Biological Assembly 1  

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Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Hetero 4-mer - A2B2 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 146588.83 
• Atom Count: 9347 
• Residue Count: 1216 
• Unique protein chains: 2

1J3I

Wild-type Plasmodium falciparum dihydrofolate reductase-thymidylate synthase (PfDHFR-TS) complexed with WR99210, NADPH, and dUMP

• DOI: 10.2210/pdb1J3I/pdb

• Classification: OXIDOREDUCTASE TRANSFERASE
• Organism(s): Plasmodium falciparum (isolate K1 / Thailand)
• Expression System: Escherichia coli BL21(DE3)


• Deposited: 2003-02-03 Released: 2003-05-06 
• Deposition Author(s): Yuvaniyama, J., Chitnumsub, P., Kamchonwongpaisan, S., Vanichtanankul, J., Sirawaraporn, W., Taylor, P., Walkinshaw, M., Yuthavong, Y.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.33 Å
• R-Value Free: 0.236 
• R-Value Work: 0.185 

Literature

Insights into antifolate resistance from malarial DHFR-TS structures.

Yuvaniyama, J., Chitnumsub, P., Kamchonwongpaisan, S., Vanichtanankul, J., Sirawaraporn, W., Taylor, P., Walkinshaw, M.D., Yuthavong, Y.

(2003) Nat.Struct.Mol.Biol. 10: 357-365

• PubMed: 12704428 
• DOI: 10.1038/nsb921
• Primary Citation of Related Structures:  
  1J3K, 1J3J


• PubMed Abstract: 
  

Plasmodium falciparum dihydrofolate reductase-thymidylate synthase (PfDHFR-TS) is an important target of antimalarial drugs. The efficacy of this class of DHFR-inhibitor drugs is now compromised because of mutations that prevent drug binding yet retain enzyme activity. The crystal structures of PfDHFR-TS from the wild type (TM4/8.2) and the quadruple drug-resistant mutant (V1/S) strains, in complex with a potent inhibitor WR99210, as well as the resistant double mutant (K1 CB1) with the antimalarial pyrimethamine, reveal features for overcoming resistance. In contrast to pyrimethamine, the flexible side chain of WR99210 can adopt a conformation that fits well in the active site, thereby contributing to binding. The single-chain bifunctional PfDHFR-TS has a helical insert between the DHFR and TS domains that is involved in dimerization and domain organization. Moreover, positively charged grooves on the surface of the dimer suggest a function in channeling of substrate from TS to DHFR active sites. These features provide possible approaches for the design of new drugs to overcome antifolate resistance.

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Organizational Affiliation: 

Department of Biochemistry, Faculty of Science, Mahidol University, Rama 6 Road, Bangkok 10400, Thailand.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Bifunctional dihydrofolate reductase-thymidylate synthase	A, B	280	Plasmodium falciparum (isolate K1 / Thailand)	Mutation(s): 0
Find proteins for P13922 (Plasmodium falciparum (isolate K1 / Thailand)) Go to UniProtKB:  P13922

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details
Bifunctional dihydrofolate reductase-thymidylate synthase	C, D	328	Plasmodium falciparum (isolate K1 / Thailand)	Mutation(s): 0
Find proteins for P13922 (Plasmodium falciparum (isolate K1 / Thailand)) Go to UniProtKB:  P13922

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
WRA	A, B	6,6-DIMETHYL-1-[3-(2,4,5-TRICHLOROPHENOXY)PROPOXY]-1,6-DIHYDRO-1,3,5-TRIAZINE-2,4-DIAMINE 4,6-DIAMINO-1,2-DIHYDRO-2,2-DIMETHYL-1-[(2,4,5-TRICHLOROPHENOXY)PROPYLOXY]-1,3,5-TRIAZINE C14 H18 Cl3 N5 O2 MJZJYWCQPMNPRM-UHFFFAOYSA-N
UMP	C, D	2'-DEOXYURIDINE 5'-MONOPHOSPHATE DUMP C9 H13 N2 O8 P JSRLJPSBLDHEIO-SHYZEUOFSA-N
NDP	A, B	NADPH DIHYDRO-NICOTINAMIDE-ADENINE-DINUCLEOTIDE PHOSPHATE C21 H30 N7 O17 P3 ACFIXJIJDZMPPO-NNYOXOHSSA-N

External Ligand Annotations
ID	Binding Affinity (Sequence Identity %)
WRA	IC50: 0.6 - 18 nM (100) BINDINGDB
WRA	Ki: 0 - 0.5 nM (100) BINDINGDB
WRA	Ki: 0.011 nM BINDINGMOAD

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.33 Å
• R-Value Free: 0.236 
• R-Value Work: 0.185 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length (Å)	Angle (°)
a = 59.117	α = 90.00
b = 157.249	β = 90.00
c = 165.443	γ = 90.00

Software Package:

Software Name	Purpose
DENZO	data reduction
AMoRE	phasing
CNS	refinement
SCALEPACK	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2003-02-03 
• Released Date: 2003-05-06 
• Deposition Author(s): Yuvaniyama, J., Chitnumsub, P., Kamchonwongpaisan, S., Vanichtanankul, J., Sirawaraporn, W., Taylor, P., Walkinshaw, M., Yuthavong, Y.

Revision History 

• Version 1.0: 2003-05-06
  Type: Initial release
• Version 1.1: 2008-04-27
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance