4M97

Calcium-Dependent Protein Kinase 1 from Neospora caninum


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.05 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.203 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Neospora caninum Calcium-Dependent Protein Kinase 1 Is an Effective Drug Target for Neosporosis Therapy.

Ojo, K.K.Reid, M.C.Kallur Siddaramaiah, L.Muller, J.Winzer, P.Zhang, Z.Keyloun, K.R.Vidadala, R.S.Merritt, E.A.Hol, W.G.Maly, D.J.Fan, E.Van Voorhis, W.C.Hemphill, A.

(2014) Plos One 9: e92929-e92929

  • DOI: 10.1371/journal.pone.0092929
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Despite the enormous economic importance of Neospora caninum related veterinary diseases, the number of effective therapeutic agents is relatively small. Development of new therapeutic strategies to combat the economic impact of neosporosis remains a ...

    Despite the enormous economic importance of Neospora caninum related veterinary diseases, the number of effective therapeutic agents is relatively small. Development of new therapeutic strategies to combat the economic impact of neosporosis remains an important scientific endeavor. This study demonstrates molecular, structural and phenotypic evidence that N. caninum calcium-dependent protein kinase 1 (NcCDPK1) is a promising molecular target for neosporosis drug development. Recombinant NcCDPK1 was expressed, purified and screened against a select group of bumped kinase inhibitors (BKIs) previously shown to have low IC50s against Toxoplasma gondii CDPK1 and T. gondii tachyzoites. NcCDPK1 was inhibited by low concentrations of BKIs. The three-dimensional structure of NcCDPK1 in complex with BKIs was studied crystallographically. The BKI-NcCDPK1 structures demonstrated the structural basis for potency and selectivity. Calcium-dependent conformational changes in solution as characterized by small-angle X-ray scattering are consistent with previous structures in low Calcium-state but different in the Calcium-bound active state than predicted by X-ray crystallography. BKIs effectively inhibited N. caninum tachyzoite proliferation in vitro. Electron microscopic analysis of N. caninum cells revealed ultra-structural changes in the presence of BKI compound 1294. BKI compound 1294 interfered with an early step in Neospora tachyzoite host cell invasion and egress. Prolonged incubation in the presence of 1294 interfered produced observable interference with viability and replication. Oral dosing of BKI compound 1294 at 50 mg/kg for 5 days in established murine neosporosis resulted in a 10-fold reduced cerebral parasite burden compared to untreated control. Further experiments are needed to determine the PK, optimal dosage, and duration for effective treatment in cattle and dogs, but these data demonstrate proof-of-concept for BKIs, and 1294 specifically, for therapy of bovine and canine neosporosis.


    Related Citations: 
    • Toxoplasma gondii calcium-dependent protein kinase 1 is a target for selective kinase inhibitors.
      Ojo, K.K.,Larson, E.T.,Keyloun, K.R.,Castaneda, L.J.,Derocher, A.E.,Inampudi, K.K.,Kim, J.E.,Arakaki, T.L.,Murphy, R.C.,Zhang, L.,Napuli, A.J.,Maly, D.J.,Verlinde, C.L.,Buckner, F.S.,Parsons, M.,Hol, W.G.,Merritt, E.A.,Van Voorhis, W.C.
      (2010) Nat.Struct.Mol.Biol. 17: 602


    Organizational Affiliation

    Institute of Parasitology, Vetsuisse Faculty, University of Berne, Berne, Switzerland.,Department of Biochemistry, University of Washington, Seattle, Washington, United States of America.,Center for Emerging and Re-emerging Infectious Diseases (CERID), Division of Allergy and Infectious Diseases, Department of Medicine, University of Washington, Seattle, Washington, United States of America.,Department of Chemistry, University of Washington, Seattle, Washington, United States of America.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Calmodulin-like domain protein kinase isoenzyme gamma, related
A
485Neospora caninum (strain Liverpool)Mutation(s): 0 
Find proteins for F0V9W9 (Neospora caninum (strain Liverpool))
Go to UniProtKB:  F0V9W9
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.05 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.203 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 48.060α = 90.00
b = 72.690β = 96.98
c = 65.750γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
REFMACrefinement
PDB_EXTRACTdata extraction
Blu-Icedata collection
MOSFLMdata reduction
Aimlessdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2013-08-14 
  • Released Date: 2013-10-02 
  • Deposition Author(s): Merritt, E.A.

Revision History 

  • Version 1.0: 2013-10-02
    Type: Initial release
  • Version 1.1: 2014-05-07
    Type: Database references