2YX0

Crystal structure of P. horikoshii TYW1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.21 Å
  • R-Value Free: 0.242 
  • R-Value Work: 0.194 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structure of an archaeal TYW1, the enzyme catalyzing the second step of wye-base biosynthesis

Goto-Ito, S.Ishii, R.Ito, T.Shibata, R.Fusatomi, E.Sekine, S.Bessho, Y.Yokoyama, S.

(2007) Acta Crystallogr.,Sect.D 63: 1059-1068

  • DOI: 10.1107/S0907444907040668

  • PubMed Abstract: 
  • Wye bases are tricyclic bases that are found in archaeal and eukaryotic tRNAs. The most modified wye base, wybutosine, which appears at position 37 (the 3'-adjacent position to the anticodon), is known to be important for translational reading-frame ...

    Wye bases are tricyclic bases that are found in archaeal and eukaryotic tRNAs. The most modified wye base, wybutosine, which appears at position 37 (the 3'-adjacent position to the anticodon), is known to be important for translational reading-frame maintenance. Saccharomyces cerevisiae TYW1 catalyzes the tri-ring-formation step in wye-base biosynthesis, with the substrate tRNA bearing N(1)-methylated G37. Here, the crystal structure of the archaeal TYW1 homologue from Pyrococcus horikoshii is reported at 2.2 A resolution. The amino-acid sequence of P. horikoshii TYW1 suggested that it is a radical-AdoMet enzyme and the tertiary structure of P. horikoshii TYW1 indeed shares the modified TIM-barrel structure found in other radical-AdoMet enzymes. Radical-AdoMet enzymes generally contain one or two iron-sulfur (FeS) clusters. The tertiary structure of P. horikoshii TYW1 revealed two FeS cluster sites, each containing three cysteine residues. One FeS cluster site was expected from the amino-acid sequence and the other involves cysteine residues that are dispersed throughout the sequence. The existence of two FeS clusters was confirmed from the anomalous Fourier electron-density map. By superposing the P. horikoshii TYW1 tertiary structure on those of other radical-AdoMet enzymes, the AdoMet molecule, which is necessary for the reactions of radical-AdoMet enzymes, was modelled in P. horikoshii TYW1. Surface plots of conservation rates and electrostatic potentials revealed the highly conserved and positively charged active-site hollow. On the basis of the surface properties, a docking model of P. horikoshii TYW1, the tRNA, the FeS clusters and the AdoMet molecule was constructed, with the nucleoside at position 37 of tRNA flipped out from the canonical tRNA structure.


    Organizational Affiliation

    Department of Biophysics and Biochemistry, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
radical sam enzyme
A
342Pyrococcus horikoshii (strain ATCC 700860 / DSM 12428 / JCM 9974 / NBRC 100139 / OT-3)Gene Names: taw1
EC: 4.1.3.44
Find proteins for O59412 (Pyrococcus horikoshii (strain ATCC 700860 / DSM 12428 / JCM 9974 / NBRC 100139 / OT-3))
Go to UniProtKB:  O59412
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.21 Å
  • R-Value Free: 0.242 
  • R-Value Work: 0.194 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 41.920α = 90.00
b = 60.850β = 90.00
c = 153.810γ = 90.00
Software Package:
Software NamePurpose
CNSrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2007-10-30
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance