Representative 2-conformer ensembles of K27-linked Ub2 from RDC data

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100000 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the best agreement with RDC data 

wwPDB Validation   3D Report Full Report

This is version 1.2 of the entry. See complete history


Linkage via K27 Bestows Ubiquitin Chains with Unique Properties among Polyubiquitins.

Castaneda, C.A.Dixon, E.K.Walker, O.Chaturvedi, A.Nakasone, M.A.Curtis, J.E.Reed, M.R.Krueger, S.Cropp, T.A.Fushman, D.

(2016) Structure 24: 423-436

  • DOI: https://doi.org/10.1016/j.str.2016.01.007
  • Primary Citation of Related Structures:  
    5UJL, 5UJN

  • PubMed Abstract: 

    Polyubiquitination, a critical protein post-translational modification, signals for a diverse set of cellular events via the different isopeptide linkages formed between the C terminus of one ubiquitin (Ub) and the ɛ-amine of K6, K11, K27, K29, K33, K48, or K63 of a second Ub. We assembled di-ubiquitins (Ub2) comprising every lysine linkage and examined them biochemically and structurally. Of these, K27-Ub2 is unique as it is not cleaved by most deubiquitinases. As this remains the only structurally uncharacterized lysine linkage, we comprehensively examined the structures and dynamics of K27-Ub2 using nuclear magnetic resonance, small-angle neutron scattering, and in silico ensemble modeling. Our structural data provide insights into the functional properties of K27-Ub2, in particular that K27-Ub2 may be specifically recognized by K48-selective receptor UBA2 domain from proteasomal shuttle protein hHR23a. Binding studies and mutagenesis confirmed this prediction, further highlighting structural/recognition versatility of polyubiquitins and the potential power of determining function from elucidation of conformational ensembles.

  • Organizational Affiliation

    Department of Chemistry and Biochemistry, Center for Biomolecular Structure and Organization, University of Maryland, College Park, MD 20742, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
76Homo sapiensMutation(s): 0 
Gene Names: UBB
UniProt & NIH Common Fund Data Resources
Find proteins for P0CG47 (Homo sapiens)
Explore P0CG47 
Go to UniProtKB:  P0CG47
GTEx:  ENSG00000170315 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0CG47
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100000 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the best agreement with RDC data 

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesGM065334

Revision History  (Full details and data files)

  • Version 1.0: 2018-08-08
    Type: Initial release
  • Version 1.1: 2020-01-01
    Changes: Author supporting evidence, Data collection
  • Version 1.2: 2023-06-14
    Changes: Database references, Other