3SZ7

Crystal structure of the Sgt2 TPR domain from Aspergillus fumigatus


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.72 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.169 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

A structural model of the Sgt2 protein and its interactions with chaperones and the Get4/Get5 complex.

Chartron, J.W.Gonzalez, G.M.Clemons, W.M.

(2011) J.Biol.Chem. 286: 34325-34334

  • DOI: 10.1074/jbc.M111.277798

  • PubMed Abstract: 
  • The insertion of tail-anchored transmembrane (TA) proteins into the appropriate membrane is a post-translational event that requires stabilization of the transmembrane domain and targeting to the proper destination. Sgt2 is a heat-shock protein cogna ...

    The insertion of tail-anchored transmembrane (TA) proteins into the appropriate membrane is a post-translational event that requires stabilization of the transmembrane domain and targeting to the proper destination. Sgt2 is a heat-shock protein cognate (HSC) co-chaperone that preferentially binds endoplasmic reticulum-destined TA proteins and directs them to the GET pathway via Get4 and Get5. Here, we present the crystal structure from a fungal Sgt2 homolog of the tetratrico-repeat (TPR) domain and part of the linker that connects to the C-terminal domain. The linker extends into the two-carboxylate clamp of the TPR domain from a symmetry-related molecule mimicking the binding to HSCs. Based on this structure, we provide biochemical evidence that the Sgt2 TPR domain has the ability to directly bind multiple HSC family members. The structure allows us to propose features involved in this lower specificity relative to other TPR containing co-chaperones. We further show that a dimer of Sgt2 binds a single Get5 and use small angle x-ray scattering to characterize the domain arrangement of Sgt2 in solution. These results allow us to present a structural model of the Sgt2-Get4/Get5-HSC complex.


    Organizational Affiliation

    Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Hsc70 cochaperone (SGT)
A
164Neosartorya fumigata (strain ATCC MYA-4609 / Af293 / CBS 101355 / FGSC A1100)EC: 3.1.3.16
Find proteins for Q4WTC0 (Neosartorya fumigata (strain ATCC MYA-4609 / Af293 / CBS 101355 / FGSC A1100))
Go to UniProtKB:  Q4WTC0
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.72 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.169 
  • Space Group: F 2 2 2
Unit Cell:
Length (Å)Angle (°)
a = 59.610α = 90.00
b = 86.770β = 90.00
c = 116.540γ = 90.00
Software Package:
Software NamePurpose
MOSFLMdata reduction
Blu-Icedata collection
PDB_EXTRACTdata extraction
PHASERphasing
SCALAdata scaling
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-08-10
    Type: Initial release
  • Version 1.1: 2012-08-29
    Type: Database references