1TDR

EXPRESSION, CHARACTERIZATION, AND CRYSTALLOGRAPHIC ANALYSIS OF TELLUROMETHIONYL DIHYDROFOLATE REDUCTASE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Observed: 0.124 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Expression, characterization and crystallographic analysis of telluromethionyl dihydrofolate reductase.

Boles, J.O.Lewinski, K.Kunckle, M.G.Hatada, M.Lebioda, L.Dunlap, R.B.Odom, J.D.

(1995) Acta Crystallogr D Biol Crystallogr 51: 731-739

  • DOI: 10.1107/S0907444995001156
  • Primary Citation of Related Structures:  
    1TDR

  • PubMed Abstract: 
  • Selenomethionine-containing proteins analyzed by multi-wavelength anomalous diffraction provide a facile means of addressing the phase problem, whose solution is necessary to determine protein structures by X-ray crystallography [Hendrickson (1991). Science, 254, 51-58] ...

    Selenomethionine-containing proteins analyzed by multi-wavelength anomalous diffraction provide a facile means of addressing the phase problem, whose solution is necessary to determine protein structures by X-ray crystallography [Hendrickson (1991). Science, 254, 51-58]. Since this method requires synchrotron radiation, we sought to incorporate a true heavy atom into protein, allowing the solution of the phase problem by more traditional methods of data collection. Media containing TeMet alone or TeMet with low levels of Met failed to sustain growth of a methione auxotroph of Escherichia coli carrying the dihydrofolate reductase expression vector. Growth of the organism to stationary phase and incorporation of TeMet was observed when the culture was initiated in media containing minimal Met levels and TeMet was added after induction with isopropyl-1-thio-beta-D-galactopyranoside. The purified enzyme exhibited properties similar to those of the native enzyme. Atomic absorption spectroscopy and amino-acid analysis indicated that 40% of the methionines were replaced with TeMet. Sequence analysis did not indicate significant levels of replacement in the first three sites (1, 16 and 20), suggesting that TeMet was present only in the last two sites (42 and 92). Crystals of this enzyme were grown in the presence of methotrexate and were isomorphous with crystals of wild-type dihydrofolate reductase. Difference Fourier maps and restrained least-squares refinement showed no substitution at the first three methionines, while incorporation was seen at positions 42 and 92.


    Related Citations: 
    • Bio-Incorporation of Telluromethionine Into Buried Residues of Dihydrofolate Reductase
      Boles, J.O., Lewinski, K., Kunkle, M., Odom, J.D., Dunlap, R.B., Lebioda, L., Hatada, M.
      (1994) Nat Struct Biol 1: 283

    Organizational Affiliation

    Department of Chemistry, Tennessee Technological University, Cookeville, TN 38505, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
TELLUROMETHIONYL DIHYDROFOLATE REDUCTASEA, B159Escherichia coliMutation(s): 0 
EC: 1.5.1.3
UniProt
Find proteins for P0ABQ4 (Escherichia coli (strain K12))
Explore P0ABQ4 
Go to UniProtKB:  P0ABQ4
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0ABQ4
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Binding Affinity Annotations 
IDSourceBinding Affinity
MTX BindingDB:  1TDR IC50: min: 3, max: 8.8 (nM) from 3 assay(s)
EC50: 1 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Observed: 0.124 
  • Space Group: P 61
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 93α = 90
b = 93β = 90
c = 74.4γ = 120
Software Package:
Software NamePurpose
MADNESdata collection
PROCORdata collection
PROLSQrefinement
MADNESdata reduction
PROCORdata reduction

Structure Validation

View Full Validation Report




Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1995-07-10
    Type: Initial release
  • Version 1.1: 2008-03-21
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance