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: 2.00 Å
  • R-Value Free: 0.213 
  • R-Value Work: 0.180 
  • R-Value Observed: 0.182 

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Ligand Structure Quality Assessment 


This is version 1.3 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: https://doi.org/10.1093/nar/gkp249
  • Primary Citation of Related Structures:  
    3GDH

  • 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-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:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Trimethylguanosine synthase homolog
A, B, C
241Homo sapiensMutation(s): 0 
Gene Names: TGS1HCA137NCOA6IPPIMT
EC: 2.1.1
UniProt & NIH Common Fund Data Resources
Find proteins for Q96RS0 (Homo sapiens)
Explore Q96RS0 
Go to UniProtKB:  Q96RS0
PHAROS:  Q96RS0
GTEx:  ENSG00000137574 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ96RS0
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
MGP
Query on MGP

Download Ideal Coordinates CCD File 
D [auth A],
H [auth B],
K [auth C]
7-METHYL-GUANOSINE-5'-TRIPHOSPHATE
C11 H19 N5 O14 P3
DKVRNHPCAOHRSI-KQYNXXCUSA-O
SAH
Query on SAH

Download Ideal Coordinates CCD File 
E [auth A],
I [auth B],
L [auth C]
S-ADENOSYL-L-HOMOCYSTEINE
C14 H20 N6 O5 S
ZJUKTBDSGOFHSH-WFMPWKQPSA-N
PGR
Query on PGR

Download Ideal Coordinates CCD File 
F [auth A],
G [auth A],
J [auth B],
M [auth C]
R-1,2-PROPANEDIOL
C3 H8 O2
DNIAPMSPPWPWGF-GSVOUGTGSA-N
PGO
Query on PGO

Download Ideal Coordinates CCD File 
N [auth C]S-1,2-PROPANEDIOL
C3 H8 O2
DNIAPMSPPWPWGF-VKHMYHEASA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.213 
  • R-Value Work: 0.180 
  • R-Value Observed: 0.182 
  • Space Group: H 3
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 156.248α = 90
b = 156.248β = 90
c = 100.309γ = 120
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
PHENIXrefinement
PDB_EXTRACTdata extraction

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-06-23
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2017-11-01
    Changes: Advisory, Refinement description
  • Version 1.3: 2024-02-21
    Changes: Advisory, Data collection, Database references, Derived calculations