4O6W

Peptide-Based Inhibitors of Plk1 Polo-box Domain


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.448 Å
  • R-Value Free: 0.215 
  • R-Value Work: 0.184 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

Mono-anionic phosphopeptides produced by unexpected histidine alkylation exhibit high plk1 polo-box domain-binding affinities and enhanced antiproliferative effects in hela cells.

Qian, W.J.Park, J.E.Lim, D.Lai, C.C.Kelley, J.A.Park, S.Y.Lee, K.W.Yaffe, M.B.Lee, K.S.Burke, T.R.

(2014) Biopolymers 102: 444-455

  • DOI: 10.1002/bip.22569

  • PubMed Abstract: 
  • Binding of polo-like kinase 1 (Plk1) polo-box domains (PBDs) to phosphothreonine (pThr)/phosphoserine (pSer)-containing sequences is critical for the proper function of Plk1. Although high-affinity synthetic pThr-containing peptides provide starting ...

    Binding of polo-like kinase 1 (Plk1) polo-box domains (PBDs) to phosphothreonine (pThr)/phosphoserine (pSer)-containing sequences is critical for the proper function of Plk1. Although high-affinity synthetic pThr-containing peptides provide starting points for developing PBD-directed inhibitors, to date the efficacy of such peptides in whole cell assays has been poor. This potentially reflects limited cell membrane permeability arising, in part, from the di-anionic nature of the phosphoryl group or its mimetics. In our current article we report the unanticipated on-resin N(τ)-alkylation of histidine residues already bearing a N(π)- alkyl group. This resulted in cationic imidazolium-containing pThr peptides, several of which exhibit single-digit nanomolar PBD-binding affinities in extracellular assays and improved antimitotic efficacies in intact cells. We enhanced the cellular efficacies of these peptides further by applying bio-reversible pivaloyloxymethyl (POM) phosphoryl protection. New structural insights presented in our current study, including the potential utility of intramolecular charge masking, may be useful for the further development of PBD-binding peptides and peptide mimetics.


    Organizational Affiliation

    Chemical Biology Laboratory, Center for Cancer Research, National Institutes of Health, NCI at Frederick, Frederick, MD, 21702.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Serine/threonine-protein kinase PLK1
A
237Homo sapiensMutation(s): 0 
Gene Names: PLK1 (PLK)
EC: 2.7.11.21
Find proteins for P53350 (Homo sapiens)
Go to Gene View: PLK1
Go to UniProtKB:  P53350
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Peptide-Based inhibitor
C
7N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Small Molecules
Biologically Interesting Molecules 1 Unique
IDChainsNameType/Class2D Diagram3D Interactions
PRD_001173
Query on PRD_001173
CPhosphothreonine ester-containing peptidePolypeptide / Enzyme inhibitor

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Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.448 Å
  • R-Value Free: 0.215 
  • R-Value Work: 0.184 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 35.819α = 90.00
b = 51.275β = 101.19
c = 58.006γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data scaling
AMoREphasing
StructureStudiodata collection
PHENIXrefinement
HKL-2000data reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-12-03
    Type: Initial release