1CZ3

DIHYDROFOLATE REDUCTASE FROM THERMOTOGA MARITIMA


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.255 
  • R-Value Work: 0.203 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The crystal structure of dihydrofolate reductase from Thermotoga maritima: molecular features of thermostability.

Dams, T.Auerbach, G.Bader, G.Jacob, U.Ploom, T.Huber, R.Jaenicke, R.

(2000) J.Mol.Biol. 297: 659-672

  • DOI: 10.1006/jmbi.2000.3570
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Two high-resolution structures have been obtained for dihydrofolate reductase from the hyperthermophilic bacterium Thermotoga maritima in its unliganded state, and in its ternary complex with the cofactor NADPH and the inhibitor, methotrexate. While ...

    Two high-resolution structures have been obtained for dihydrofolate reductase from the hyperthermophilic bacterium Thermotoga maritima in its unliganded state, and in its ternary complex with the cofactor NADPH and the inhibitor, methotrexate. While the overall fold of the hyperthermophilic enzyme is closely similar to monomeric mesophilic dihydrofolate reductase molecules, its quaternary structure is exceptional, in that T. maritima dihydrofolate reductase forms a highly stable homodimer. Here, the molecular reasons for the high intrinsic stability of the enzyme are elaborated and put in context with the available data on the physical parameters governing the folding reaction. The molecule is extremely rigid, even with respect to structural changes during substrate binding and turnover. Subunit cooperativity can be excluded from structural and biochemical data. Major contributions to the high intrinsic stability of the enzyme result from the formation of the dimer. Within the monomer, only subtle stabilizing interactions are detectable, without clear evidence for any of the typical increments of thermal stabilization commonly reported for hyperthermophilic proteins. The docking of the subunits is optimized with respect to high packing density in the dimer interface, additional salt-bridges and beta-sheets. The enzyme does not show significant structural changes upon binding its coenzyme, NADPH, and the inhibitor, methotrexate. The active-site loop, which is known to play an important role in catalysis in mesophilic dihydrofolate reductase molecules, is rearranged, participating in the association of the subunits; it no longer participates in catalysis.


    Organizational Affiliation

    Institut für Biophysik und physikalische Biochemie, Regensburg, 93040, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
DIHYDROFOLATE REDUCTASE
A, B
168Thermotoga maritima (strain ATCC 43589 / MSB8 / DSM 3109 / JCM 10099)Mutation(s): 0 
Gene Names: folA (dyrA)
EC: 1.5.1.3
Find proteins for Q60034 (Thermotoga maritima (strain ATCC 43589 / MSB8 / DSM 3109 / JCM 10099))
Go to UniProtKB:  Q60034
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
A, B
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.255 
  • R-Value Work: 0.203 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 131.605α = 90.00
b = 36.051β = 130.69
c = 97.025γ = 90.00
Software Package:
Software NamePurpose
CCP4data scaling
AMoREphasing
CNSrefinement
MOSFLMdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2000-03-31
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance