1IA3

Candida albicans dihydrofolate reductase complex in which the dihydronicotinamide moiety of dihydro-nicotinamide-adenine-dinucleotide phosphate (NADPH) is displaced by 5-[(4-TERT-BUTYLPHENYL)SULFANYL]-2,4-QUINAZOLINEDIAMINE (GW995)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.78 Å
  • R-Value Work: 0.160 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

X-ray Crystal Structures of Candida albicans Dihydrofolate Reductase: High Resolution Ternary Complexes in Which the Dihydronicotinamide Moiety of NADPH is Displaced by an inhibitor

Whitlow, M.Howard, A.J.Stewart, D.Hardman, K.D.Chan, J.H.Baccanari, D.P.Tansik, R.L.Hong, J.S.Kuyper, L.F.

(2001) J.Med.Chem. 44: 2928-2932

  • Primary Citation of Related Structures:  1IA1, 1IA2, 1IA4

  • PubMed Abstract: 
  • X-ray crystallographic analysis of 5-(4'-substituted phenyl)sulfanyl-2,4-diaminoquinazoline inhibitors in ternary complex with Candida albicans dihydrofolate reductase (DHFR) and NADPH revealed two distinct modes of binding. The two compounds with sm ...

    X-ray crystallographic analysis of 5-(4'-substituted phenyl)sulfanyl-2,4-diaminoquinazoline inhibitors in ternary complex with Candida albicans dihydrofolate reductase (DHFR) and NADPH revealed two distinct modes of binding. The two compounds with small 4'-substituents (H and CH3) were found to bind with the phenyl group oriented in the plane of the quinazoline ring system and positioned adjacent to the C-helix. In contrast, the more selective inhibitors with larger 4'-substituents (tert-butyl and N-morpholino) were bound to the enzyme with the phenyl group perpendicular to the quinazoline ring and positioned in the region of the active site that typically binds the dihydronicotinamide moiety of NADPH. The cofactor appeared bound to DHFR but with the disordered dihydronicotinamide swung away from the protein surface and into solution. This unusual inhibitor binding mode may play an important role in the high DHFR selectivity of these compounds and also may provide new ideas for inhibitor design.


    Related Citations: 
    • Selective Inhibitors of Candida albicans Dihydrofolate Reductase: Activity and Selectivity of 5-(arylthio)-2,4-diaminoquinazolines
      Chan, J.H.,Hong, J.S.,Kuyper, L.F.,Baccanari, D.P.,Joyner, S.S.,Tansik, R.L.,Boytos, C.M.,Rudolph, S.K.
      (1995) J.Med.Chem. 38: 3608
    • Characterization of Candida Albicans Dihydrofolate Reductase
      Baccanari, D.P.,Tansik, R.L.,Joyner, S.S.,Fling, M.E.,Smith, P.L.,Freisheim, J.H.
      (1989) J.Biol.Chem. 264: 1100
    • X-ray Crystallographic Studies of Candida albicans Dihydrofolate Reductase. High resolution structures of the holoenzyme and an inhibited ternary complex.
      Whitlow, M.,Howard, A.J.,Stewart, D.,Hardman, K.D.,Kuyper, L.F.,Baccanari, D.P.,Fling, M.E.,Tansik, R.L.
      (1997) J.Biol.Chem. 272: 30289


    Organizational Affiliation

    GlaxoSmithKline, Inc., Five Moore Drive, Research Triangle Park, North Carolina 27709, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
DIHYDROFOLATE REDUCTASE
A, B
192Candida albicansGene Names: DFR1
EC: 1.5.1.3
Find proteins for P22906 (Candida albicans)
Go to UniProtKB:  P22906
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
TQ5
Query on TQ5

Download SDF File 
Download CCD File 
A, B
5-[4-TERT-BUTYLPHENYLSULFANYL]-2,4-QUINAZOLINEDIAMINE
C18 H20 N4 S
MNYDVPDMLAJJPB-UHFFFAOYSA-N
 Ligand Interaction
NDP
Query on NDP

Download SDF File 
Download CCD File 
A, B
NADPH DIHYDRO-NICOTINAMIDE-ADENINE-DINUCLEOTIDE PHOSPHATE
C21 H30 N7 O17 P3
ACFIXJIJDZMPPO-NNYOXOHSSA-N
 Ligand Interaction
MES
Query on MES

Download SDF File 
Download CCD File 
A, B
2-(N-MORPHOLINO)-ETHANESULFONIC ACID
C6 H13 N O4 S
SXGZJKUKBWWHRA-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
TQ5IC50: 8 nM (98) BINDINGDB
TQ5IC50: 8 nM BINDINGMOAD
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.78 Å
  • R-Value Work: 0.160 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 76.910α = 90.00
b = 67.280β = 93.07
c = 38.490γ = 90.00
Software Package:
Software NamePurpose
X-GENdata scaling
X-GENdata reduction
PROFFTrefinement
FRODOmodel building

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2001-04-11
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-10-04
    Type: Refinement description