4C0T

Candida albicans PKh Kinase Domain


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.16 Å
  • R-Value Free: 0.280 
  • R-Value Work: 0.228 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

The Pif-Pocket as a Target for C. Albicans Pkh Selective Inhibitors.

Pastor-Flores, D.Schulze, J.O.Bahi, A.Giacometti, R.Ferrer-Dalmau, J.Passeron, S.Engel, M.Suess, E.Casamayor, A.Biondi, R.M.

(2013) Acs Chem.Biol. 8: 2283

  • DOI: 10.1021/cb400452z

  • PubMed Abstract: 
  • The phosphoinositide-dependent protein kinase 1, PDK1, is a master kinase that phosphorylates the activation loop of up to 23 AGC kinases. S. cerevisiae has three PDK1 orthologues, Pkh1-3, which also phosphorylate AGC kinases (e.g., Ypk, Tpk, Pkc1, a ...

    The phosphoinositide-dependent protein kinase 1, PDK1, is a master kinase that phosphorylates the activation loop of up to 23 AGC kinases. S. cerevisiae has three PDK1 orthologues, Pkh1-3, which also phosphorylate AGC kinases (e.g., Ypk, Tpk, Pkc1, and Sch9). Pkh1 and 2 are redundant proteins involved in multiple essential cellular functions, including endocytosis and cell wall integrity. Based on similarities with the budding yeast, the Pkh of fungal infectious species was postulated as a novel target for antifungals. Here, we found that depletion of Pkh eventually induces oxidative stress and DNA double-strand breaks, leading to programmed cell death. This finding supports Pkh as an antifungal target since pharmacological inhibition of Pkh would lead to the death of yeast cells, the ultimate goal of antifungals. It was therefore of interest to further investigate the possibility to develop Pkh inhibitors with selectivity for Candida Pkh that would not inhibit the human ortholog. Here, we describe C. albicans Pkh2 biochemically, structurally and by using chemical probes in comparison to human PDK1. We found that a regulatory site on the C. albicans Pkh2 catalytic domain, the PIF-pocket, diverges from human PDK1. Indeed, we identified and characterized PS77, a new small allosteric inhibitor directed to the PIF-pocket, which has increased selectivity for C. albicans Pkh2. Together, our results describe novel features of the biology of Pkh and chemical biology approaches that support the validation of Pkh as a drug target for selective antifungals.


    Organizational Affiliation

    Research Group PhosphoSites, Medizinische Klinik 1, Universitätsklinikum Frankfurt, Theodor-Stern-Kai 7, 60590 Frankfurt, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
LIKELY PROTEIN KINASE
A
974Candida albicans (strain SC5314 / ATCC MYA-2876)Mutation(s): 0 
Gene Names: PKH2 (PKH1)
EC: 2.7.11.1
Find proteins for Q5A3P6 (Candida albicans (strain SC5314 / ATCC MYA-2876))
Go to UniProtKB:  Q5A3P6
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
SEP
Query on SEP
A
L-PEPTIDE LINKINGC3 H8 N O6 PSER
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.16 Å
  • R-Value Free: 0.280 
  • R-Value Work: 0.228 
  • Space Group: P 42 21 2
Unit Cell:
Length (Å)Angle (°)
a = 100.210α = 90.00
b = 100.210β = 90.00
c = 60.060γ = 90.00
Software Package:
Software NamePurpose
XDSdata reduction
PHENIXrefinement
XSCALEdata scaling
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-10-23
    Type: Initial release
  • Version 1.1: 2013-10-30
    Type: Database references