Biological Assembly 1  

 3D View: Structure

Biological assembly 1 assigned by authors and generated by PQS (software)

Macromolecule Content

• Total Structure Weight: 1.22 kDa 
• Atom Count: 85 
• Modelled Residue Count: 11 
• Deposited Residue Count: 11 
• Unique protein chains: 1

1CSA

THE MUTANT E.COLI F112W CYCLOPHILIN BINDS CYCLOSPORIN A IN NEARLY IDENTICAL CONFORMATION AS HUMAN CYCLOPHILIN

• DOI: 10.2210/pdb1CSA/pdb

• Classification: IMMUNOSUPPRESSANT
• Organism(s): Tolypocladium inflatum
• Mutation(s): No 


• Deposited: 1992-02-24 Released: 1994-04-30 
• Deposition Author(s): Fejzo, J., Walsh, C.T., Wagner, G.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Submitted: 18 

Literature

The Mutant Escherichia Coli F112W Cyclophilin Binds Cyclosporin a in Nearly Identical Conformation as Human Cyclophilin.

Fejzo, J., Etzkorn, F.A., Clubb, R.T., Shi, Y., Walsh, C.T., Wagner, G.

(1994) Biochemistry 33: 5711

• PubMed: 8180197 
• DOI: 10.1021/bi00185a007
• Primary Citation of Related Structures:  
  1CSA


• PubMed Abstract: 
  

The periplasmic Escherichia coli cyclophilin is distantly related to human cyclophilin (34% sequence identity). Peptidyl-prolyl isomerase activity, cyclosporin A binding, and inhibition of the calcium-dependent phosphatase calcineurin are compared for human and E. coli wild-type and mutant proteins. Like human cyclophilin, the E. coli protein is a cis-trans peptidyl-prolyl isomerase. However, while the human protein binds cyclosporin A tightly (Kd = 17 nM), the E. coli protein does not (Kd = 3.4 microM). The mutant F112W E. coli cyclophilin has enhanced cyclosporin binding (Kd = 170 nM). As for the human protein, the complex of the E. coli mutant with cyclosporin A inhibits calcineurin. Here we describe the structure at pH 6.2 of cyclosporin A bound to the mutant E. coli cyclophilin as solved with solution NMR methods. Despite the low overall sequence identity, the structure of the bound cyclosporin A is virtually identical in both proteins. To assess differences of the cyclosporin binding site, the solution structure of wild-type E. coli cyclophilin was compared with structures of uncomplexed human cyclophilin A and with cyclosporin bound. Despite the structural similarity of bound cyclosporin A, the architecture of the binding site in the E. coli protein is substantially different at the site most distant to tryptophan 121 (human sequence). This site is constructed by a five-residue insertion in a loop of the E. coli protein, replacing another loop in the human protein.

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Related Citations: 

• Three-Dimensional Solution Structure of Escherichia Coli Periplasmic Cyclophilin.
  Clubb, R.T., Ferguson, S.B., Walsh, C.T., Wagner, G.
  (1994) Biochemistry 33: 2761

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Organizational Affiliation: 

Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, Massachusetts 02115.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
CYCLOSPORIN A	A	11	Tolypocladium inflatum	Mutation(s): 0

Small Molecules

Modified Residues  5 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
ABA	A	L-PEPTIDE LINKING	C4 H9 N O2		ALA
BMT	A	L-PEPTIDE LINKING	C10 H19 N O3		THR
MLE	A	L-PEPTIDE LINKING	C7 H15 N O2		LEU
MVA	A	L-PEPTIDE LINKING	C6 H13 N O2		VAL
SAR	A	PEPTIDE LINKING	C3 H7 N O2		GLY

Biologically Interesting Molecules (External Reference) 1 Unique

Entity ID: 1
ID	Chains	Name	Type/Class	2D Diagram	3D Interactions
PRD_000142	A	Cyclosporin A	Cyclic peptide /  Immunosuppressant		Ligand Interaction

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Submitted: 18 
• OLDERADO: 1CSA Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1992-02-24 
• Released Date: 1994-04-30 
Deposition Author(s): Fejzo, J., Walsh, C.T., Wagner, G.

Revision History  

• Version 1.0: 1994-04-30
  Type: Initial release
  
• Version 1.1: 2011-06-14
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2011-07-27
  Changes: Atomic model, Database references, Derived calculations, Non-polymer description, Structure summary
• Version 1.4: 2012-12-12
  Changes: Other