Experimental Data Snapshot

  • Resolution: 2.10 Å
  • R-Value Free: 0.255 
  • R-Value Work: 0.203 
  • R-Value Observed: 0.203 

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This is version 1.3 of the entry. See complete history


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: https://doi.org/10.1006/jmbi.2000.3570
  • Primary Citation of Related Structures:  
    1CZ3, 1D1G

  • 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 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.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
168Thermotoga maritimaMutation(s): 0 
Find proteins for Q60034 (Thermotoga maritima (strain ATCC 43589 / DSM 3109 / JCM 10099 / NBRC 100826 / MSB8))
Explore Q60034 
Go to UniProtKB:  Q60034
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ60034
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.10 Å
  • R-Value Free: 0.255 
  • R-Value Work: 0.203 
  • R-Value Observed: 0.203 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 131.605α = 90
b = 36.051β = 130.69
c = 97.025γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
CCP4data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2000-03-31
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2024-02-07
    Changes: Data collection, Database references, Derived calculations