Biological Assembly 1  

 3D View: Structure

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 2.39 kDa 
• Atom Count: 167 
• Modelled Residue Count: 20 
• Deposited Residue Count: 20 
• Unique protein chains: 1

2MYL

Cullin3 - BTB interface: a novel target for stapled peptides

• DOI: 10.2210/pdb2MYL/pdb
• BMRB: 25456

• Classification: PROTEIN BINDING
• Organism(s): Homo sapiens
• Mutation(s): No 


• Deposited: 2015-01-27 Released: 2015-04-22 
• Deposition Author(s): Russo, L., Palmieri, M., Malgieri, G.

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Experimental Data Snapshot

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

Literature

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

• PubMed: 25848797 
• DOI: 10.1371/journal.pone.0121149
• Primary Citation of Related Structures:  
  2MYM, 2MYL


• 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.

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Organizational Affiliation: 

Institute of Biostructures and Bioimaging, C.N.R., Napoli, Italy; Interuniversity Centre for Research on Bioactive Peptides (CIRPEB), Napoli, Italy.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Cullin-3	A	20	Homo sapiens	Mutation(s): 0  Gene Names: CUL3, KIAA0617
UniProt & NIH Common Fund Data Resources
Find proteins for Q13618 (Homo sapiens) Explore Q13618  Go to UniProtKB:  Q13618
PHAROS:  Q13618 GTEx:  ENSG00000036257

Small Molecules

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
MK8	A	L-PEPTIDE LINKING	C7 H15 N O2		LEU

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 100 
• Conformers Submitted: 20 
• Selection Criteria: structures with the lowest energy 
• OLDERADO: 2MYL Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2015-01-27 
• Released Date: 2015-04-22 
Deposition Author(s): Russo, L., Palmieri, M., Malgieri, G.

Revision History  

• Version 1.0: 2015-04-22
  Type: Initial release