2ZZK

Crystal structure of tRNA wybutosine synthesizing enzyme TYW4


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.706 Å
  • R-Value Free: 0.274 
  • R-Value Work: 0.210 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structural basis of tRNA modification with CO2 fixation and methylation by wybutosine synthesizing enzyme TYW4.

Suzuki, Y.Noma, A.Suzuki, T.Ishitani, R.Nureki, O.

(2009) Nucleic Acids Res. 37: 2910-2925

  • DOI: 10.1093/nar/gkp158
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Wybutosine (yW), one of the most complicated modified nucleosides, is found in the anticodon loop of eukaryotic phenylalanine tRNA. This hypermodified nucleoside ensures correct codon recognition by stabilizing codon-anticodon pairings during the dec ...

    Wybutosine (yW), one of the most complicated modified nucleosides, is found in the anticodon loop of eukaryotic phenylalanine tRNA. This hypermodified nucleoside ensures correct codon recognition by stabilizing codon-anticodon pairings during the decoding process in the ribosome. TYW4 is an S-adenosylmethionine (SAM)-dependent enzyme that catalyzes the final step of yW biosynthesis, methylation and methoxycarbonylation. However, the structural basis for the catalytic mechanism by TYW4, and especially that for the methoxycarbonylation, have remained elusive. Here we report the apo and cofactor-bound crystal structures of yeast TYW4. The structures revealed that the C-terminal domain folds into a beta-propeller structure, forming part of the binding pocket for the target nucleoside. A comparison of the apo, SAM-bound, and S-adenosylhomocysteine-bound structures of TYW4 revealed a drastic structural change upon cofactor binding, which may sequester solvent from the catalytic site during the reaction and facilitate product release after the reaction. In conjunction with the functional analysis, our results suggest that TYW4 catalyzes both methylation and methoxycarbonylation at a single catalytic site, and in the latter reaction, the methoxycarbonyl group is formed through the fixation of carbon dioxide.


    Organizational Affiliation

    Department of Biological Information, Graduate School of Bioscience and Biotechnology, Tokyo Institute of Technology, Yokohama-shi, Kanagawa, Japan.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Leucine carboxyl methyltransferase 2
A, B
695Saccharomyces cerevisiae (strain ATCC 204508 / S288c)Mutation(s): 0 
Gene Names: PPM2 (TYW4)
EC: 2.1.1.290, 2.3.1.231
Find proteins for Q08282 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Go to UniProtKB:  Q08282
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CIT
Query on CIT

Download SDF File 
Download CCD File 
A, B
CITRIC ACID
C6 H8 O7
KRKNYBCHXYNGOX-UHFFFAOYSA-N
 Ligand Interaction
PG4
Query on PG4

Download SDF File 
Download CCD File 
A
TETRAETHYLENE GLYCOL
C8 H18 O5
UWHCKJMYHZGTIT-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.706 Å
  • R-Value Free: 0.274 
  • R-Value Work: 0.210 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 78.834α = 90.00
b = 90.139β = 90.00
c = 251.376γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data reduction
HKL-2000data collection
PHENIXrefinement
HKL-2000data scaling
SHARPphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-06-02
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance