Crystal structure of ph0300

Experimental Data Snapshot

  • Resolution: 2.10 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.206 
  • R-Value Observed: 0.208 

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Crystallographic and mutational studies on the tRNA thiouridine synthetase TtuA.

Nakagawa, H.Kuratani, M.Goto-Ito, S.Ito, T.Katsura, K.Terada, T.Shirouzu, M.Sekine, S.I.Shigi, N.Yokoyama, S.

(2013) Proteins 

  • DOI: https://doi.org/10.1002/prot.24273
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    In thermophilic bacteria, specific 2-thiolation occurs on the conserved ribothymidine at position 54 (T54) in tRNAs, which is necessary for survival at high temperatures. T54 2-thiolation is achieved by the tRNA thiouridine synthetase TtuA and sulfur-carrier proteins. TtuA has five conserved CXXC/H motifs and the signature PP motif, and belongs to the TtcA family of tRNA 2-thiolation enzymes, for which there is currently no structural information. In this study, we determined the crystal structure of a TtuA homolog from the hyperthermophilic archeon Pyrococcus horikoshii at 2.1 Å resolution. The P. horikoshii TtuA forms a homodimer, and each subunit contains a catalytic domain and unique N- and C-terminal zinc fingers. The catalytic domain has much higher structural similarity to that of another tRNA modification enzyme, TilS (tRNA(Ile)₂ lysidine synthetase), than to the other type of tRNA 2-thiolation enzyme, MnmA. Three conserved cysteine residues are clustered in the putative catalytic site, which is not present in TilS. An in vivo mutational analysis in the bacterium Thermus thermophilus demonstrated that the three conserved cysteine residues and the putative ATP-binding residues in the catalytic domain are important for the TtuA activity. A positively charged surface that includes the catalytic site and the two zinc fingers is likely to provide the tRNA-binding site.

  • 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.

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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Putative uncharacterized protein PH0300310Pyrococcus horikoshii OT3Mutation(s): 0 
Gene Names: PH0300
Find proteins for O58038 (Pyrococcus horikoshii (strain ATCC 700860 / DSM 12428 / JCM 9974 / NBRC 100139 / OT-3))
Explore O58038 
Go to UniProtKB:  O58038
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO58038
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.10 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.206 
  • R-Value Observed: 0.208 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 70.071α = 90
b = 70.071β = 90
c = 128.636γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-03-13
    Type: Initial release