Solution Structure of the Ubiquitin-like Domain of hPLIC-2

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 20 
  • Conformers Submitted: 20 
  • Selection Criteria: all calculated structures submitted 

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This is version 1.3 of the entry. See complete history


Structural studies of the interaction between ubiquitin family proteins and proteasome subunit S5a.

Walters, K.J.Kleijnen, M.F.Goh, A.M.Wagner, G.Howley, P.M.

(2002) Biochemistry 41: 1767-1777

  • DOI: https://doi.org/10.1021/bi011892y
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The 26S proteasome is essential for the proteolysis of proteins that have been covalently modified by the attachment of polyubiquitinated chains. Although the 20S core particle performs the degradation, the 19S regulatory cap complex is responsible for recognition of polyubiquitinated substrates. We have focused on how the S5a component of the 19S complex interacts with different ubiquitin-like (ubl) modules, to advance our understanding of how polyubiquitinated proteins are targeted to the proteasome. To achieve this, we have determined the solution structure of the ubl domain of hPLIC-2 and obtained a structural model of hHR23a by using NMR spectroscopy and homology modeling. We have also compared the S5a binding properties of ubiquitin, SUMO-1, and the ubl domains of hPLIC-2 and hHR23a and have identified the residues on their respective S5a contact surfaces. We provide evidence that the S5a-binding surface on the ubl domain of hPLIC-2 is required for its interaction with the proteasome. This study provides structural insights into protein recognition by the proteasome, and illustrates how the protein surface of a commonly utilized fold has highly evolved for various biological roles.

  • Organizational Affiliation

    Department of Pathology and Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, Massachusetts 02115, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
ubiquitin-like protein hPLIC-2125Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for Q9UHD9 (Homo sapiens)
Explore Q9UHD9 
Go to UniProtKB:  Q9UHD9
GTEx:  ENSG00000188021 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9UHD9
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 20 
  • Conformers Submitted: 20 
  • Selection Criteria: all calculated structures submitted 

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2002-03-20
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2022-02-23
    Changes: Database references, Derived calculations