1QWG

Crystal structure of Methanococcus jannaschii phosphosulfolactate synthase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.6 Å
  • R-Value Free: 0.193 
  • R-Value Work: 0.173 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The structural determination of phosphosulfolactate synthase from Methanococcus jannaschii at 1.7-A resolution: an enolase that is not an enolase

Wise, E.L.Graham, D.E.White, R.H.Rayment, I.

(2003) J.Biol.Chem. 278: 45858-45863

  • DOI: 10.1074/jbc.M307486200

  • PubMed Abstract: 
  • Members of the enolase mechanistically diverse superfamily catalyze a wide variety of chemical reactions that are related by a common mechanistic feature, the abstraction of a proton adjacent to a carboxylate group. Recent investigations into the fun ...

    Members of the enolase mechanistically diverse superfamily catalyze a wide variety of chemical reactions that are related by a common mechanistic feature, the abstraction of a proton adjacent to a carboxylate group. Recent investigations into the function and mechanism of the phosphosulfolactate synthase encoded by the ComA gene in Methanococcus jannaschii have suggested that ComA, which catalyzes the stereospecific Michael addition of sulfite to phosphoenolpyruvate to form phosphosulfolactate, may be a member of the enolase superfamily. The ComA-catalyzed reaction, the first step in the coenzyme M biosynthetic pathway, likely proceeds via a Mg2+ ion-stabilized enolate intermediate in a manner similar to that observed for members of the enolase superfamily. ComA, however, has no significant sequence similarity to any known enolase. Here we report the x-ray crystal structure of ComA to 1.7-A resolution. The overall fold for ComA is an (alpha/beta)8 barrel that assembles with two other ComA molecules to form a trimer in which three active sites are created at the subunit interfaces. From the positions of two ordered sulfate ions in the active site, a model for the binding of phosphoenolpyruvate and sulfite is proposed. Despite its mechanistic similarity to the enolase superfamily, the overall structure and active site architecture of ComA are unlike any member of the enolase superfamily, which suggests that ComA is not a member of the enolase superfamily but instead acquired an enolase-type mechanism through convergent evolution.


    Organizational Affiliation

    Department of Biochemistry, University of Wisconsin, Madison, Wisconsin 53706, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
(2R)-phospho-3-sulfolactate synthase
A
251Methanocaldococcus jannaschii (strain ATCC 43067 / DSM 2661 / JAL-1 / JCM 10045 / NBRC 100440)Gene Names: comA
EC: 4.4.1.19
Find proteins for Q57703 (Methanocaldococcus jannaschii (strain ATCC 43067 / DSM 2661 / JAL-1 / JCM 10045 / NBRC 100440))
Go to UniProtKB:  Q57703
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.6 Å
  • R-Value Free: 0.193 
  • R-Value Work: 0.173 
  • Space Group: P 21 3
Unit Cell:
Length (Å)Angle (°)
a = 93.789α = 90.00
b = 93.789β = 90.00
c = 93.789γ = 90.00
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
CNSrefinement
CNSphasing
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-12-09
    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