Cullin3 - BTB interface: a novel target for stapled peptides

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation   3D Report Full Report

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Cullin3 - BTB Interface: A Novel Target for Stapled Peptides.

de Paola, I.Pirone, L.Palmieri, M.Balasco, N.Esposito, L.Russo, L.Mazza, D.Di Marcotullio, L.Di Gaetano, S.Malgieri, G.Vitagliano, L.Pedone, E.Zaccaro, L.

(2015) PLoS One 10: e0121149-e0121149

  • DOI: https://doi.org/10.1371/journal.pone.0121149
  • Primary Citation of Related Structures:  
    2MYL, 2MYM

  • PubMed Abstract: 

    Cullin3 (Cul3), a key factor of protein ubiquitination, is able to interact with dozens of different proteins containing a BTB (Bric-a-brac, Tramtrack and Broad Complex) domain. We here targeted the Cul3-BTB interface by using the intriguing approach of stabilizing the α-helical conformation of Cul3-based peptides through the "stapling" with a hydrocarbon cross-linker. In particular, by combining theoretical and experimental techniques, we designed and characterized stapled Cul3-based peptides embedding the helix 2 of the protein (residues 49-68). Intriguingly, CD and NMR experiments demonstrate that these stapled peptides were able to adopt the helical structure that the fragment assumes in the parent protein. We also show that some of these peptides were able to bind to the BTB of the tetrameric KCTD11, a substrate adaptor involved in HDAC1 degradation, with high affinity (~ 300-600 nM). Cul3-derived staple peptides are also able to bind the BTB of the pentameric KCTD5. Interestingly, the affinity of these peptides is of the same order of magnitude of that reported for the interaction of full-length Cul3 with some BTB containing proteins. Moreover, present data indicate that stapling endows these peptides with an increased serum stability. Altogether, these findings indicate that the designed stapled peptides can efficiently mimic protein-protein interactions and are potentially able to modulate fundamental biological processes involving Cul3.

  • Organizational Affiliation

    Department of Molecular Medicine, La Sapienza University, Roma, Italy.


Find similar proteins by:  Sequence   |   3D Structure  

Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Cullin-320Homo sapiensMutation(s): 0 
Gene Names: CUL3KIAA0617
UniProt & NIH Common Fund Data Resources
Find proteins for Q13618 (Homo sapiens)
Explore Q13618 
Go to UniProtKB:  Q13618
PHAROS:  Q13618
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ13618
Sequence Annotations
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on MK8
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-04-22
    Type: Initial release
  • Version 2.0: 2023-11-15
    Changes: Atomic model, Data collection, Database references, Derived calculations