ISDA

Deposition Date 2010-08-26

Release Date 2011-03-23

Last Version Date 2023-09-06

Entry Detail

PDB ID:

3OLM

Keywords:

LIGASE

Title:

Structure and Function of a Ubiquitin Binding Site within the Catalytic Domain of a HECT Ubiquitin Ligase

Biological Source:

Source Organism:

Saccharomyces cerevisiae (Taxon ID: 4932)

Host Organism:

Escherichia coli

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

2.50 Å

R-Value Free:

0.27

R-Value Work:

0.22

R-Value Observed:

0.22

Space Group:

C 1 2 1

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Macromolecular Entities

Protein Blast

Polymer Type:polypeptide(L)
Molecule:E3 ubiquitin-protein ligase RSP5
Gene (Uniprot):RSP5
Chain IDs:A
Chain Length:429
Number of Molecules:1
Biological Source:Saccharomyces cerevisiae

UniProt ID:P39940 Pfam ID:PF00397, PF00632 EC:2.3.2.26

Protein Blast

Polymer Type:polypeptide(L)
Molecule:Ubiquitin
Gene (Uniprot):UBI4
Chain IDs:B (auth: D)
Chain Length:79
Number of Molecules:1
Biological Source:Saccharomyces cerevisiae

UniProt ID:P0CG63 Pfam ID:PF00240

Primary Citation

Structure and function of a HECT domain ubiquitin-binding site.

Kim, H.C, Steffen, A.M, Oldham, M.L, Chen, J, Huibregtse, J.M.Show

Embo Rep. 12 334 341 (2011)

PMID: 21399621 DOI: 10.1038/embor.2011.23

Abstact

The Rsp5 ubiquitin ligase contains a non-covalent binding site for ubiquitin within the amino-terminal lobe (N-lobe) of the HECT domain, and the X-ray crystal structure of the HECT-ubiquitin complex has been determined. Hydrophobic patch residues of ubiquitin (L8, I44, V70) were crucial for interaction with Rsp5, and amino-acid alterations at the Rsp5-binding interface resulted in defects in polyubiquitination. Our results support a model in which the N-lobe-binding site acts to localize and orient the distal end of the ubiquitin chain to promote conjugation of the next ubiquitin molecule.

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