1GUZ

Structural Basis for Thermophilic Protein Stability: Structures of Thermophilic and Mesophilic Malate Dehydrogenases


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.292 
  • R-Value Work: 0.243 
  • R-Value Observed: 0.243 

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Literature

Structural Basis for Thermophilic Protein Stability: Structures of Thermophilic and Mesophilic Malate Dehydrogenases

Dalhus, B.Saarinen, M.Sauer, U.H.Eklund, P.Johansson, K.Karlsson, A.Ramaswamy, S.Bjork, A.Synstad, B.Naterstad, K.Sirevag, R.Eklund, H.

(2002) J Mol Biol 318: 707

  • DOI: https://doi.org/10.1016/S0022-2836(02)00050-5
  • Primary Citation of Related Structures:  
    1GUY, 1GUZ, 1GV0, 1GV1

  • PubMed Abstract: 

    The three-dimensional structure of four malate dehydrogenases (MDH) from thermophilic and mesophilic phototropic bacteria have been determined by X-ray crystallography and the corresponding structures compared. In contrast to the dimeric quaternary structure of most MDHs, these MDHs are tetramers and are structurally related to tetrameric malate dehydrogenases from Archaea and to lactate dehydrogenases. The tetramers are dimers of dimers, where the structures of each subunit and the dimers are similar to the dimeric malate dehydrogenases. The difference in optimal growth temperature of the corresponding organisms is relatively small, ranging from 32 to 55 degrees C. Nevertheless, on the basis of the four crystal structures, a number of factors that are likely to contribute to the relative thermostability in the present series have been identified. It appears from the results obtained, that the difference in thermostability between MDH from the mesophilic Chlorobium vibrioforme on one hand and from the moderate thermophile Chlorobium tepidum on the other hand is mainly due to the presence of polar residues that form additional hydrogen bonds within each subunit. Furthermore, for the even more thermostable Chloroflexus aurantiacus MDH, the use of charged residues to form additional ionic interactions across the dimer-dimer interface is favored. This enzyme has a favorable intercalation of His-Trp as well as additional aromatic contacts at the monomer-monomer interface in each dimer. A structural alignment of tetrameric and dimeric prokaryotic MDHs reveal that structural elements that differ among dimeric and tetrameric MDHs are located in a few loop regions.


  • Organizational Affiliation

    Department of Chemistry, University of Oslo, Box 1033, Blindern, N-0316 Oslo, Norway.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
MALATE DEHYDROGENASE
A, B, C, D
310Prosthecochloris vibrioformisChlorobaculum tepidum
This entity is chimeric
Mutation(s): 0 
EC: 1.1.1.37
UniProt
Find proteins for P80039 (Chlorobaculum tepidum (strain ATCC 49652 / DSM 12025 / NBRC 103806 / TLS))
Explore P80039 
Go to UniProtKB:  P80039
Find proteins for P0C890 (Prosthecochloris vibrioformis)
Explore P0C890 
Go to UniProtKB:  P0C890
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupsP80039P0C890
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.292 
  • R-Value Work: 0.243 
  • R-Value Observed: 0.243 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 83.89α = 90
b = 117.39β = 90
c = 125.33γ = 90
Software Package:
Software NamePurpose
CNSrefinement
MOSFLMdata reduction
SCALAdata scaling
AMoREphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Revision History  (Full details and data files)

  • Version 1.0: 2002-02-21
    Type: Initial release
  • Version 1.1: 2015-11-11
    Changes: Derived calculations, Other, Refinement description, Source and taxonomy, Version format compliance
  • Version 1.2: 2017-03-15
    Changes: Source and taxonomy
  • Version 1.3: 2019-07-24
    Changes: Data collection
  • Version 1.4: 2024-05-08
    Changes: Data collection, Database references, Derived calculations, Other