Biological Assembly 1  

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Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 36439.41 
• Atom Count: 2544 
• Residue Count: 330 
• Unique protein chains: 1

2X2A

Free acetyl-CypA trigonal form

• DOI: 10.2210/pdb2X2A/pdb

• Classification: ISOMERASE
• Organism(s): Homo sapiens


• Deposited: 2010-01-12 Released: 2010-03-23 
• Deposition Author(s): Lammers, M., Neumann, H., Chin, J.W., James, L.C.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.4 Å
• R-Value Free: 0.161 
• R-Value Work: 0.123 

Literature

Acetylation Regulates Cyclophilin a Catalysis, Immunosuppression and HIV Isomerization.

Lammers, M., Neumann, H., Chin, J.W., James, L.C.

(2010) Nat.Chem.Biol. 6: 331

• PubMed: 20364129 
• DOI: 10.1038/nchembio.342
• Primary Citation of Related Structures:  
  2X2C, 2X2D, 2X25


• PubMed Abstract: 
  

Cyclophilin A (CypA) is a ubiquitous cis-trans prolyl isomerase with key roles in immunity and viral infection. CypA suppresses T-cell activation through cyclosporine complexation and is required for effective HIV-1 replication in host cells. We show that CypA is acetylated in diverse human cell lines and use a synthetically evolved acetyllysyl-tRNA synthetase/tRNA(CUA) pair to produce recombinant acetylated CypA in Escherichia coli. We determined atomic-resolution structures of acetylated CypA and its complexes with cyclosporine and HIV-1 capsid. Acetylation markedly inhibited CypA catalysis of cis to trans isomerization and stabilized cis rather than trans forms of the HIV-1 capsid. Furthermore, CypA acetylation antagonized the immunosuppressive effects of cyclosporine by inhibiting the sequential steps of cyclosporine binding and calcineurin inhibition. Our results reveal that acetylation regulates key functions of CypA in immunity and viral infection and provide a general set of mechanisms by which acetylation modulates interactions to regulate cell function.

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Organizational Affiliation: 

Medical Research Council Laboratory of Molecular Biology, Protein and Nucleic Acid Chemistry Division, Cambridge, UK.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
PEPTIDYL-PROLYL CIS-TRANS ISOMERASE A	A, B	165	Homo sapiens	Mutation(s): 0  Gene Names: PPIA (CYPA) EC: 5.2.1.8
Find proteins for P62937 (Homo sapiens) Go to Gene View: PPIA Go to UniProtKB:  P62937

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
SO4	A, B	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L
GOL	A	GLYCEROL GLYCERIN; PROPANE-1,2,3-TRIOL C3 H8 O3 PEDCQBHIVMGVHV-UHFFFAOYSA-N

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
ALY	A, B	L-PEPTIDE LINKING	C8 H16 N2 O3		LYS

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.4 Å
• R-Value Free: 0.161 
• R-Value Work: 0.123 
• Space Group: P 3₂ 2 1

Unit Cell:

Length (Å)	Angle (°)
a = 64.300	α = 90.00
b = 64.300	β = 90.00
c = 173.900	γ = 120.00

Software Package:

Software Name	Purpose
REFMAC	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2010-01-12 
• Released Date: 2010-03-23 
• Deposition Author(s): Lammers, M., Neumann, H., Chin, J.W., James, L.C.

Revision History 

• Version 1.0: 2010-03-23
  Type: Initial release
• Version 1.1: 2011-06-09
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance