2F42 image
Deposition Date 2005-11-22
Release Date 2006-05-02
Last Version Date 2024-02-14
Entry Detail
PDB ID:
2F42
Keywords:
Title:
dimerization and U-box domains of Zebrafish C-terminal of HSP70 interacting protein
Biological Source:
Source Organism:
Danio rerio (Taxon ID: 7955)
Host Organism:
Method Details:
Experimental Method:
Resolution:
2.50 Å
R-Value Free:
0.28
R-Value Work:
0.26
R-Value Observed:
0.26
Space Group:
P 65 2 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:STIP1 homology and U-box containing protein 1
Chain IDs:A
Chain Length:179
Number of Molecules:1
Biological Source:Danio rerio
Ligand Molecules
Primary Citation
Structure and Interactions of the Helical and U-Box Domains of CHIP, the C Terminus of HSP70 Interacting Protein.
Biochemistry 45 4749 4759 (2006)
PMID: 16605243 DOI: 10.1021/bi0601508

Abstact

The heat-shock proteins Hsp70 and Hsp90 play a crucial role in regulating protein quality control both by refolding and by preventing the aggregation of misfolded proteins. It has recently been shown that Hsp70 and Hsp90 act not only in protein refolding but also cooperate with the C terminus of Hsp70 interacting protein (CHIP), a multidomain ubiquitin ligase, to mediate the degradation of unfolded proteins. We present the crystal structure of the helical linker domain and U-box domain of zebrafish CHIP (DrCHIP-HU). The structure of DrCHIP-HU shows a symmetric homodimer. The conformation of the helical linker domains and the relative positions of the helical and U-box domains differ substantially in DrCHIP-HU from those in a recently published structure of an asymmetric dimer of mammalian (mouse) CHIP. We used an in vitro ubiquitination assay to identify residues, located on two long loops and a central alpha helix of the CHIP U-box domain, that are important for interacting with the ubiquitin-conjugating enzyme UbcH5b. In addition, we used NMR spectroscopy to define a complementary interaction surface located on the N-terminal alpha helix and the L4 and L7 loops of UbcH5b. Our results provide insights into conformational variability in the domain arrangement of CHIP and into U-box-mediated recruitment of UbcH5b for the ubiquitination of Hsp70 and Hsp90 substrates.

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Primary Citation of related structures