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1aon, resolution 3.00Å ()
Ligands: ,
Gene: GROE (Escherichia coli)
Resources: FirstGlance, OCA, PDBsum, RCSB
Coordinates: save as pdb, mmCIF, xml



Publication Abstract from PubMed

Chaperonins assist protein folding with the consumption of ATP. They exist as multi-subunit protein assemblies comprising rings of subunits stacked back to back. In Escherichia coli, asymmetric intermediates of GroEL are formed with the co-chaperonin GroES and nucleotides bound only to one of the seven-subunit rings (the cis ring) and not to the opposing ring (the trans ring). The structure of the GroEL-GroES-(ADP)7 complex reveals how large en bloc movements of the cis ring's intermediate and apical domains enable bound GroES to stabilize a folding chamber with ADP confined to the cis ring. Elevation and twist of the apical domains double the volume of the central cavity and bury hydrophobic peptide-binding residues in the interface with GroES, as well as between GroEL subunits, leaving a hydrophilic cavity lining that is conducive to protein folding. An inward tilt of the cis equatorial domain causes an outward tilt in the trans ring that opposes the binding of a second GroES. When combined with new functional results, this negative allosteric mechanism suggests a model for an ATP-driven folding cycle that requires a double toroid.

The crystal structure of the asymmetric GroEL-GroES-(ADP)7 chaperonin complex., Xu Z, Horwich AL, Sigler PB, Nature. 1997 Aug 21;388(6644):741-50. PMID:9285585

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

About this Structure

1aon is a 21 chain structure with sequence from Escherichia coli. The August 2002 RCSB PDB Molecule of the Month feature on Chaperones by David S. Goodsell is 10.2210/rcsb_pdb/mom_2002_8. Full crystallographic information is available from OCA.

See Also


  • Xu Z, Horwich AL, Sigler PB. The crystal structure of the asymmetric GroEL-GroES-(ADP)7 chaperonin complex. Nature. 1997 Aug 21;388(6644):741-50. PMID:9285585 doi:
  • Numoto N, Kita A, Miki K. Crystal structure of the Co-chaperonin Cpn10 from Thermus thermophilus HB8. Proteins. 2005 Feb 1;58(2):498-500. PMID:15558581 doi:10.1002/prot.20317
  • Ranson NA, Clare DK, Farr GW, Houldershaw D, Horwich AL, Saibil HR. Allosteric signaling of ATP hydrolysis in GroEL-GroES complexes. Nat Struct Mol Biol. 2006 Feb;13(2):147-52. Epub 2006 Jan 22. PMID:16429154 doi:10.1038/nsmb1046

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