Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Cyclic - C3  (3D View)
Global Stoichiometry: Homo 3-mer - A3 

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

Biological Assembly 2  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Cyclic - C3  (3D View)
Global Stoichiometry: Homo 3-mer - A3 

Biological assembly 2 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 187.38 kDa 
• Atom Count: 12617 
• Modelled Residue Count: 1531 
• Deposited Residue Count: 1650 
• Unique protein chains: 1

3GW6

Intramolecular Chaperone

• DOI: 10.2210/pdb3GW6/pdb

• Classification: CHAPERONE
• Organism(s): Escherichia phage K1F
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2009-03-31 Released: 2010-02-02 
• Deposition Author(s): Schulz, E.C., Dickmanns, A., Ficner, R.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.60 Å
• R-Value Free: 0.255 
• R-Value Work: 0.209 
• R-Value Observed: 0.211 

Literature

Crystal structure of an intramolecular chaperone mediating triple-beta-helix folding.

Schulz, E.C., Dickmanns, A., Urlaub, H., Schmitt, A., Muhlenhoff, M., Stummeyer, K., Schwarzer, D., Gerardy-Schahn, R., Ficner, R.

(2010) Nat Struct Mol Biol 17: 210-215

• PubMed: 20118935 
• DOI: 10.1038/nsmb.1746
• Primary Citation of Related Structures:  
  3GUD, 3GW6


• PubMed Abstract: 
  

Protein folding is often mediated by molecular chaperones. Recently, a novel class of intramolecular chaperones has been identified in tailspike proteins of evolutionarily distant viruses, which require a C-terminal chaperone for correct folding. The highly homologous chaperone domains are interchangeable between pre-proteins and release themselves after protein folding. Here we report the crystal structures of two intramolecular chaperone domains in either the released or the pre-cleaved form, revealing the role of the chaperone domain in the formation of a triple-beta-helix fold. Tentacle-like protrusions enclose the polypeptide chains of the pre-protein during the folding process. After the assembly, a sensory mechanism for correctly folded beta-helices triggers a serine-lysine catalytic dyad to autoproteolytically release the mature protein. Sequence analysis shows a conservation of the intramolecular chaperones in functionally unrelated proteins sharing beta-helices as a common structural motif.

---

Organizational Affiliation: 

Abteilung für Molekulare Strukturbiologie, Institut für Mikrobiologie und Genetik, Georg-August-Universität Göttingen, Göttingen, Germany.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Endo-N-acetylneuraminidase	A, B, D [auth C], E [auth D], C [auth E], F	275	Escherichia phage K1F	Mutation(s): 0  Gene Names: sia, 17, 17.0 EC: 3.2.1.129
Find proteins for Q04830 (Escherichia phage K1F) Explore Q04830  Go to UniProtKB:  Q04830

Small Molecules

Ligands 5 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
TAM	DA [auth C], I [auth A], J [auth A]	TRIS(HYDROXYETHYL)AMINOMETHANE C7 H17 N O3 GKODZWOPPOTFGA-UHFFFAOYSA-N
PEG	CA [auth C],  EA [auth C],  G [auth A],  GA [auth D],  H [auth A],  JA [auth F],  KA [auth F],  LA [auth F],  M [auth B],  MA [auth F],  P [auth E],  Q [auth E],  R [auth E],  S [auth E],  T [auth E],  U [auth E],  V [auth E],  Y [auth C]	DI(HYDROXYETHYL)ETHER C4 H10 O3 MTHSVFCYNBDYFN-UHFFFAOYSA-N
BR	L [auth B], N [auth B], NA [auth F], O [auth B], W [auth E], Z [auth C]	BROMIDE ION Br CPELXLSAUQHCOX-UHFFFAOYSA-M
CA	IA [auth F]	CALCIUM ION Ca BHPQYMZQTOCNFJ-UHFFFAOYSA-N
CL	AA [auth C], BA [auth C], FA [auth D], HA [auth D], K [auth A], X [auth E]	CHLORIDE ION Cl VEXZGXHMUGYJMC-UHFFFAOYSA-M

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.60 Å
• R-Value Free: 0.255 
• R-Value Work: 0.209 
• R-Value Observed: 0.211 
• Space Group: P 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 62.65	α = 81.71
b = 79.95	β = 76.53
c = 109.58	γ = 87.11

Software Package:

Software Name	Purpose
XSCALE	data processing
PHENIX	refinement
PDB_EXTRACT	data extraction
MAR345dtb	data collection
XDS	data reduction
XSCALE	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2009-03-31 
• Released Date: 2010-02-02 
Deposition Author(s): Schulz, E.C., Dickmanns, A., Ficner, R.

Revision History  

• Version 1.0: 2010-02-02
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Version format compliance