3HJ3

Crystal Structure of the ChTS-DHFR F207A Non-Active Site Mutant


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.7 Å
  • R-Value Free: 0.274 
  • R-Value Work: 0.228 

wwPDB Validation 3D Report Full Report


This is version 1.5 of the entry. See complete history

Literature

Exploring novel strategies for AIDS protozoal pathogens: alpha-helix mimetics targeting a key allosteric protein-protein interaction in C. hominis TS-DHFR.

Martucci, W.E.Rodriguez, J.M.Vargo, M.A.Marr, M.Hamilton, A.D.Anderson, K.S.

(2013) Medchemcomm 4: 1247-1256

  • DOI: 10.1039/C3MD00141E

  • PubMed Abstract: 
  • The bifunctional enzyme thymidylate synthase-dihydrofolate reductase (TS-DHFR) from the protozoal parasite <i>Cryptosporidium hominis </i> is a potential molecular target for the design of antiparasitic therapies for AIDS-related opportunistic infec ...

    The bifunctional enzyme thymidylate synthase-dihydrofolate reductase (TS-DHFR) from the protozoal parasite Cryptosporidium hominis is a potential molecular target for the design of antiparasitic therapies for AIDS-related opportunistic infections. The enzyme exists as a homodimer with each monomer containing a unique swap domain known as a "crossover helix" that binds in a cleft on the adjacent DHFR active site. This crossover helix is absent in species containing monofunctional forms of DHFR such as human. An in-depth understanding of protein-protein interactions between the crossover helix and adjacent DHFR active site that might modulate enzyme integrity or function would allow for insights into rational design of species-specific allosteric inhibitors. Mutational analysis coupled with structural studies and biophysical and kinetic characterization of crossover helix mutants identifies this domain as essential for full enzyme stability and catalytic activity, and pinpoints these effects to distinct faces of the crossover helix important in protein-protein interactions. Moreover, targeting this helical protein interaction with α-helix mimetics of the crossover helix leads to selective inhibition and destabilization of the C. hominis TS-DHFR enzyme, thus validating this region as a new avenue to explore for species-specific inhibitor design.


    Organizational Affiliation

    Department of Molecular Biophysics and Biochemistry, Yale University School of Medicine, 333 Cedar Street, New Haven, Connecticut 06520, USA ; Department of Pharmacology, Yale University School of Medicine, 333 Cedar Street, New Haven, Connecticut 06520, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Chain A, crystal structure of Dhfr
A, B, C, D
521N/AMutation(s): 1 
Protein Feature View is not available: No corresponding UniProt sequence found.
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CB3
Query on CB3

Download SDF File 
Download CCD File 
A, B, C
10-PROPARGYL-5,8-DIDEAZAFOLIC ACID
C24 H23 N5 O6
LTKHPMDRMUCUEB-IBGZPJMESA-N
 Ligand Interaction
MTX
Query on MTX

Download SDF File 
Download CCD File 
A, B, C, D
METHOTREXATE
C20 H22 N8 O5
FBOZXECLQNJBKD-ZDUSSCGKSA-N
 Ligand Interaction
UMP
Query on UMP

Download SDF File 
Download CCD File 
A, B, C
2'-DEOXYURIDINE 5'-MONOPHOSPHATE
DUMP
C9 H13 N2 O8 P
JSRLJPSBLDHEIO-SHYZEUOFSA-N
 Ligand Interaction
NDP
Query on NDP

Download SDF File 
Download CCD File 
A, B, C, D
NADPH DIHYDRO-NICOTINAMIDE-ADENINE-DINUCLEOTIDE PHOSPHATE
C21 H30 N7 O17 P3
ACFIXJIJDZMPPO-NNYOXOHSSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.7 Å
  • R-Value Free: 0.274 
  • R-Value Work: 0.228 
  • Space Group: P 32 2 1
Unit Cell:
Length (Å)Angle (°)
a = 121.860α = 90.00
b = 121.860β = 90.00
c = 342.352γ = 120.00
Software Package:
Software NamePurpose
AMoREphasing
HKL-2000data reduction
CNSrefinement
REFMACrefinement
HKL-2000data collection
HKL-2000data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-06-02
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance
  • Version 1.2: 2013-09-04
    Type: Database references
  • Version 1.3: 2014-01-15
    Type: Database references
  • Version 1.4: 2019-07-24
    Type: Data collection, Refinement description
  • Version 1.5: 2019-08-14
    Type: Data collection