5MZU

Crystal structure of the myosin chaperone UNC-45 from C. elegans (alternative conformation)

• PDB DOI: https://doi.org/10.2210/pdb5MZU/pdb

• Classification: CHAPERONE
• Organism(s): Caenorhabditis elegans
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2017-02-01 Released: 2018-02-14 
• Deposition Author(s): Hellerschmied, D., Gazda, L., Clausen, T.
• Funding Organization(s): Austrian Science Fund

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 3.80 Å
• R-Value Free: 0.319 
• R-Value Work: 0.298 
• R-Value Observed: 0.299 

Literature

UFD-2 is an adaptor-assisted E3 ligase targeting unfolded proteins.

Hellerschmied, D., Roessler, M., Lehner, A., Gazda, L., Stejskal, K., Imre, R., Mechtler, K., Dammermann, A., Clausen, T.

(2018) Nat Commun 9: 484-484

• PubMed: 29396393 
• DOI: https://doi.org/10.1038/s41467-018-02924-7
• Primary Citation of Related Structures:  
  5MZU


• PubMed Abstract: 
  

  Muscle development requires the coordinated activities of specific protein folding and degradation factors. UFD-2, a U-box ubiquitin ligase, has been reported to play a central role in this orchestra regulating the myosin chaperone UNC-45. Here, we apply an integrative in vitro and in vivo approach to delineate the substrate-targeting mechanism of UFD-2 and elucidate its distinct mechanistic features as an E3/E4 enzyme. Using Caenorhabditis elegans as model system, we demonstrate that UFD-2 is not regulating the protein levels of UNC-45 in muscle cells, but rather shows the characteristic properties of a bona fide E3 ligase involved in protein quality control. Our data demonstrate that UFD-2 preferentially targets unfolded protein segments. Moreover, the UNC-45 chaperone can serve as an adaptor protein of UFD-2 to poly-ubiquitinate unfolded myosin, pointing to a possible role of the UFD-2/UNC-45 pair in maintaining proteostasis in muscle cells.

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Organizational Affiliation: 

Research Institute of Molecular Pathology (IMP), Vienna BioCenter (VBC), Campus-Vienna-Biocenter 1, 1030, Vienna, Austria.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 108.55 kDa 
• Atom Count: 5,991 
• Modelled Residue Count: 869 
• Deposited Residue Count: 961 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
UNC-45	A	961	Caenorhabditis elegans	Mutation(s): 0  Gene Names: unc-45, CELE_F30H5.1, F30H5.1
UniProt
Find proteins for G5EG62 (Caenorhabditis elegans) Explore G5EG62  Go to UniProtKB:  G5EG62

Small Molecules

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
MSE	A	L-PEPTIDE LINKING	C5 H11 N O2 Se		MET

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 3.80 Å
• R-Value Free: 0.319 
• R-Value Work: 0.298 
• R-Value Observed: 0.299 
• Space Group: P 6₁ 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 86.149	α = 90
b = 86.149	β = 90
c = 716.465	γ = 120

Software Package:

Software Name	Purpose
PHENIX	refinement
HKL-2000	data reduction
SCALEPACK	data scaling
PHASER	phasing
PDB_EXTRACT	data extraction
HKL	data reduction

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2018-02-14 
Deposition Author(s): Hellerschmied, D., Gazda, L., Clausen, T.

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Funding Organization	Location	Grant Number
Austrian Science Fund	Austria	P22750

Revision History  

• Version 1.0: 2018-02-14
  Type: Initial release