5MZU image
Deposition Date 2017-02-01
Release Date 2018-02-14
Last Version Date 2024-11-13
Entry Detail
PDB ID:
5MZU
Keywords:
Title:
Crystal structure of the myosin chaperone UNC-45 from C. elegans (alternative conformation)
Biological Source:
Source Organism:
Method Details:
Experimental Method:
Resolution:
3.80 Å
R-Value Free:
0.31
R-Value Work:
0.29
R-Value Observed:
0.29
Space Group:
P 61 2 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:UNC-45
Gene (Uniprot):unc-45
Chain IDs:A
Chain Length:961
Number of Molecules:1
Biological Source:Caenorhabditis elegans
Primary Citation
UFD-2 is an adaptor-assisted E3 ligase targeting unfolded proteins.
Nat Commun 9 484 484 (2018)
PMID: 29396393 DOI: 10.1038/s41467-018-02924-7

Abstact

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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