4HHE

Quinolinate synthase from Pyrococcus furiosus


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.797 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.208 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Active-site models for complexes of quinolinate synthase with substrates and intermediates.

Soriano, E.V.Zhang, Y.Colabroy, K.L.Sanders, J.M.Settembre, E.C.Dorrestein, P.C.Begley, T.P.Ealick, S.E.

(2013) Acta Crystallogr.,Sect.D 69: 1685-1696

  • DOI: 10.1107/S090744491301247X

  • PubMed Abstract: 
  • Quinolinate synthase (QS) catalyzes the condensation of iminoaspartate and dihydroxyacetone phosphate to form quinolinate, the universal precursor for the de novo biosynthesis of nicotinamide adenine dinucleotide. QS has been difficult to characteriz ...

    Quinolinate synthase (QS) catalyzes the condensation of iminoaspartate and dihydroxyacetone phosphate to form quinolinate, the universal precursor for the de novo biosynthesis of nicotinamide adenine dinucleotide. QS has been difficult to characterize owing either to instability or lack of activity when it is overexpressed and purified. Here, the structure of QS from Pyrococcus furiosus has been determined at 2.8 Å resolution. The structure is a homodimer consisting of three domains per protomer. Each domain shows the same topology with a four-stranded parallel β-sheet flanked by four α-helices, suggesting that the domains are the result of gene triplication. Biochemical studies of QS indicate that the enzyme requires a [4Fe-4S] cluster, which is lacking in this crystal structure, for full activity. The organization of domains in the protomer is distinctly different from that of a monomeric structure of QS from P. horikoshii [Sakuraba et al. (2005), J. Biol. Chem. 280, 26645-26648]. The domain arrangement in P. furiosus QS may be related to protection of cysteine side chains, which are required to chelate the [4Fe-4S] cluster, prior to cluster assembly.


    Organizational Affiliation

    Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY 14853-1301, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Quinolinate synthase A
A
323Pyrococcus furiosus (strain ATCC 43587 / DSM 3638 / JCM 8422 / Vc1)Mutation(s): 0 
Gene Names: nadA
EC: 2.5.1.72
Find proteins for Q8TZL3 (Pyrococcus furiosus (strain ATCC 43587 / DSM 3638 / JCM 8422 / Vc1))
Go to UniProtKB:  Q8TZL3
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CL
Query on CL

Download SDF File 
Download CCD File 
A
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.797 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.208 
  • Space Group: I 2 2 2
Unit Cell:
Length (Å)Angle (°)
a = 76.915α = 90.00
b = 80.717β = 90.00
c = 141.042γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data reduction
SCALEPACKdata scaling
PHENIXrefinement
SnBphasing
HKL-2000data scaling
ADSCdata collection
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-08-28
    Type: Initial release
  • Version 1.1: 2013-09-18
    Type: Database references