2MYM image
Entry Detail
PDB ID:
2MYM
Keywords:
Title:
Cullin3 - BTB interface: a novel target for stapled peptides
Biological Source:
Source Organism:
PDB Version:
Deposition Date:
2015-01-27
Release Date:
2015-04-22
Method Details:
Experimental Method:
Conformers Calculated:
100
Conformers Submitted:
20
Selection Criteria:
structures with the lowest energy
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Cullin-3
Chain IDs:A
Chain Length:20
Number of Molecules:1
Biological Source:Human
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
MK8 A LEU 2-METHYL-L-NORLEUCINE
Ligand Molecules
Primary Citation
Cullin3 - BTB Interface: A Novel Target for Stapled Peptides.
Plos One 10 e0121149 e0121149 (2015)
PMID: 25848797 DOI: 10.1371/journal.pone.0121149

Abstact

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.

Legend

Protein

Chemical

Disease

Primary Citation of related structures