3CP2

Crystal structure of GidA from E. coli


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.9 Å
  • R-Value Free: 0.313 
  • R-Value Work: 0.246 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

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: 10.1016/j.jmb.2008.04.072
  • Primary Citation of Related Structures:  

  • 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 ...

    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.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
tRNA uridine 5-carboxymethylaminomethyl modification enzyme gidA
A
649Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: mnmG (gidA, trmF)
Find proteins for P0A6U3 (Escherichia coli (strain K12))
Go to UniProtKB:  P0A6U3
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

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

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.9 Å
  • R-Value Free: 0.313 
  • R-Value Work: 0.246 
  • Space Group: P 65 2 2
Unit Cell:
Length (Å)Angle (°)
a = 197.600α = 90.00
b = 197.600β = 90.00
c = 69.160γ = 120.00
Software Package:
Software NamePurpose
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2008-06-24
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance