4GPL

Structure of Cbl(TKB) bound to a phosphorylated pentapeptide


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.182 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

The paradox of conformational constraint in the design of Cbl(TKB)-binding peptides.

Kumar, E.A.Chen, Q.Kizhake, S.Kolar, C.Kang, M.Chang, C.E.Borgstahl, G.E.Natarajan, A.

(2013) Sci Rep 3: 1639-1639

  • DOI: 10.1038/srep01639

  • PubMed Abstract: 
  • Solving the crystal structure of Cbl(TKB) in complex with a pentapeptide, pYTPEP, revealed that the PEP region adopted a poly-L-proline type II (PPII) helix. An unnatural amino acid termed a proline-templated glutamic acid (ptE) that constrained both ...

    Solving the crystal structure of Cbl(TKB) in complex with a pentapeptide, pYTPEP, revealed that the PEP region adopted a poly-L-proline type II (PPII) helix. An unnatural amino acid termed a proline-templated glutamic acid (ptE) that constrained both the backbone and sidechain to the bound conformation was synthesized and incorporated into the pYTPXP peptide. We estimated imposing structural constraints onto the backbone and sidechain of the peptide and preorganize it to the bound conformation in solution will yield nearly an order of magnitude improvement in activity. NMR studies confirmed that the ptE-containing peptide adopts the PPII conformation, however, competitive binding studies showed an order of magnitude loss of activity. Given the emphasis that is placed on imposing structural constraints, we provide an example to support the contrary. These results point to conformational flexibility at the interface, which have implications in the design of potent Cbl(TKB)-binding peptides.


    Organizational Affiliation

    Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, Omaha, Nebraska 68022, United States.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ACE-PTR-THR-PRO-GLU-PRO, PEPTIDE INHIBITOR
A
7N/A
Protein Feature View is not available: No corresponding UniProt sequence found.
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
E3 ubiquitin-protein ligase CBL
B
309Homo sapiensGene Names: CBL (CBL2, RNF55)
EC: 2.3.2.27
Find proteins for P22681 (Homo sapiens)
Go to Gene View: CBL
Go to UniProtKB:  P22681
Small Molecules
Modified Residues  3 Unique
IDChainsTypeFormula2D DiagramParent
NH2
Query on NH2
A
NON-POLYMERH2 N

--

PTR
Query on PTR
A
L-PEPTIDE LINKINGC9 H12 N O6 PTYR
ACE
Query on ACE
A
NON-POLYMERC2 H4 O

--

Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.182 
  • Space Group: P 6
Unit Cell:
Length (Å)Angle (°)
a = 122.574α = 90.00
b = 122.574β = 90.00
c = 56.231γ = 120.00
Software Package:
Software NamePurpose
CrystalCleardata reduction
CrystalCleardata collection
CrystalCleardata scaling
MOLREPphasing
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-09-18
    Type: Initial release