1YX4

Structure of S5a bound to monoubiquitin provides a model for polyubiquitin recognition


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 15 
  • Conformers Submitted: 15 
  • Selection Criteria: back calculated data agree with experimental NOESY spectrum 

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Literature

Structure of S5a bound to monoubiquitin provides a model for polyubiquitin recognition

Wang, Q.Young, P.Walters, K.J.

(2005) J Mol Biol 348: 727-739

  • DOI: 10.1016/j.jmb.2005.03.007
  • Primary Citation of Related Structures:  
    1YX6, 1YX5, 1YX4

  • PubMed Abstract: 
  • Ubiquitin is a key regulatory molecule in diverse cellular events. How cells determine the outcome of ubiquitylation remains unclear; however, a likely determinant is the specificity of ubiquitin receptor proteins for polyubiquitin chains of certain length and linkage ...

    Ubiquitin is a key regulatory molecule in diverse cellular events. How cells determine the outcome of ubiquitylation remains unclear; however, a likely determinant is the specificity of ubiquitin receptor proteins for polyubiquitin chains of certain length and linkage. Proteasome subunit S5a contains two ubiquitin-interacting motifs (UIMs) through which it recruits ubiquitylated substrates to the proteasome for their degradation. Here, we report the structure of S5a (196-306) alone and complexed with two monoubiquitin molecules. This construct contains the two UIMs of S5a and we reveal their different ubiquitin-binding mechanisms and provide a rationale for their unique specificities for different ubiquitin-like domains. Furthermore, we provide direct evidence that S5a (196-306) binds either K63-linked or K48-linked polyubiquitin, and in both cases prefers longer chains. On the basis of these results we present a model for how S5a and other ubiquitin-binding proteins recognize polyubiquitin.


    Organizational Affiliation

    Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, 6-155 Jackson Hall, 321 Church St SE, Minneapolis, MN 55455, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
26S proteasome non-ATPase regulatory subunit 4A132Homo sapiensMutation(s): 0 
Gene Names: PSMD4MCB1
UniProt & NIH Common Fund Data Resources
Find proteins for P55036 (Homo sapiens)
Explore P55036 
Go to UniProtKB:  P55036
PHAROS:  P55036
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 15 
  • Conformers Submitted: 15 
  • Selection Criteria: back calculated data agree with experimental NOESY spectrum 
  • OLDERADO: 1YX4 Olderado

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2005-04-19
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance