3GBR

Anthranilate phosphoribosyl-transferase (TRPD) double mutant D83G F149S from S. solfataricus


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.25 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.192 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Activation of anthranilate phosphoribosyltransferase from Sulfolobus solfataricus by removal of magnesium inhibition and acceleration of product release

Schlee, S.Deuss, M.Bruning, M.Ivens, A.Schwab, T.Hellmann, N.Mayans, O.Sterner, R.

(2009) Biochemistry 48: 5199-5209

  • DOI: 10.1021/bi802335s

  • PubMed Abstract: 
  • Anthranilate phosphoribosyltransferase from the hyperthermophilic archaeon Sulfolobus solfataricus (ssAnPRT) is encoded by the sstrpD gene and catalyzes the reaction of anthranilate (AA) with a complex of Mg(2+) and 5'-phosphoribosyl-alpha1-pyrophosp ...

    Anthranilate phosphoribosyltransferase from the hyperthermophilic archaeon Sulfolobus solfataricus (ssAnPRT) is encoded by the sstrpD gene and catalyzes the reaction of anthranilate (AA) with a complex of Mg(2+) and 5'-phosphoribosyl-alpha1-pyrophosphate (Mg.PRPP) to N-(5'-phosphoribosyl)-anthranilate (PRA) and pyrophosphate (PP(i)) within tryptophan biosynthesis. The ssAnPRT enzyme is highly thermostable (half-life at 85 degrees C = 35 min) but only marginally active at ambient temperatures (turnover number at 37 degrees C = 0.33 s(-1)). To understand the reason for the poor catalytic proficiency of ssAnPRT, we have isolated from an sstrpD library the activated ssAnPRT-D83G + F149S double mutant by metabolic complementation of an auxotrophic Escherichia coli strain. Whereas the activity of purified wild-type ssAnPRT is strongly reduced in the presence of high concentrations of Mg(2+) ions, this inhibition is no longer observed in the double mutant and the ssAnPRT-D83G single mutant. The comparison of the crystal structures of activated and wild-type ssAnPRT shows that the D83G mutation alters the binding mode of the substrate Mg.PRPP. Analysis of PRPP and Mg(2+)-dependent enzymatic activity indicates that this leads to a decreased affinity for a second Mg(2+) ion and thus reduces the concentration of enzymes with the inhibitory Mg(2).PRPP complex bound to the active site. Moreover, the turnover number of the double mutant ssAnPRT-D83G + F149S is elevated 40-fold compared to the wild-type enzyme, which can be attributed to an accelerated release of the product PRA. This effect appears to be mainly caused by an increased conformational flexibility induced by the F149S mutation, a hypothesis which is supported by the reduced thermal stability of the ssAnPRT-F149S single mutant.


    Organizational Affiliation

    Institute of Biophysics and Physical Biochemistry, University of Regensburg, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Anthranilate phosphoribosyltransferase
A, B
345Saccharolobus solfataricus (strain ATCC 35092 / DSM 1617 / JCM 11322 / P2)Mutation(s): 2 
Gene Names: trpD
EC: 2.4.2.18
Find proteins for P50384 (Saccharolobus solfataricus (strain ATCC 35092 / DSM 1617 / JCM 11322 / P2))
Go to UniProtKB:  P50384
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MN
Query on MN

Download SDF File 
Download CCD File 
A, B
MANGANESE (II) ION
Mn
WAEMQWOKJMHJLA-UHFFFAOYSA-N
 Ligand Interaction
GOL
Query on GOL

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Download CCD File 
B
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
PRP
Query on PRP

Download SDF File 
Download CCD File 
A, B
ALPHA-PHOSPHORIBOSYLPYROPHOSPHORIC ACID
C5 H13 O14 P3
PQGCEDQWHSBAJP-TXICZTDVSA-N
 Ligand Interaction
PEG
Query on PEG

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Download CCD File 
B
DI(HYDROXYETHYL)ETHER
C4 H10 O3
MTHSVFCYNBDYFN-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.25 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.192 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 61.945α = 90.00
b = 65.993β = 98.81
c = 84.262γ = 90.00
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata scaling
XDSdata reduction
XSCALEdata scaling
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-12-15
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Non-polymer description, Version format compliance
  • Version 1.2: 2017-11-01
    Type: Advisory, Refinement description