Biological Assembly 1  

 3D View: Structure | Electron Density

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 3-mer - A1BC 

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

Macromolecule Content

• Total Structure Weight: 30.59 kDa 
• Atom Count: 2184 
• Residue Count: 266 
• Unique protein chains: 2

3UQ3

TPR2AB-domain:pHSP90-complex of yeast Sti1

• DOI: 10.2210/pdb3UQ3/pdb

• Classification: CHAPERONE
• Organism(s): Saccharomyces cerevisiae S288C
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2011-11-19 Released: 2012-01-18 
• Deposition Author(s): Schmid, A.B., Lagleder, S., Graewert, M.A., Roehl, A., Hagn, F., Wandinger, S.K., Cox, M.B., Demmer, O., Richter, K., Groll, M., Kessler, H., Buchner, J.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.60 Å
• R-Value Free: 0.279 
• R-Value Work: 0.217 
• R-Value Observed: 0.220 

Literature

The architecture of functional modules in the Hsp90 co-chaperone Sti1/Hop.

Schmid, A.B., Lagleder, S., Grawert, M.A., Rohl, A., Hagn, F., Wandinger, S.K., Cox, M.B., Demmer, O., Richter, K., Groll, M., Kessler, H., Buchner, J.

(2012) EMBO J 31: 1506-1517

• PubMed: 22227520 
• DOI: 10.1038/emboj.2011.472
• Structures With Same Primary Citation


• PubMed Abstract: 
  

Sti1/Hop is a modular protein required for the transfer of client proteins from the Hsp70 to the Hsp90 chaperone system in eukaryotes. It binds Hsp70 and Hsp90 simultaneously via TPR (tetratricopeptide repeat) domains. Sti1/Hop contains three TPR domains (TPR1, TPR2A and TPR2B) and two domains of unknown structure (DP1 and DP2). We show that TPR2A is the high affinity Hsp90-binding site and TPR1 and TPR2B bind Hsp70 with moderate affinity. The DP domains exhibit highly homologous α-helical folds as determined by NMR. These, and especially DP2, are important for client activation in vivo. The core module of Sti1 for Hsp90 inhibition is the TPR2A-TPR2B segment. In the crystal structure, the two TPR domains are connected via a rigid linker orienting their peptide-binding sites in opposite directions and allowing the simultaneous binding of TPR2A to the Hsp90 C-terminal domain and of TPR2B to Hsp70. Both domains also interact with the Hsp90 middle domain. The accessory TPR1-DP1 module may serve as an Hsp70-client delivery system for the TPR2A-TPR2B-DP2 segment, which is required for client activation in vivo.

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Organizational Affiliation: 

Department Chemie, Center for Integrated Protein Science (CIPSM), Technische Universität München, Garching, Germany.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Heat shock protein STI1	A	258	Saccharomyces cerevisiae S288C	Mutation(s): 0  Gene Names: STI1, YOR027W, OR26.17
Find proteins for P15705 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c)) Go to UniProtKB:  P15705

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details
Heat shock protein	B, C	5	Saccharomyces cerevisiae S288C	Mutation(s): 0
Protein Feature View is not available: No corresponding UniProt sequence found.

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.60 Å
• R-Value Free: 0.279 
• R-Value Work: 0.217 
• R-Value Observed: 0.220 
• Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 43.191	α = 90
b = 62.897	β = 95.8
c = 66.842	γ = 90

Software Package:

Software Name	Purpose
PROTEUM2	data collection
PHASER	phasing
REFMAC	refinement
PROTEUM2	data reduction
PROTEUM2	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2011-11-19 
• Released Date: 2012-01-18 
Deposition Author(s): Schmid, A.B., Lagleder, S., Graewert, M.A., Roehl, A., Hagn, F., Wandinger, S.K., Cox, M.B., Demmer, O., Richter, K., Groll, M., Kessler, H., Buchner, J.

Revision History 

• Version 1.0: 2012-01-18
  Type: Initial release
  
• Version 1.1: 2012-01-25
  Changes: Database references
• Version 1.2: 2012-04-04
  Changes: Database references