Biological Assembly 1  

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

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

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

Biological Assembly Evidence: gel filtration

Macromolecule Content

• Total Structure Weight: 37.12 kDa 
• Atom Count: 2735 
• Modelled Residue Count: 322 
• Deposited Residue Count: 326 
• Unique protein chains: 2

6AU8

1.8 angstrom crystal structure of the human Bag6-NLS & TRC35 complex

• PDB DOI: 10.2210/pdb6AU8/pdb

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


• Deposited: 2017-08-31 Released: 2017-11-01 
• Deposition Author(s): Mock, J.Y., Clemons Jr., W.M.
• Funding Organization(s): National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.80 Å
• R-Value Free: 0.202 
• R-Value Work: 0.159 
• R-Value Observed: 0.162 

Literature

Structural basis for regulation of the nucleo-cytoplasmic distribution of Bag6 by TRC35.

Mock, J.Y., Xu, Y., Ye, Y., Clemons, W.M.

(2017) Proc Natl Acad Sci U S A 114: 11679-11684

• PubMed: 29042515 
• DOI: 10.1073/pnas.1702940114
• Primary Citation of Related Structures:  
  6AU8


• PubMed Abstract: 
  

The metazoan protein BCL2-associated athanogene cochaperone 6 (Bag6) forms a hetero-trimeric complex with ubiquitin-like 4A and transmembrane domain recognition complex 35 (TRC35). This Bag6 complex is involved in tail-anchored protein targeting and various protein quality-control pathways in the cytosol as well as regulating transcription and histone methylation in the nucleus. Here we present a crystal structure of Bag6 and its cytoplasmic retention factor TRC35, revealing that TRC35 is remarkably conserved throughout the opisthokont lineage except at the C-terminal Bag6-binding groove, which evolved to accommodate Bag6, a unique metazoan factor. While TRC35 and its fungal homolog, guided entry of tail-anchored protein 4 (Get4), utilize a conserved hydrophobic patch to bind their respective partners, Bag6 wraps around TRC35 on the opposite face relative to the Get4-5 interface. We further demonstrate that TRC35 binding is critical not only for occluding the Bag6 nuclear localization sequence from karyopherin α to retain Bag6 in the cytosol but also for preventing TRC35 from succumbing to RNF126-mediated ubiquitylation and degradation. The results provide a mechanism for regulation of Bag6 nuclear localization and the functional integrity of the Bag6 complex in the cytosol.

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Organizational Affiliation: 

Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125; [e-mail].

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Golgi to ER traffic protein 4 homolog	A	283	Homo sapiens	Mutation(s): 0  Gene Names: GET4, C7orf20, CEE, TRC35, CGI-20
UniProt & NIH Common Fund Data Resources
Find proteins for Q7L5D6 (Homo sapiens) Explore Q7L5D6  Go to UniProtKB:  Q7L5D6
PHAROS:  Q7L5D6 GTEx:  ENSG00000239857

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Large proline-rich protein BAG6	B [auth C]	43	Homo sapiens	Mutation(s): 0  Gene Names: BAG6, BAT3, G3
UniProt & NIH Common Fund Data Resources
Find proteins for P46379 (Homo sapiens) Explore P46379  Go to UniProtKB:  P46379
PHAROS:  P46379 GTEx:  ENSG00000204463

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
GOL	C [auth A], D [auth C]	GLYCEROL C3 H8 O3 PEDCQBHIVMGVHV-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.80 Å
• R-Value Free: 0.202 
• R-Value Work: 0.159 
• R-Value Observed: 0.162 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 41.66	α = 90
b = 84.56	β = 90
c = 102.58	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
XSCALE	data scaling
PDB_EXTRACT	data extraction
XDS	data reduction
PHASER	phasing
Coot	model building

Structure Validation

Entry History & Funding Information

Deposition Data

• Deposited Date: 2017-08-31 
• Released Date: 2017-11-01 
Deposition Author(s): Mock, J.Y., Clemons Jr., W.M.

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Funding Organization	Location	Grant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)	United States	GM097572

Revision History  

• Version 1.0: 2017-11-01
  Type: Initial release
  
• Version 1.1: 2017-11-15
  Changes: Database references
• Version 1.2: 2017-12-06
  Changes: Author supporting evidence
• Version 1.3: 2020-01-01
  Changes: Author supporting evidence