6A2N

Crystal structure of quadruple mutant (N51I+C59R+S108N+I164L) Plasmodium falciparum DHFR-TS complexed with BT2, NADPH, and dUMP


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.45 Å
  • R-Value Free: 0.291 
  • R-Value Work: 0.203 
  • R-Value Observed: 0.208 

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Ligand Structure Quality Assessment 


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Literature

Hybrid Inhibitors of Malarial Dihydrofolate Reductase with Dual Binding Modes That Can Forestall Resistance.

Tarnchompoo, B.Chitnumsub, P.Jaruwat, A.Shaw, P.J.Vanichtanankul, J.Poen, S.Rattanajak, R.Wongsombat, C.Tonsomboon, A.Decharuangsilp, S.Anukunwithaya, T.Arwon, U.Kamchonwongpaisan, S.Yuthavong, Y.

(2018) ACS Med Chem Lett 9: 1235-1240

  • DOI: 10.1021/acsmedchemlett.8b00389
  • Primary Citation of Related Structures:  
    6A2K, 6A2L, 6A2M, 6A2N, 6A2O, 6A2P, 6A7C, 6A7E

  • PubMed Abstract: 
  • The S108N mutation of dihydrofolate reductase (DHFR) renders Plasmodium falciparum malaria parasites resistant to pyrimethamine through steric clash with the rigid side chain of the inhibitor. Inhibitors with flexible side chains can avoid this clash and retain effectiveness against the mutant ...

    The S108N mutation of dihydrofolate reductase (DHFR) renders Plasmodium falciparum malaria parasites resistant to pyrimethamine through steric clash with the rigid side chain of the inhibitor. Inhibitors with flexible side chains can avoid this clash and retain effectiveness against the mutant. However, other mutations such as N108S reversion confer resistance to flexible inhibitors. We designed and synthesized hybrid inhibitors with two structural types in a single molecule, which are effective against both wild-type and multiple mutants of P. falciparum through their selective target binding, as demonstrated by X-ray crystallography. Furthermore, the hybrid inhibitors can forestall the emergence of new resistant mutants, as shown by selection of mutants resistant to hybrid compound BT1 from a diverse PfDHFR random mutant library expressed in a surrogate bacterial system. These results show that it is possible to develop effective antifolate antimalarials to which the range of parasite resistance mutations is greatly reduced.


    Organizational Affiliation

    National Center for Genetic Engineering and Biotechnology, National Science and Technology Development Agency, Pathumthani 12120, Thailand.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Bifunctional dihydrofolate reductase-thymidylate synthaseA, B608Plasmodium falciparumMutation(s): 0 
Gene Names: DHFR-TSV1/S
UniProt
Find proteins for D9N170 (Plasmodium falciparum)
Explore D9N170 
Go to UniProtKB:  D9N170
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupD9N170
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NAP
Query on NAP

Download Ideal Coordinates CCD File 
D [auth A],
G [auth B]
NADP NICOTINAMIDE-ADENINE-DINUCLEOTIDE PHOSPHATE
C21 H28 N7 O17 P3
XJLXINKUBYWONI-NNYOXOHSSA-N
 Ligand Interaction
9QR
Query on 9QR

Download Ideal Coordinates CCD File 
C [auth A],
F [auth B]
5-(4-{3-[(2,4-diamino-6-ethylpyrimidin-5-yl)oxy]propoxy}phenyl)-6-ethylpyrimidine-2,4-diamine
C21 H28 N8 O2
VSAKYGGFYNIPDW-UHFFFAOYSA-N
 Ligand Interaction
UMP
Query on UMP

Download Ideal Coordinates CCD File 
E [auth A],
H [auth B]
2'-DEOXYURIDINE 5'-MONOPHOSPHATE
C9 H13 N2 O8 P
JSRLJPSBLDHEIO-SHYZEUOFSA-N
 Ligand Interaction
Binding Affinity Annotations 
IDSourceBinding Affinity
9QR Binding MOAD:  6A2N Ki: 6.96 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.45 Å
  • R-Value Free: 0.291 
  • R-Value Work: 0.203 
  • R-Value Observed: 0.208 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 59.706α = 90
b = 157.107β = 90
c = 166.426γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
HKL-2000data scaling
PDB_EXTRACTdata extraction
HKL-2000data reduction
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Bill & Melinda Gates FoundationUnited States52992

Revision History  (Full details and data files)

  • Version 1.0: 2019-04-24
    Type: Initial release