Crystal structure of GidA from Chlorobium tepidum

Experimental Data Snapshot

  • Resolution: 3.20 Å
  • R-Value Free: 0.278 
  • R-Value Work: 0.254 
  • R-Value Observed: 0.256 

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Crystal structures of the conserved tRNA-modifying enzyme GidA: implications for its interaction with MnmE and substrate

Meyer, S.Scrima, A.Versees, W.Wittinghofer, A.

(2008) J Mol Biol 380: 532-547

  • DOI: https://doi.org/10.1016/j.jmb.2008.04.072
  • Primary Citation of Related Structures:  
    3CP2, 3CP8

  • PubMed Abstract: 

    GidA is a flavin-adenine-dinucleotide (FAD)-binding protein that is conserved among bacteria and eucarya. Together with MnmE, it is involved in the addition of a carboxymethylaminomethyl group to the uridine base in the wobble position (nucleotide 34) of tRNAs that read split codon boxes. Here, we report the crystal structures of the GidA proteins from both Escherichia coli and Chlorobium tepidum. The structures show that the protein can be divided into three domains: a first FAD-binding domain showing the classical Rossmann fold, a second alpha/beta domain inserted between two strands of the Rossmann fold, and an alpha-helical C-terminal domain. The domain inserted into the Rossmann fold displays structural similarity to the nicotinamide-adenine-dinucleotide-(phosphate)-binding domains of phenol hydroxylase and 3-hydroxy-3-methylglutaryl-CoA reductase, and, correspondingly, we show that GidA binds NADH with high specificity as an initial donor of electrons. GidA behaves as a homodimer in solution. As revealed by the crystal structures, homodimerization is mediated via both the FAD-binding domain and the NADH-binding domain. Finally, a large patch of highly conserved, positively charged residues on the surface of GidA leading to the FAD-binding site suggests a tRNA-binding surface. We propose a model for the interaction between GidA and MnmE, which is supported by site-directed mutagenesis. Our data suggest that this interaction is modulated and potentially regulated by the switch function of the G domain of MnmE.

  • Organizational Affiliation

    Department of Structural Biology, Max-Planck-Institute of Molecular Physiology, Otto-Hahn-Strasse 11, Dortmund 44227, Germany.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
tRNA uridine 5-carboxymethylaminomethyl modification enzyme gidA
A, B, C, D
641N/AMutation(s): 0 
Gene Names: CT2283
EC: 1
Find proteins for Q8KA85 (Chlorobaculum tepidum (strain ATCC 49652 / DSM 12025 / NBRC 103806 / TLS))
Explore Q8KA85 
Go to UniProtKB:  Q8KA85
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8KA85
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 3.20 Å
  • R-Value Free: 0.278 
  • R-Value Work: 0.254 
  • R-Value Observed: 0.256 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 120.505α = 90
b = 71.836β = 91.82
c = 171.934γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2008-06-24
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2023-11-01
    Changes: Data collection, Database references, Derived calculations, Refinement description