1GTQ

6-PYRUVOYL TETRAHYDROPTERIN SYNTHASE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Work: 0.204 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Three-dimensional structure of 6-pyruvoyl tetrahydropterin synthase, an enzyme involved in tetrahydrobiopterin biosynthesis.

Nar, H.Huber, R.Heizmann, C.W.Thony, B.Burgisser, D.

(1994) EMBO J. 13: 1255-1262


  • PubMed Abstract: 
  • The crystal structure of rat liver 6-pyruvoyl tetrahydropterin synthase has been solved by multiple isomorphous replacement and refined to a crystallographic R-factor of 20.4% at 2.3 A resolution. 6-Pyruvoyl tetrahydrobiopterin synthase catalyses the ...

    The crystal structure of rat liver 6-pyruvoyl tetrahydropterin synthase has been solved by multiple isomorphous replacement and refined to a crystallographic R-factor of 20.4% at 2.3 A resolution. 6-Pyruvoyl tetrahydrobiopterin synthase catalyses the conversion of dihydroneopterin triphosphate to 6-pyruvoyl tetrahydropterin, the second of three enzymatic steps in the synthesis of tetrahydrobiopterin from GTP. The functional enzyme is a hexamer of identical subunits. The 6-pyruvoyl tetrahydropterin synthase monomer folds into a sequential, four-stranded, antiparallel beta-sheet with a 25 residue, helix-containing insertion between strands 1 and 2 at the bottom of the molecule, and a segment between strands 2 and 3 forming a pair of antiparallel helices, layered on one side of the beta-sheet. Three 6-pyruvoyl tetrahydropterin synthase monomers form an unusual 12-stranded antiparallel beta-barrel by tight association between the N- and C-terminal beta-strands of two adjacent subunits. The barrel encloses a highly basic pore of 6-12 A diameter. Two trimers associate in a head-to-head fashion to form the active enzyme complex. The substrate-binding site is located close to the trimer-trimer interface and comprises residues from three monomers: A, A' and B. A metal-binding site in the substrate-binding pocket is formed by the three histidine residues 23, 48 and 50 from one 6-pyruvoyl tetrahydropterin synthase subunit. Close to the metal, but apparently not liganding it, are residues Cys42, Glu133 (both from A) and His89 (from B), which might serve as proton donors and acceptors during catalysis.


    Organizational Affiliation

    Max Planck Institut für Biochemie, Abteilung Strukturforschung, Martinsried Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
6-PYRUVOYL TETRAHYDROPTERIN SYNTHASE
A, B
140Rattus norvegicusGene Names: Pts
EC: 4.2.3.12
Find proteins for P27213 (Rattus norvegicus)
Go to UniProtKB:  P27213
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download SDF File 
Download CCD File 
A, B
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Work: 0.204 
  • Space Group: P 3 2 1
Unit Cell:
Length (Å)Angle (°)
a = 122.300α = 90.00
b = 122.300β = 90.00
c = 61.600γ = 120.00
Software Package:
Software NamePurpose
MOSFLMdata reduction
X-PLORmodel building
X-PLORphasing
X-PLORrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1996-04-03
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance