3EGI

Methyltransferase domain of human trimethylguanosine synthase TGS1 bound to m7GpppA (inactive form)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.21 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.210 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structure analysis of the conserved methyltransferase domain of human trimethylguanosine synthase TGS1.

Monecke, T.Dickmanns, A.Strasser, A.Ficner, R.

(2009) Acta Crystallogr D Biol Crystallogr 65: 332-338

  • DOI: 10.1107/S0907444909003102
  • Primary Citation of Related Structures:  
    3EGI

  • PubMed Abstract: 
  • Methyltransferases play an important role in the post-transcriptional maturation of most ribonucleic acids. The modification of spliceosomal UsnRNAs includes N2-dimethylation of the m(7)G cap catalyzed by trimethylguanosine synthase 1 (TGS1). This 5' ...

    Methyltransferases play an important role in the post-transcriptional maturation of most ribonucleic acids. The modification of spliceosomal UsnRNAs includes N2-dimethylation of the m(7)G cap catalyzed by trimethylguanosine synthase 1 (TGS1). This 5'-cap hypermethylation occurs during the biogenesis of UsnRNPs as it initiates the m(3)G cap-dependent nuclear import of UsnRNPs. The conserved methyltransferase domain of human TGS1 has been purified, crystallized and the crystal structure of this domain with bound substrate m(7)GpppA was solved by means of multiple-wavelength anomalous dispersion. Crystal structure analysis revealed that m(7)GpppA binds via its adenosine moiety to the structurally conserved adenosylmethionine-binding pocket, while the m(7) guanosine remains unbound. This unexpected binding only occurs in the absence of AdoMet and suggests an incomplete binding pocket for the m(7)G cap which is caused by the N-terminal truncation of the protein. These structural data are consistent with the finding that the crystallized fragment of human TGS1 is catalytically inactive, while a fragment that is 17 amino acids longer exhibits activity.


    Organizational Affiliation

    Department of Molecular Structural Biology, Institute of Microbiology and Genetics, Georg-August-University Göttingen, Göttingen, Germany.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Trimethylguanosine synthase homologABCD206Homo sapiensMutation(s): 0 
Gene Names: TGS1HCA137NCOA6IPPIMT
EC: 2.1.1
Find proteins for Q96RS0 (Homo sapiens)
Explore Q96RS0 
Go to UniProtKB:  Q96RS0
NIH Common Fund Data Resources
PHAROS  Q96RS0
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ADP
Query on ADP

Download CCD File 
A, B, C, D
ADENOSINE-5'-DIPHOSPHATE
C10 H15 N5 O10 P2
XTWYTFMLZFPYCI-KQYNXXCUSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A,B,C,DL-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.21 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.210 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 213.893α = 90
b = 213.893β = 90
c = 62.415γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
SHARPphasing
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-03-31
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2012-04-18
    Changes: Database references