Biological Assembly 1  

 3D View: Structure | 1D-3D View | Validation Report

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 20.00 kDa 
• Atom Count: 1054 
• Modelled Residue Count: 134 
• Deposited Residue Count: 180 
• Unique protein chains: 2

2M86

Solution structure of Hdm2 with engineered cyclotide

• PDB DOI: 10.2210/pdb2M86/pdb
• BMRB: 19230

• Classification: PROTEIN BINDING/SIGNALING PROTEIN
• Organism(s): synthetic construct, Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2013-05-07 Released: 2013-07-31 
• Deposition Author(s): Majumder, S., Ji, Y., Millard, M., Borra, R., Bi, T., Elnagar, A.Y., Neamati, N., Camarero, J.A.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 1000 
• Conformers Submitted: 10 
• Selection Criteria: structures with the lowest energy 

Literature

In Vivo Activation of the p53 Tumor Suppressor Pathway by an Engineered Cyclotide.

Ji, Y., Majumder, S., Millard, M., Borra, R., Bi, T., Elnagar, A.Y., Neamati, N., Shekhtman, A., Camarero, J.A.

(2013) J Am Chem Soc 135: 11623-11633

• PubMed: 23848581 
• DOI: 10.1021/ja405108p
• Primary Citation of Related Structures:  
  2M86


• PubMed Abstract: 
  

The overexpression of Hdm2 and HdmX is a common mechanism used by many tumor cells to inactive the p53 tumor suppressor pathway promoting cell survival. Targeting Hdm2 and HdmX has emerged as a validated therapeutic strategy for treating cancers with wild-type p53. Small linear peptides mimicking the N-terminal fragment of p53 have been shown to be potent Hdm2/HdmX antagonists. The potential therapeutic use of these peptides, however, is limited by their poor stability and bioavailability. Here, we report the engineering of the cyclotide MCoTI-I to efficiently antagonize intracellular p53 degradation. The resulting cyclotide MCo-PMI was able to bind with low nanomolar affinity to both Hdm2 and HdmX, showed high stability in human serum, and was cytotoxic to wild-type p53 cancer cell lines by activating the p53 tumor suppressor pathway both in vitro and in vivo. These features make the cyclotide MCoTI-I an optimal scaffold for targeting intracellular protein-protein interactions.

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Organizational Affiliation: 

Department of Chemistry, University of Southern California, Los Angeles, CA 90033, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
MCo-PMI	A	51	synthetic construct	Mutation(s): 0

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
E3 ubiquitin-protein ligase Mdm2	B	129	Homo sapiens	Mutation(s): 0  Gene Names: MDM2 EC: 2.3.2.27
UniProt & NIH Common Fund Data Resources
Find proteins for Q00987 (Homo sapiens) Explore Q00987  Go to UniProtKB:  Q00987
PHAROS:  Q00987

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 1000 
• Conformers Submitted: 10 
• Selection Criteria: structures with the lowest energy 
• OLDERADO: 2M86 Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2013-05-07 
• Released Date: 2013-07-31 
Deposition Author(s): Majumder, S., Ji, Y., Millard, M., Borra, R., Bi, T., Elnagar, A.Y., Neamati, N., Camarero, J.A.

Revision History  

• Version 1.0: 2013-07-31
  Type: Initial release
  
• Version 1.1: 2013-08-21
  Changes: Database references