3F8Y

Correlations of Human Dihydrofolate Reductase with Structural Data for Human Active Site Mutant Enzyme Complexes


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.45 Å
  • R-Value Free: 0.228 
  • R-Value Work: 0.190 
  • R-Value Observed: 0.192 

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This is version 1.5 of the entry. See complete history


Literature

Correlations of Inhibitor Kinetics for Pneumocystis jirovecii and Human Dihydrofolate Reductase with Structural Data for Human Active Site Mutant Enzyme Complexes.

Cody, V.Pace, J.Makin, J.Piraino, J.Queener, S.F.Rosowsky, A.

(2009) Biochemistry 48: 1702-1711

  • DOI: https://doi.org/10.1021/bi801960h
  • Primary Citation of Related Structures:  
    3F8Y, 3F8Z, 3F91, 3FS6

  • PubMed Abstract: 

    To understand the role of specific active site residues in conferring selective dihydrofolate reductase (DHFR) inhibition from pathogenic organisms such as Pneumocystis carinii (pc) or Pneumocystis jirovecii (pj), the causative agent in AIDS pneumonia, it is necessary to evaluate the role of these residues in the human enzyme. We report the first kinetic parameters for DHFR from pjDHFR and pcDHFR with methotrexate (MTX), trimethoprim (TMP), and its potent analogue, PY957. We also report the mutagenesis and kinetic analysis of active site mutant proteins at positions 35 and 64 of human (h) DHFR and the crystal structure determinations of hDHFR ternary complexes of NADPH and PY957 with the wild-type DHFR enzyme, the single mutant protein, Gln35Lys, and two double mutant proteins, Gln35Ser/Asn64Ser and Gln35Ser/Asn64Phe. These substitutions place into human DHFR amino acids found at those sites in the opportunistic pathogens pcDHFR (Q35K/N64F) and pjDHFR (Q35S/N64S). The K(i) inhibition constant for PY957 showed greatest potency of the compound for the N64F single mutant protein (5.2 nM), followed by wild-type pcDHFR (K(i) 22 nM) and then wild-type hDHFR enzyme (K(i) 230 nM). Structural data reveal significant conformational changes in the binding interactions of PY957 in the hDHFR Q35S/N64F mutant protein complex compared to the other hDHFR mutant protein complexes and the pcDHFR ternary complex. The conformation of PY957 in the wild-type DHFR is similar to that observed for the single mutant protein. These data support the hypothesis that the enhanced selectivity of PY957 for pcDHFR is in part due to the contributions at positions 37 and 69 (pcDHFR numbering). This insight will help in the design of more selective inhibitors that target these opportunistic pathogens.


  • Organizational Affiliation

    Structural Biology Department, Hauptman-Woodward Medical Research Institute, 700 Ellicott Street, Buffalo, New York 14203, USA. cody@hwi.buffalo.edu


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Dihydrofolate reductase187Homo sapiensMutation(s): 1 
Gene Names: DHFRDHFRP1
EC: 1.5.1.3
UniProt & NIH Common Fund Data Resources
Find proteins for P00374 (Homo sapiens)
Explore P00374 
Go to UniProtKB:  P00374
PHAROS:  P00374
GTEx:  ENSG00000228716 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP00374
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Binding Affinity Annotations 
IDSourceBinding Affinity
DH1 Binding MOAD:  3F8Y Ki: 8.3 (nM) from 1 assay(s)
BindingDB:  3F8Y IC50: min: 4.4, max: 8000 (nM) from 5 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.45 Å
  • R-Value Free: 0.228 
  • R-Value Work: 0.190 
  • R-Value Observed: 0.192 
  • Space Group: H 3
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 84.294α = 90
b = 84.294β = 90
c = 78.117γ = 120
Software Package:
Software NamePurpose
HKL-2000data collection
MOLREPphasing
REFMACrefinement
HKL-2000data reduction
SCALAdata scaling

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-08-18
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2014-04-30
    Changes: Data collection
  • Version 1.3: 2017-11-01
    Changes: Refinement description
  • Version 1.4: 2021-10-20
    Changes: Database references, Derived calculations
  • Version 1.5: 2023-09-06
    Changes: Data collection, Refinement description