3GDH

Methyltransferase domain of human Trimethylguanosine Synthase 1 (TGS1) bound to m7GTP and adenosyl-homocysteine (active form)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.213 
  • R-Value Work: 0.180 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural basis for m7G-cap hypermethylation of small nuclear, small nucleolar and telomerase RNA by the dimethyltransferase TGS1.

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

(2009) Nucleic Acids Res. 37: 3865-3877

  • DOI: 10.1093/nar/gkp249

  • PubMed Abstract: 
  • The 5'-cap of spliceosomal small nuclear RNAs, some small nucleolar RNAs and of telomerase RNA was found to be hypermethylated in vivo. The Trimethylguanosine Synthase 1 (TGS1) mediates this conversion of the 7-methylguanosine-cap to the 2,2,7-trimet ...

    The 5'-cap of spliceosomal small nuclear RNAs, some small nucleolar RNAs and of telomerase RNA was found to be hypermethylated in vivo. The Trimethylguanosine Synthase 1 (TGS1) mediates this conversion of the 7-methylguanosine-cap to the 2,2,7-trimethylguanosine (m(3)G)-cap during maturation of the RNPs. For mammalian UsnRNAs the generated m(2,2,7)G-cap is one part of a bipartite import signal mediating the transport of the UsnRNP-core complex into the nucleus. In order to understand the structural organization of human TGS1 as well as substrate binding and recognition we solved the crystal structure of the active TGS1 methyltransferase domain containing both, the minimal substrate m(7)GTP and the reaction product S-adenosyl-L-homocysteine (AdoHcy). The methyltransferase of human TGS1 harbors the canonical class 1 methyltransferase fold as well as an unique N-terminal, alpha-helical domain of 40 amino acids, which is essential for m(7)G-cap binding and catalysis. The crystal structure of the substrate bound methyltransferase domain as well as mutagenesis studies provide insight into the catalytic mechanism of TGS1.


    Organizational Affiliation

    Abteilung für Molekulare Strukturbiologie, Institut für Mikrobiologie und Genetik, Georg-August-Universität Göttingen, 37077 Göttingen, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Trimethylguanosine synthase homolog
A, B, C
241Homo sapiensMutation(s): 0 
Gene Names: TGS1 (HCA137, NCOA6IP, PIMT)
EC: 2.1.1.-
Find proteins for Q96RS0 (Homo sapiens)
Go to Gene View: TGS1
Go to UniProtKB:  Q96RS0
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MGP
Query on MGP

Download SDF File 
Download CCD File 
A, B, C
7-METHYL-GUANOSINE-5'-TRIPHOSPHATE
C11 H19 N5 O14 P3
DKVRNHPCAOHRSI-KQYNXXCUSA-O
 Ligand Interaction
PGR
Query on PGR

Download SDF File 
Download CCD File 
A, B, C
R-1,2-PROPANEDIOL
C3 H8 O2
DNIAPMSPPWPWGF-GSVOUGTGSA-N
 Ligand Interaction
SAH
Query on SAH

Download SDF File 
Download CCD File 
A, B, C
S-ADENOSYL-L-HOMOCYSTEINE
C14 H20 N6 O5 S
ZJUKTBDSGOFHSH-WFMPWKQPSA-N
 Ligand Interaction
PGO
Query on PGO

Download SDF File 
Download CCD File 
C
S-1,2-PROPANEDIOL
C3 H8 O2
DNIAPMSPPWPWGF-VKHMYHEASA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.213 
  • R-Value Work: 0.180 
  • Space Group: H 3
Unit Cell:
Length (Å)Angle (°)
a = 156.248α = 90.00
b = 156.248β = 90.00
c = 100.309γ = 120.00
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
SCALEPACKdata scaling
DENZOdata reduction
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-06-23
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance
  • Version 1.2: 2017-11-01
    Type: Advisory, Refinement description