Biological Assembly 1  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Hetero 6-mer - A2B2C2 Pseudo Symmetry: Cyclic - C2  (3D View)
Pseudo Stoichiometry: Hetero 6-mer - A4B2 

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

Macromolecule Content

• Total Structure Weight: 48.99 kDa 
• Atom Count: 3492 
• Modelled Residue Count: 396 
• Deposited Residue Count: 450 
• Unique protein chains: 2

3ZDM

Crystal structure of the Sgt2 N domain and the Get5 UBL domain complex

• PDB DOI: 10.2210/pdb3ZDM/pdb

• Classification: CHAPERONE/SIGNALING PROTEIN
• Organism(s): Saccharomyces cerevisiae
• Expression System: Escherichia coli BL21
• Mutation(s): No 


• Deposited: 2012-11-29 Released: 2013-10-02 
• Deposition Author(s): Tung, J.-Y., Li, Y.-C., Hsiao, C.-D.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.80 Å
• R-Value Free: 0.226 
• R-Value Work: 0.187 
• R-Value Observed: 0.189 

Literature

Structure of the Sgt2 Dimerization Domain Complexed with the Get5 Ubl Domain Involved in the Targeting of Tail-Anchored Membrane Proteins to the Endoplasmic Reticulum.

Tung, J.-Y., Li, Y.-C., Lin, T.-W., Hsiao, C.-D.

(2013) Acta Crystallogr D Biol Crystallogr 69: 2081

• PubMed: 24100326 
• DOI: 10.1107/S0907444913019379
• Primary Citation of Related Structures:  
  3ZDM


• PubMed Abstract: 
  

The insertion of tail-anchored membrane (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, a small glutamine-rich tetratricopeptide-repeat protein, 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. The N-terminal domain of Sgt2 seems to exert dual functions. It mediates Get5 interaction and allows substrate delivery to Get3. Following the N-terminus of Get5 is a ubiquitin-like (Ubl) domain that interacts with the N-terminus of Sgt2. Here, the crystal structure of the Sgt2 dimerization domain complexed with the Get5 Ubl domain (Sgt2N-Get5Ubl) is reported. This complex reveals an intimate interaction between one Sgt2 dimer and one Get5 monomer. This research further demonstrates that hydrophobic residues from both Sgt2 and Get5 play an important role in cell survival under heat stress. This study provides detailed molecular insights into the specific binding of this GET-pathway complex.

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Organizational Affiliation: 

Institute of Molecular Biology, Academia Sinica, Taipei 115, Taiwan.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
SMALL GLUTAMINE-RICH TETRATRICOPEPTIDE REPEAT- CONTAINING PROTEIN 2	A, B, D, E	72	Saccharomyces cerevisiae	Mutation(s): 0
UniProt
Find proteins for Q12118 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c)) Explore Q12118  Go to UniProtKB:  Q12118

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
UBIQUITIN-LIKE PROTEIN MDY2	C, F	81	Saccharomyces cerevisiae	Mutation(s): 0
UniProt
Find proteins for Q12285 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c)) Explore Q12285  Go to UniProtKB:  Q12285

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.80 Å
• R-Value Free: 0.226 
• R-Value Work: 0.187 
• R-Value Observed: 0.189 
• Space Group: C 1 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 137.109	α = 90
b = 34.127	β = 105.84
c = 92.092	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
HKL-2000	data reduction
HKL-2000	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2012-11-29 
• Released Date: 2013-10-02 
Deposition Author(s): Tung, J.-Y., Li, Y.-C., Hsiao, C.-D.

Revision History  

• Version 1.0: 2013-10-02
  Type: Initial release
  
• Version 1.1: 2013-10-16
  Changes: Database references