3CBG

Functional and Structural Characterization of a Cationdependent O-Methyltransferase from the Cyanobacterium Synechocystis Sp. Strain PCC 6803


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.152 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Functional and Structural Characterization of a Cation-dependent O-Methyltransferase from the Cyanobacterium Synechocystis sp. Strain PCC 6803

Kopycki, J.G.Stubbs, M.T.Brandt, W.Hagemann, M.Porzel, A.Schmidt, J.Schliemann, W.Zenk, M.H.Vogt, T.

(2008) J.Biol.Chem. 283: 20888-20896

  • DOI: 10.1074/jbc.M801943200

  • PubMed Abstract: 
  • The coding sequence of the cyanobacterium Synechocystis sp. strain PCC 6803 slr0095 gene was cloned and functionally expressed in Escherichia coli. The corresponding enzyme was classified as a cation- and S-adenosyl-l-methionine-dependent O-methyltra ...

    The coding sequence of the cyanobacterium Synechocystis sp. strain PCC 6803 slr0095 gene was cloned and functionally expressed in Escherichia coli. The corresponding enzyme was classified as a cation- and S-adenosyl-l-methionine-dependent O-methyltransferase (SynOMT), consistent with considerable amino acid sequence identities to eukaryotic O-methyltransferases (OMTs). The substrate specificity of SynOMT was similar with those of plant and mammalian CCoAOMT-like proteins accepting a variety of hydroxycinnamic acids and flavonoids as substrates. In contrast to the known mammalian and plant enzymes, which exclusively methylate the meta-hydroxyl position of aromatic di- and trihydroxy systems, Syn-OMT also methylates the para-position of hydroxycinnamic acids like 5-hydroxyferulic and 3,4,5-trihydroxycinnamic acid, resulting in the formation of novel compounds. The x-ray structure of SynOMT indicates that the active site allows for two alternative orientations of the hydroxylated substrates in comparison to the active sites of animal and plant enzymes, consistent with the observed preferred para-methylation and position promiscuity. Lys(3) close to the N terminus of the recombinant protein appears to play a key role in the activity of the enzyme. The possible implications of these results with respect to modifications of precursors of polymers like lignin are discussed.


    Organizational Affiliation

    Department of Physical Biotechnology, Institute of Biochemistry and Biotechnology, Martin-Luther-University Halle-Wittenberg, Halle (Saale) 06099, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
O-methyltransferase
A
232Synechocystis sp. (strain PCC 6803 / Kazusa)Mutation(s): 0 
Find proteins for Q55813 (Synechocystis sp. (strain PCC 6803 / Kazusa))
Go to UniProtKB:  Q55813
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
4FE
Query on 4FE

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Download CCD File 
A
(2E)-3-(3-hydroxy-4-methoxyphenyl)prop-2-enoic acid
3-(3-HYDROXY-4-METHOXYPHENYL)-2-PROPENOIC ACID
C10 H10 O4
QURCVMIEKCOAJU-HWKANZROSA-N
 Ligand Interaction
MG
Query on MG

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Download CCD File 
A
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
SAH
Query on SAH

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Download CCD File 
A
S-ADENOSYL-L-HOMOCYSTEINE
C14 H20 N6 O5 S
ZJUKTBDSGOFHSH-WFMPWKQPSA-N
 Ligand Interaction
FER
Query on FER

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Download CCD File 
A
3-(4-HYDROXY-3-METHOXYPHENYL)-2-PROPENOIC ACID
FERULIC ACID
C10 H10 O4
KSEBMYQBYZTDHS-HWKANZROSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.152 
  • Space Group: P 31 2 1
Unit Cell:
Length (Å)Angle (°)
a = 57.622α = 90.00
b = 57.622β = 90.00
c = 119.834γ = 120.00
Software Package:
Software NamePurpose
HKL-2000data reduction
SCALEPACKdata scaling
CrystalCleardata collection
DENZOdata reduction
PHASERphasing
HKL-2000data scaling
CNSrefinement
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2008-06-10
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance
  • Version 1.2: 2017-10-25
    Type: Refinement description