1WKF

TRNA-GUANINE TRANSGLYCOSYLASE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.250 
  • R-Value Work: 0.199 
  • R-Value Observed: 0.199 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Mutagenesis and crystallographic studies of Zymomonas mobilis tRNA-guanine transglycosylase reveal aspartate 102 as the active site nucleophile.

Romier, C.Reuter, K.Suck, D.Ficner, R.

(1996) Biochemistry 35: 15734-15739

  • DOI: 10.1021/bi962003n
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • Procaryotic tRNA-guanine transglycosylase (TGT) catalyzes the posttranscriptional base exchange of the queuine precursor 7-aminomethyl-7-deazaguanine (preQ1) with the genetically encoded guanine at the wobble position of tRNAs specific for Asn, Asp, ...

    Procaryotic tRNA-guanine transglycosylase (TGT) catalyzes the posttranscriptional base exchange of the queuine precursor 7-aminomethyl-7-deazaguanine (preQ1) with the genetically encoded guanine at the wobble position of tRNAs specific for Asn, Asp, His, and Tyr. The X-ray structures of Zymomonas mobilis TGT and of its complex with preQ1 [Romier, C., Reuter, K., Suck, D., & Ficner, R. (1996) EMBO J. 15, 2850-2857] have revealed a specific preQ1 binding pocket and allowed a proposal for tRNA binding and recognition. We have used band-shift experiments in denaturing conditions to study the enzymatic reaction performed by TGT. The presence of shifted protein bands after incubation with tRNA followed by protein denaturation indicates a reaction mechanism involving a covalent intermediate. Inspection of the X-ray structures and comparison of the different procaryotic TGT sequences highlighted the conserved aspartate 102 as the most likely nucleophile. Mutation of this residue into alanine by site-directed mutagenesis leads to an inactive mutant unable to form a covalent intermediate with tRNA, proving that aspartate 102 is the active site nucleophile in TGT. To investigate the recognition of the wobble guanine in the preQ1 binding pocket, we mutated aspartate 156, the major recognition element for preQ1, into alanine and tyrosine. Both mutants are inactive in producing the final product, but the mutant D156A is able to form the covalent intermediate with tRNA in the first step of the reaction mechanism in comparable amounts to wild-type protein. Therefore, the binding of the wobble guanine in the preQ1 binding pocket is required for the cleavage of the glycosidic bond. The three mutants were crystallized and their X-ray structures determined. The mutants display only subtle changes to the wild-type protein, confirming that the observed biochemical results are due to the chemical substitutions rather than structural rearrangements.


    Related Citations: 
    • Purification, Crystallization, and Preliminary X-Ray Diffraction Studies of tRNA-Guanine Transglycosylase from Zymomonas Mobilis
      Romier, C., Ficner, R., Reuter, K., Suck, D.
      (1996) Proteins 24: 516
    • Crystal Structure of tRNA-Guanine Transglycosylase: RNA Modification by Base Exchange
      Romier, C., Reuter, K., Suck, D., Ficner, R.
      (1996) EMBO J 15: 2850
    • Sequence Analysis and Overexpression of the Zymomonas Mobilis Tgt Gene Encoding tRNA-Guanine Transglycosylase: Purification and Biochemical Characterization of the Enzyme
      Reuter, K., Ficner, R.
      (1995) J Bacteriol 177: 5284

    Organizational Affiliation

    European Molecular Biology Laboratory, Structural Biology Programme, Heidelberg, Germany.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
TRNA-GUANINE TRANSGLYCOSYLASEA386Zymomonas mobilisMutation(s): 1 
Gene Names: tgt
EC: 2.4.2.29
Find proteins for P28720 (Zymomonas mobilis subsp. mobilis (strain ATCC 31821 / ZM4 / CP4))
Explore P28720 
Go to UniProtKB:  P28720
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download CCD File 
A
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.250 
  • R-Value Work: 0.199 
  • R-Value Observed: 0.199 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 90.4α = 90
b = 64.3β = 97.2
c = 72γ = 90
Software Package:
Software NamePurpose
X-PLORmodel building
X-PLORrefinement
XDSdata reduction
X-PLORphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1997-07-07
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance