1QV9

Coenzyme F420-dependent methylenetetrahydromethanopterin dehydrogenase (Mtd) from Methanopyrus kandleri: A methanogenic enzyme with an unusual quarternary structure


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.54 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.201 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Coenzyme F420-dependent methylenetetrahydromethanopterin dehydrogenase (Mtd) from Methanopyrus kandleri: a methanogenic enzyme with an unusual quarternary structure

Hagemeier, C.H.Shima, S.Thauer, R.K.Bourenkov, G.Bartunik, H.D.Ermler, U.

(2003) J.Mol.Biol. 332: 1047-1057

  • Also Cited By: 1U6K, 1U6J, 1U6I

  • PubMed Abstract: 
  • The fourth reaction step of CO(2)-reduction to methane in methanogenic archaea is catalyzed by coenzyme F(420)-dependent methylenetetrahydromethanopterin dehydrogenase (Mtd). We have structurally characterized this enzyme in the selenomethionine-labe ...

    The fourth reaction step of CO(2)-reduction to methane in methanogenic archaea is catalyzed by coenzyme F(420)-dependent methylenetetrahydromethanopterin dehydrogenase (Mtd). We have structurally characterized this enzyme in the selenomethionine-labelled form from the hyperthermophilic methanogenic archaeon Methanopyrus kandleri at 1.54A resolution using the single wavelength anomalous dispersion method for phase determination. Mtd was found to be a homohexameric protein complex that is organized as a trimer of dimers. The fold of the individual subunits is composed of two domains: a larger alpha,beta domain and a smaller helix bundle domain with a short C-terminal beta-sheet segment. In the homohexamer the alpha,beta domains are positioned at the outside of the enzyme, whereas, the helix bundle domains assemble towards the inside to form an unusual quarternary structure with a 12-helix bundle around a 3-fold axis. No structural similarities are detectable to other enzymes with F(420) and/or substituted tetrahydropterins as substrates. The substrate binding sites of F(420) and methylenetetrahydromethanopterin are most likely embedded into a crevice between the domains of one subunit, their isoalloxazine and tetrahydropterin rings being placed inside a pocket formed by this crevice and a loop segment of the adjacent monomer of the dimer. Mtd revealed the highest stability at low salt concentrations of all structurally characterized enzymes from M.kandleri. This finding might be due to the compact quaternary structure that buries 36% of the monomer surface and to the large number of ion pairs.


    Organizational Affiliation

    Max-Planck-Institut für terrestrische Mikrobiologie, Karl-von-Frisch-Strasse, D-35043, Marburg, Germany




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
F420-dependent methylenetetrahydromethanopterin dehydrogenase
A, B, C
283Methanopyrus kandleri (strain AV19 / DSM 6324 / JCM 9639 / NBRC 100938)Mutation(s): 0 
Gene Names: mtd
EC: 1.5.98.1
Find proteins for P94951 (Methanopyrus kandleri (strain AV19 / DSM 6324 / JCM 9639 / NBRC 100938))
Go to UniProtKB:  P94951
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MG
Query on MG

Download SDF File 
Download CCD File 
A, B
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A, B, C
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.54 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.201 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 120.100α = 90.00
b = 151.200β = 90.00
c = 110.000γ = 90.00
Software Package:
Software NamePurpose
SHARPphasing
DENZOdata reduction
SHELXDphasing
CNSrefinement
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-11-11
    Type: Initial release
  • Version 1.1: 2008-04-29
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Derived calculations, Version format compliance