Biological Assembly 1  

 3D View: Structure | Electron Density

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Global Symmetry: Dihedral - D2  (3D View)
Global Stoichiometry: Homo 4-mer - A4 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 63257.88 
• Atom Count: 3998 
• Residue Count: 538 
• Unique protein chains: 1

3OTE

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

• DOI: 10.2210/pdb3OTE/pdb

• Classification: TRANSFERASE
• Organism(s): Homo sapiens
• Expression System: Escherichia coli BL21(DE3)


• Deposited: 2010-09-11 Released: 2010-11-17 
• Deposition Author(s): Hyde, S.J., Eckenroth, B.E., Doublie, S.

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Experimental Data Snapshot

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

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.USA 107: 20305-20310

• PubMed: 21059936 
• DOI: 10.1073/pnas.1010436107
• Primary Citation of Related Structures:  
  3OTD, 3OTC, 3OTB


• 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. 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.

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Organizational Affiliation: 

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

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
tRNA(His) guanylyltransferase	A, B	269	Homo sapiens	Mutation(s): 0  Gene Names: THG1L (ICF45) EC: 2.7.7.79
Find proteins for Q9NWX6 (Homo sapiens) Go to Gene View: THG1L Go to UniProtKB:  Q9NWX6

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 = 140.571	α = 90.00
b = 140.571	β = 90.00
c = 80.959	γ = 90.00

Software Package:

Software Name	Purpose
SHELX	phasing
SCALEPACK	data scaling
PDB_EXTRACT	data extraction
DENZO	data reduction
SHELXD	phasing
CNS	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2010-09-11 
• Released Date: 2010-11-17 
• Deposition Author(s): Hyde, S.J., Eckenroth, B.E., Doublie, S.

Revision History 

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