1CWB

THE X-RAY STRUCTURE OF (MEBM2T)1-CYCLOSPORIN COMPLEXED WITH CYCLOPHILIN A PROVIDES AN EXPLANATION FOR ITS ANOMALOUSLY HIGH IMMUNOSUPPRESSIVE ACTIVITY


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Work: 0.162 

wwPDB Validation 3D Report Full Report


This is version 1.4 of the entry. See complete history

Literature

The X-Ray Structure of (Mebm2T)1-Cyclosporin Complexed with Cyclophilin a Provides an Explanation for its Anomalously High Immunosuppressive Activity.

Mikol, V.Kallen, J.Walkinshaw, M.D.

(1994) Protein Eng. 7: 597

  • Also Cited By: 1CWA, 1CWC

  • PubMed Abstract: 
  • For most of the cyclosporin A (CsA) analogs, there is generally a good correlation between cyclophilin binding and immunosuppression. However, this relationship does not seem to hold for 4-[(E)-2-butenyl]-4,4,N-trimethyl-L-threonine1 (MeBm2t)1-CsA. I ...

    For most of the cyclosporin A (CsA) analogs, there is generally a good correlation between cyclophilin binding and immunosuppression. However, this relationship does not seem to hold for 4-[(E)-2-butenyl]-4,4,N-trimethyl-L-threonine1 (MeBm2t)1-CsA. Its affinity for cyclophilin was reported to be approximately 1% that of CsA and its immunosuppressive activity in vitro was shown to be approximately 30% that of CsA. We report here the crystal structure of a complex between recombinant human cyclophilin A (CypA) and (MeBm2t)1-CsA which has been determined by X-ray crystallography at 2.2 A resolution and refined to an R-factor of 16.3%. (MeBm2t)1-CsA shows a similar bound conformation and network of interactions to CypA as CsA. The measured lower affinity for CypA cannot therefore be explained by a different mode of binding. We propose that the poor affinity to CypA could be accounted for by the existence of an equilibrium in aqueous solution between a 'cyclophilin bound conformation' and a 'non-binding conformation' of (MeBm2t)1-CsA. The relatively high immunosuppressive activity is suggested to result from slight conformational differences observed in the effector domain.


    Related Citations: 
    • X-Ray Structure of a Decameric Cyclophilin- Cyclosporin Crystal Complex.
      Pflugl, G.,Kallen, J.,Schirmer, T.,Jansonius, J.N.,Zurini, M.G.,Walkinshaw, M.D.
      (1993) Nature 361: 91
    • Crystallization of the Complex between Cyclophilin a and Cyclosporin Derivatives: The Use of Cross- Seeding.
      Mikol, V.,Duc, D.
      (1994) Acta Crystallogr.,Sect.D 50: 543
    • X-Ray Structure of a Monomeric Cyclophilin A- Cyclosporin a Crystal Complex at 2.1 A Resolution.
      Mikol, V.,Kallen, J.,Pflugl, G.,Walkinshaw, M.D.
      (1993) J.Mol.Biol. 234: 1119
    • Improved Binding Affinity for Cyclophilin a by a Cyclosporin Derivative Singly Modified at its Effector Domain.
      Papageorgiou, C.,Florineth, A.,Mikol, V.
      (1994) J.Med.Chem. 37: 3674


    Organizational Affiliation

    Sandoz AG, Basle, Switzerland.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PEPTIDYL-PROLYL CIS-TRANS ISOMERASE A
A
165Homo sapiensGene Names: PPIA (CYPA)
EC: 5.2.1.8
Find proteins for P62937 (Homo sapiens)
Go to Gene View: PPIA
Go to UniProtKB:  P62937
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
CYCLOSPORIN A
C
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_000765
Query on PRD_000765
CCYCLOSPORIN A, 5 mutationCyclic peptide / Immunosuppressant

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Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Work: 0.162 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 36.869α = 90.00
b = 61.292β = 90.00
c = 71.993γ = 90.00
Software Package:
Software NamePurpose
X-PLORmodel building
X-PLORrefinement
X-PLORphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1996-01-29
    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