1TDR

EXPRESSION, CHARACTERIZATION, AND CRYSTALLOGRAPHIC ANALYSIS OF TELLUROMETHIONYL DIHYDROFOLATE REDUCTASE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å

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.,Sect.D 51: 731-739

  • DOI: 10.1107/S0907444995001156

  • 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). ...

    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.Mol.Biol. 1: 283


    Organizational Affiliation

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




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
TELLUROMETHIONYL DIHYDROFOLATE REDUCTASE
A, B
159Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: folA (tmrA)
EC: 1.5.1.3
Find proteins for P0ABQ4 (Escherichia coli (strain K12))
Go to UniProtKB:  P0ABQ4
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CL
Query on CL

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

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B
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
TE
Query on TE

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A, B
TELLURIUM
Te
VTLHPSMQDDEFRU-UHFFFAOYSA-N
 Ligand Interaction
MTX
Query on MTX

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A, B
METHOTREXATE
C20 H22 N8 O5
FBOZXECLQNJBKD-ZDUSSCGKSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
MTXIC50: 3 - 8.8 nM (98) BINDINGDB
MTXEC50: 1 nM (98) BINDINGDB
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • Space Group: P 61
Unit Cell:
Length (Å)Angle (°)
a = 93.000α = 90.00
b = 93.000β = 90.00
c = 74.400γ = 120.00
Software Package:
Software NamePurpose
MADNESdata reduction
PROLSQrefinement
PROCORdata collection
PROCORdata reduction
MADNESdata collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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