1DRB

CRYSTAL STRUCTURE OF UNLIGANDED ESCHERICHIA COLI DIHYDROFOLATE REDUCTASE. LIGAND-INDUCED CONFORMATIONAL CHANGES AND COOPERATIVITY IN BINDING


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.96 Å

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Crystal structure of unliganded Escherichia coli dihydrofolate reductase. Ligand-induced conformational changes and cooperativity in binding.

Bystroff, C.Kraut, J.

(1991) Biochemistry 30: 2227-2239

  • Primary Citation of Related Structures:  1DRA, 5DFR

  • PubMed Abstract: 
  • The crystal structure of unliganded dihydrofolate reductase (DHFR) from Escherichia coli has been solved and refined to an R factor of 19% at 2.3-A resolution in a crystal form that is nonisomorphous with each of the previously reported E. coli DHFR ...

    The crystal structure of unliganded dihydrofolate reductase (DHFR) from Escherichia coli has been solved and refined to an R factor of 19% at 2.3-A resolution in a crystal form that is nonisomorphous with each of the previously reported E. coli DHFR crystal structures [Bolin, J. T., Filman, D. J., Matthews, D. A., Hamlin, B. C., & Kraut, J. (1982) J. Biol. Chem. 257, 13650-13662; Bystroff, C., Oatley, S. J., & Kraut, J. (1990) Biochemistry 29, 3263-3277]. Significant conformational changes occur between the apoenzyme and each of the complexes: the NADP+ holoenzyme, the folate-NADP+ ternary complex, and the methotrexate (MTX) binary complex. The changes are small, with the largest about 3 A and most of them less than 1 A. For simplicity a two-domain description is adopted in which one domain contains the NADP+ 2'-phosphate binding site and the binding sites for the rest of the coenzyme and for the substrate lie between the two domains. Binding of either NADP+ or MTX induces a closing of the PABG-binding cleft and realignment of alpha-helices C and F which bind the pyrophosphate of the coenzyme. Formation of the ternary complex from the holoenzyme does not involve further relative domain shifts but does involve a shift of alpha-helix B and a floppy loop (the Met-20 loop) that precedes alpha B. These observations suggest a mechanism for cooperativity in binding between substrate and coenzyme wherein the greatest degree of cooperativity is expressed in the transition-state complex. We explore the idea that the MTX binary complex in some ways resembles the transition-state complex.


    Related Citations: 
    • Functional Role of Aspartic Acid-27 in Dihydrofolate Reductase Revealed by Mutagenesis
      Howell, E.E.,Villafranca, J.E.,Warren, M.S.,Oatley, S.J.,Kraut, J.
      (1986) Science 231: 1123
    • Crystal Structures of Escherichia Coli and Lactobacillus Casei Dihydrofolate Reductase Refined at 1.7 Angstroms Resolution. I. General Features and Binding of Methotrexate
      Bolin, J.T.,Filman, D.J.,Matthews, D.A.,Hamlin, R.C.,Kraut, J.
      (1982) J.Biol.Chem. 257: 13650
    • Crystal Structures of Escherichia Coli and Lactobacillus Casei Dihydrofolate Reductase Refined at 1.7 Angstroms Resolution. II. Environment of Bound Nadph and Implications for Catalysis
      Filman, D.J.,Bolin, J.T.,Matthews, D.A.,Kraut, J.
      (1982) J.Biol.Chem. 257: 13663
    • Crystal Structures of Recombinant Human Dihydrofolate Reductase Complexed with Folate and 5-Deazafolate
      Davies II, J.F.,Delcamp, T.J.,Prendergast, N.J.,Ashford, V.A.,Freisheim, J.H.,Kraut, J.
      (1990) Biochemistry 29: 9467
    • Crystal Structures of Escherichia Coli Dihydrofolate Reductase: The Nadp+ Holoenzyme and the Folate Nadp+ Ternary Complex. Substrate Binding and a Model for the Transition State
      Bystroff, C.,Oatley, S.J.,Kraut, J.
      (1990) Biochemistry 29: 3263


    Organizational Affiliation

    Department of Chemistry, University of California, San Diego, La Jolla 92093.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
DIHYDROFOLATE REDUCTASE
A, B
159Escherichia coli (strain K12)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

Download SDF File 
Download CCD File 
A, B
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
CA
Query on CA

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Download CCD File 
B
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
MTX
Query on MTX

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

Download SDF File 
Download CCD File 
A, B
ETHANOL
C2 H6 O
LFQSCWFLJHTTHZ-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
MTXEC50: 1 nM (98) BINDINGDB
MTXIC50: 3 - 8.8 nM (98) BINDINGDB
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.96 Å
  • Space Group: P 61
Unit Cell:
Length (Å)Angle (°)
a = 92.840α = 90.00
b = 92.840β = 90.00
c = 74.240γ = 120.00
Software Package:
Software NamePurpose
PROLSQrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 1991-11-06 
  • Released Date: 1994-01-31 
  • Deposition Author(s): David, C., Kraut, J.

Revision History 

  • Version 1.0: 1994-01-31
    Type: Initial release
  • Version 1.1: 2008-03-03
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-11-29
    Type: Derived calculations, Other