4YMG

Crystal structure of SAM-bound Podospora anserina methyltransferase PaMTH1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.202 
  • R-Value Work: 0.159 
  • R-Value Observed: 0.161 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 1.4 of the entry. See complete history


Literature

Structure and Biophysical Characterization of the S-Adenosylmethionine-dependent O-Methyltransferase PaMTH1, a Putative Enzyme Accumulating during Senescence of Podospora anserina.

Chatterjee, D.Kudlinzki, D.Linhard, V.Saxena, K.Schieborr, U.Gande, S.L.Wurm, J.P.Wohnert, J.Abele, R.Rogov, V.V.Dotsch, V.Osiewacz, H.D.Sreeramulu, S.Schwalbe, H.

(2015) J Biol Chem 290: 16415-16430

  • DOI: https://doi.org/10.1074/jbc.M115.660829
  • Primary Citation of Related Structures:  
    4QVK, 4YMG, 4YMH

  • PubMed Abstract: 

    Low levels of reactive oxygen species (ROS) act as important signaling molecules, but in excess they can damage biomolecules. ROS regulation is therefore of key importance. Several polyphenols in general and flavonoids in particular have the potential to generate hydroxyl radicals, the most hazardous among all ROS. However, the generation of a hydroxyl radical and subsequent ROS formation can be prevented by methylation of the hydroxyl group of the flavonoids. O-Methylation is performed by O-methyltransferases, members of the S-adenosyl-l-methionine (SAM)-dependent O-methyltransferase superfamily involved in the secondary metabolism of many species across all kingdoms. In the filamentous fungus Podospora anserina, a well established aging model, the O-methyltransferase (PaMTH1) was reported to accumulate in total and mitochondrial protein extracts during aging. In vitro functional studies revealed flavonoids and in particular myricetin as its potential substrate. The molecular architecture of PaMTH1 and the mechanism of the methyl transfer reaction remain unknown. Here, we report the crystal structures of PaMTH1 apoenzyme, PaMTH1-SAM (co-factor), and PaMTH1-S-adenosyl homocysteine (by-product) co-complexes refined to 2.0, 1.9, and 1.9 Å, respectively. PaMTH1 forms a tight dimer through swapping of the N termini. Each monomer adopts the Rossmann fold typical for many SAM-binding methyltransferases. Structural comparisons between different O-methyltransferases reveal a strikingly similar co-factor binding pocket but differences in the substrate binding pocket, indicating specific molecular determinants required for substrate selection. Furthermore, using NMR, mass spectrometry, and site-directed active site mutagenesis, we show that PaMTH1 catalyzes the transfer of the methyl group from SAM to one hydroxyl group of the myricetin in a cation-dependent manner.


  • Organizational Affiliation

    From the Institute for Organic Chemistry and Chemical Biology, Center for Biomolecular Magnetic Resonance (BMRZ), Johann Wolfgang Goethe University, Max-von-Laue-Strasse 7, D-60438 Frankfurt am Main, Germany.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Putative SAM-dependent O-methyltranferase
A, B
240Podospora anserinaMutation(s): 0 
Gene Names: mth1
UniProt
Find proteins for Q9HGR1 (Podospora anserina)
Explore Q9HGR1 
Go to UniProtKB:  Q9HGR1
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9HGR1
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
SAM
Query on SAM

Download Ideal Coordinates CCD File 
C [auth A],
H [auth B]
S-ADENOSYLMETHIONINE
C15 H22 N6 O5 S
MEFKEPWMEQBLKI-FCKMPRQPSA-N
PG4
Query on PG4

Download Ideal Coordinates CCD File 
F [auth A]TETRAETHYLENE GLYCOL
C8 H18 O5
UWHCKJMYHZGTIT-UHFFFAOYSA-N
PO4
Query on PO4

Download Ideal Coordinates CCD File 
D [auth A],
E [auth A],
I [auth B]
PHOSPHATE ION
O4 P
NBIIXXVUZAFLBC-UHFFFAOYSA-K
MG
Query on MG

Download Ideal Coordinates CCD File 
G [auth A]MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.202 
  • R-Value Work: 0.159 
  • R-Value Observed: 0.161 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 75.04α = 90
b = 78.791β = 90
c = 82.718γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
Cootmodel building
PHASERphasing
Aimlessdata scaling

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-05-27
    Type: Initial release
  • Version 1.1: 2015-06-03
    Changes: Database references
  • Version 1.2: 2015-07-08
    Changes: Database references
  • Version 1.3: 2019-06-12
    Changes: Data collection, Structure summary
  • Version 1.4: 2024-01-10
    Changes: Data collection, Database references, Refinement description