
  • Version 1.4: 2012-12-12
    Type: Other