Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

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

Macromolecule Content

• Total Structure Weight: 11.71 kDa 
• Atom Count: 850 
• Residue Count: 93 
• Unique protein chains: 1

4GOD

Crystal structure of the SGTA homodimerization domain

• DOI: 10.2210/pdb4GOD/pdb

• Classification: PROTEIN BINDING
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2012-08-19 Released: 2012-11-21 
• Deposition Author(s): Chartron, J.W., VanderVelde, D.G., Clemons Jr., W.M.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.40 Å
• R-Value Free: 0.208 
• R-Value Work: 0.197 
• R-Value Observed: 0.197 

Literature

Structures of the Sgt2/SGTA Dimerization Domain with the Get5/UBL4A UBL Domain Reveal an Interaction that Forms a Conserved Dynamic Interface.

Chartron, J.W., Vandervelde, D.G., Clemons, W.M.

(2012) Cell Rep 2: 1620-1632

• PubMed: 23142665 
• DOI: 10.1016/j.celrep.2012.10.010
• Primary Citation of Related Structures:  
  4GOD, 4GOE, 4GOF, 4GOC, 2LXC, 2LXB, 2LXA


• PubMed Abstract: 
  

In the cytoplasm, the correct delivery of membrane proteins is an essential and highly regulated process. The posttranslational targeting of the important tail-anchor membrane (TA) proteins has recently been under intense investigation. A specialized pathway, called the guided entry of TA proteins (GET) pathway in yeast and the transmembrane domain recognition complex (TRC) pathway in vertebrates, recognizes endoplasmic-reticulum-targeted TA proteins and delivers them through a complex series of handoffs. An early step is the formation of a complex between Sgt2/SGTA, a cochaperone with a presumed ubiquitin-like-binding domain (UBD), and Get5/UBL4A, a ubiquitin-like domain (UBL)-containing protein. We structurally characterize this UBD/UBL interaction for both yeast and human proteins. This characterization is supported by biophysical studies that demonstrate that complex formation is mediated by electrostatics, generating an interface that has high-affinity with rapid kinetics. In total, this work provides a refined model of the interplay of Sgt2 homologs in TA targeting.

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Organizational Affiliation: 

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

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Small glutamine-rich tetratricopeptide repeat-containing protein alpha	A, B	52	Homo sapiens	Mutation(s): 0  Gene Names: SGT, SGT1, SGTA
Find proteins for O43765 (Homo sapiens) Explore O43765  Go to UniProtKB:  O43765
NIH Common Fund Data Resources
PHAROS:  O43765 GTEx:  ENSG00000104969

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
MPD	A	(4S)-2-METHYL-2,4-PENTANEDIOL C6 H14 O2 SVTBMSDMJJWYQN-YFKPBYRVSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.40 Å
• R-Value Free: 0.208 
• R-Value Work: 0.197 
• R-Value Observed: 0.197 
• Space Group: P 2 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 23.603	α = 90
b = 57.045	β = 90
c = 64.948	γ = 90

Software Package:

Software Name	Purpose
Blu-Ice	data collection
PHASER	phasing
PHENIX	refinement
XDS	data reduction
XDS	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2012-08-19 
• Released Date: 2012-11-21 
Deposition Author(s): Chartron, J.W., VanderVelde, D.G., Clemons Jr., W.M.

Revision History 

• Version 1.0: 2012-11-21
  Type: Initial release
  
• Version 1.1: 2013-01-02
  Changes: Database references
• Version 1.2: 2013-01-16
  Changes: Database references