3OTE

Crystal structure of human tRNAHis guanylyltransferase (Thg1)- Native I

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.56 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.231 

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This is version 1.2 of the entry. See complete history. 


Literature

tRNAHis guanylyltransferase (THG1), a unique 3'-5' nucleotidyl transferase, shares unexpected structural homology with canonical 5'-3' DNA polymerases.

Hyde, S.J., Eckenroth, B.E., Smith, B.A., Eberley, W.A., Heintz, N.H., Jackman, J.E., Doublie, S.

(2010) Proc Natl Acad Sci U S A 107: 20305-20310

  • DOI: 10.1073/pnas.1010436107
  • Primary Citation of Related Structures:  
    3OTB, 3OTC, 3OTD, 3OTE

  • PubMed Abstract: 

    • All known DNA and RNA polymerases catalyze the formation of phosphodiester bonds in a 5' to 3' direction, suggesting this property is a fundamental feature of maintaining and dispersing genetic information. The tRNA(His) guanylyltransferase (Thg1) is a member of a unique enzyme family whose members catalyze an unprecedented reaction in biology: 3'-5' addition of nucleotides to nucleic acid substrates ...

    All known DNA and RNA polymerases catalyze the formation of phosphodiester bonds in a 5' to 3' direction, suggesting this property is a fundamental feature of maintaining and dispersing genetic information. The tRNA(His) guanylyltransferase (Thg1) is a member of a unique enzyme family whose members catalyze an unprecedented reaction in biology: 3'-5' addition of nucleotides to nucleic acid substrates. The 2.3-Å crystal structure of human THG1 (hTHG1) reported here shows that, despite the lack of sequence similarity, hTHG1 shares unexpected structural homology with canonical 5'-3' DNA polymerases and adenylyl/guanylyl cyclases, two enzyme families known to use a two-metal-ion mechanism for catalysis. The ability of the same structural architecture to catalyze both 5'-3' and 3'-5' reactions raises important questions concerning selection of the 5'-3' mechanism during the evolution of nucleotide polymerases.

    Organizational Affiliation: 

    Department of Microbiology and Molecular Genetics, University of Vermont, Burlington, Vermont 05405, USA.



Macromolecules
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(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
tRNA(His) guanylyltransferaseA, B269Homo sapiensMutation(s): 0 
Gene Names: ICF45, THG1L
EC: 2.7.7 (PDB Primary Data), 2.7.7.79 (UniProt)
UniProt & NIH Common Fund Data Resources
Find proteins for Q9NWX6 (Homo sapiens)
Explore Q9NWX6 
Go to UniProtKB:  Q9NWX6
PHAROS:  Q9NWX6
GTEx:  ENSG00000113272
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.56 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.231 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 140.571α = 90
b = 140.571β = 90
c = 80.959γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
SHELXphasing
CNSrefinement
PDB_EXTRACTdata extraction
SHELXDphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-11-17
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2014-04-09
    Changes: Source and taxonomy