4KBN

human dihydrofolate reductase complexed with NADPH and 5-{3-[3-(3,5-pyrimidine)]-phenyl-prop-1-yn-1-yl}-6-ethyl-pyrimidine-2,4diamine


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.84 Å
  • R-Value Free: 0.277 
  • R-Value Work: 0.227 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Elucidating features that drive the design of selective antifolates using crystal structures of human dihydrofolate reductase.

Lamb, K.M.G-Dayanandan, N.Wright, D.L.Anderson, A.C.

(2013) Biochemistry 52: 7318-7326

  • DOI: 10.1021/bi400852h
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The pursuit of antimicrobial drugs that target dihydrofolate reductase (DHFR) exploits differences in sequence and dynamics between the pathogenic and human enzymes. Here, we present five crystal structures of human DHFR bound to a new class of antim ...

    The pursuit of antimicrobial drugs that target dihydrofolate reductase (DHFR) exploits differences in sequence and dynamics between the pathogenic and human enzymes. Here, we present five crystal structures of human DHFR bound to a new class of antimicrobial agents, the propargyl-linked antifolates (PLAs), with a range of potency (IC50 values of 0.045-1.07 μM) for human DHFR. These structures reveal that interactions between the ligands and Asn 64, Phe 31, and Phe 34 are important for increased affinity for human DHFR and that loop residues 58-64 undergo ligand-induced conformational changes. The utility of these structural studies was demonstrated through the design of three new ligands that reduce the number of contacts with Asn 64, Phe 31, and Phe 34. Synthesis and evaluation show that one of the designed inhibitors exhibits the lowest affinity for human DHFR of any of the PLAs (2.64 μM). Comparisons of structures of human and Staphylococcus aureus DHFR bound to the same PLA reveal a conformational change in the ligand that enhances interactions with residues Phe 92 (Val 115 in huDHFR) and Ile 50 (Ile 60 in huDHFR) in S. aureus DHFR, yielding selectivity. Likewise, comparisons of human and Candida glabrata DHFR bound to the same ligand show that hydrophobic interactions with residues Ile 121 and Phe 66 (Val 115 and Asn 64 in human DHFR) yield selective inhibitors. The identification of residue substitutions that are important for selectivity and the observation of active site flexibility will help guide antimicrobial antifolate development for the inhibition of pathogenic species.


    Organizational Affiliation

    Department of Pharmaceutical Sciences, University of Connecticut , 69 North Eagleville Road, Storrs, Connecticut 06269, United States.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Dihydrofolate reductase
A, B
186Homo sapiensMutation(s): 0 
Gene Names: DHFR
EC: 1.5.1.3
Find proteins for P00374 (Homo sapiens)
Go to Gene View: DHFR
Go to UniProtKB:  P00374
Small Molecules
Ligands 7 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
25U
Query on 25U

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A, B
6-ethyl-5-{3-[3-(pyrimidin-5-yl)phenyl]prop-1-yn-1-yl}pyrimidine-2,4-diamine
C19 H18 N6
UEZKDWYIIOOENX-UHFFFAOYSA-N
 Ligand Interaction
CL
Query on CL

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A, B
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
MG
Query on MG

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A, B
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
NH4
Query on NH4

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B
AMMONIUM ION
H4 N
QGZKDVFQNNGYKY-UHFFFAOYSA-O
 Ligand Interaction
EOH
Query on EOH

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A, B
ETHANOL
C2 H6 O
LFQSCWFLJHTTHZ-UHFFFAOYSA-N
 Ligand Interaction
NDP
Query on NDP

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A, B
NADPH DIHYDRO-NICOTINAMIDE-ADENINE-DINUCLEOTIDE PHOSPHATE
C21 H30 N7 O17 P3
ACFIXJIJDZMPPO-NNYOXOHSSA-N
 Ligand Interaction
SR
Query on SR

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B
STRONTIUM ION
Sr
PWYYWQHXAPXYMF-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
25UIC50: 160 nM (100) BINDINGDB
25UIC50: 330 nM BINDINGMOAD
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.84 Å
  • R-Value Free: 0.277 
  • R-Value Work: 0.227 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 87.669α = 90.00
b = 93.784β = 90.00
c = 95.991γ = 90.00
Software Package:
Software NamePurpose
StructureStudiodata collection
PHENIXrefinement
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-10-09
    Type: Initial release
  • Version 1.1: 2013-10-30
    Type: Database references
  • Version 1.2: 2013-11-20
    Type: Non-polymer description