Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Cyclic - C7  (3D View)
Global Stoichiometry: Hetero 21-mer - A14B7 Pseudo Symmetry: Cyclic - C7  (3D View)
Pseudo Stoichiometry: Hetero 21-mer - A7BC 

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

Macromolecule Content

• Total Structure Weight: 877.61 kDa 
• Atom Count: 58870 
• Residue Count: 8015 
• Unique protein chains: 2

1AON

CRYSTAL STRUCTURE OF THE ASYMMETRIC CHAPERONIN COMPLEX GROEL/GROES/(ADP)7

• DOI: 10.2210/pdb1AON/pdb

• Classification: COMPLEX (GROEL/GROES)
• Organism(s): Escherichia coli
• Expression System: Escherichia coli, Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 1997-07-08 Released: 1997-10-15 
• Deposition Author(s): Xu, Z., Horwich, A.L., Sigler, P.B.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 3.00 Å
• R-Value Free: 0.291 
• R-Value Work: 0.248 
• R-Value Observed: 0.248 

Literature

The crystal structure of the asymmetric GroEL-GroES-(ADP)7 chaperonin complex.

Xu, Z., Horwich, A.L., Sigler, P.B.

(1997) Nature 388: 741-750

• PubMed: 9285585 
• DOI: 10.1038/41944
• Structures With Same Primary Citation


• PubMed Abstract: 
  

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.

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Related Citations: 

• Distinct Actions of Cis and Trans ATP within the Double Ring of the Chaperonin Groel
  Rye, H.S., Burston, S.G., Fenton, W.A., Beechem, J.M., Xu, Z., Sigler, P.B., Horwich, A.L.
  (1997) Nature 388: 792

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Organizational Affiliation: 

The Howard Hughes Medical Institute, The Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, Connecticut 06510, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
GROEL	A, B, C, D, E, F, G, H, I, J, K, L, M, N	547	Escherichia coli	Mutation(s): 0  Gene Names: GROE
Find proteins for P0A6F5 (Escherichia coli (strain K12)) Go to UniProtKB:  P0A6F5

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details
GROEL/GROES COMPLEX	O, P, Q, R, S, T, U	97	Escherichia coli	Mutation(s): 0  Gene Names: GROE
Find proteins for P0A6F9 (Escherichia coli (strain K12)) Go to UniProtKB:  P0A6F9

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
ADP	A, B, C, D, E, F, G	ADENOSINE-5'-DIPHOSPHATE C10 H15 N5 O10 P2 XTWYTFMLZFPYCI-KQYNXXCUSA-N
MG	A, B, C, D, E, F, G	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 3.00 Å
• R-Value Free: 0.291 
• R-Value Work: 0.248 
• R-Value Observed: 0.248 
• Space Group: P 2₁ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 255.26	α = 90
b = 265.25	β = 90
c = 184.4	γ = 90

Software Package:

Software Name	Purpose
X-PLOR	model building
X-PLOR	refinement
DENZO	data reduction
SCALEPACK	data scaling
X-PLOR	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1997-07-08 
• Released Date: 1997-10-15 
Deposition Author(s): Xu, Z., Horwich, A.L., Sigler, P.B.

Revision History 

• Version 1.0: 1997-10-15
  Type: Initial release
  
• Version 1.1: 2008-03-24
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance