Experimental Data Snapshot

  • Resolution: 1.70 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.198 
  • R-Value Observed: 0.198 

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This is version 1.3 of the entry. See complete history


Formylmethanofuran: tetrahydromethanopterin formyltransferase from Methanopyrus kandleri - new insights into salt-dependence and thermostability.

Ermler, U.Merckel, M.Thauer, R.Shima, S.

(1997) Structure 5: 635-646

  • DOI: https://doi.org/10.1016/s0969-2126(97)00219-0
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Formylmethanofuran: tetrahydromethanopterin formyltransferase (Ftr) from the methanogenic Archaeon Methanopyrus kandleri (optimum growth temperature 98 degrees C) is a hyperthermophilic enzyme that is absolutely dependent on the presence of lyotropic salts for activity and thermostability. The enzyme is involved in the pathway of carbon dioxide reduction to methane and catalyzes the transfer of formyl from formylmethanofuran to tetrahydromethanopterin. The crystal structure of Ftr, determined to a resolution of 1:73 AE reveals a homotetramer composed essentially of two dimers. Each subunit is subdivided into two tightly associated lobes both consisting of a predominantly antiparallel beta sheet flanked by alpha helices forming an alpha/beta sandwich structure. The approximate location of the active site was detected in a region close to the dimer interface. The adaptation of Ftr against high lyotropic salt concentrations is structurally reflected by a large number of negatively charged residues and their high local concentration on the surface of the protein. The salt-dependent thermostability of Ftr might be explained on a molecular basis by ionic interactions at the protein surface, involving both protein and inorganic salt ions, and the mainly hydrophobic interactions between the subunits and within the core.

  • Organizational Affiliation

    Max-Planck-Institut für Biophysik, Heinrich-Hoffmann-Strasse 7, 60528 Frankfurt, Germany. ermler@max.mpibp.uni-frankfurt.de

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B, C, D
296Methanopyrus kandleriMutation(s): 0 
Gene Names: FTR
Find proteins for Q49610 (Methanopyrus kandleri (strain AV19 / DSM 6324 / JCM 9639 / NBRC 100938))
Explore Q49610 
Go to UniProtKB:  Q49610
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ49610
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.70 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.198 
  • R-Value Observed: 0.198 
  • Space Group: I 41 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 157.5α = 90
b = 157.5β = 90
c = 242.1γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
CCP4data scaling
Agrovatadata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1998-10-14
    Type: Initial release
  • Version 1.1: 2008-03-24
    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, Refinement description