Biological Assembly 1  

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Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A 

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

Macromolecule Content

• Total Structure Weight: 30588.15 
• Atom Count: 2132 
• Residue Count: 268 
• Unique protein chains: 2

3UQ3

TPR2AB-domain:pHSP90-complex of yeast Sti1

• DOI: 10.2210/pdb3UQ3/pdb

• Classification: CHAPERONE
• Organism(s): Homo sapiens, Saccharomyces cerevisiae (strain ATCC 204508 / S288c)
• Expression System: Escherichia coli BL21(DE3)


• 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: 2.6 Å
• R-Value Free: 0.279 
• R-Value Work: 0.217 

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
• Primary Citation of Related Structures:  
  3UPV, 2LLW, 2LLV


• 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

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Heat shock protein STI1	A	258	Saccharomyces cerevisiae (strain ATCC 204508 / S288c)	Mutation(s): 0  Gene Names: STI1
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	Homo sapiens	Mutation(s): 0  Gene Names: HSP90AB1 (HSP90B, HSPC2, HSPCB)
Find proteins for P08238 (Homo sapiens) Go to Gene View: HSP90AB1 Go to UniProtKB:  P08238

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.6 Å
• R-Value Free: 0.279 
• R-Value Work: 0.217 
• Space Group: P 1 2₁ 1

Unit Cell:

Length (Å)	Angle (°)
a = 43.191	α = 90.00
b = 62.897	β = 95.80
c = 66.842	γ = 90.00

Software Package:

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

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
  Type: Database references
• Version 1.2: 2012-04-04
  Type: Database references