Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 76.40 kDa 
• Atom Count: 5616 
• Residue Count: 684 
• Unique protein chains: 1

3GBR

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

• DOI: 10.2210/pdb3GBR/pdb

• Classification: TRANSFERASE
• Organism(s): Saccharolobus solfataricus
• Expression System: Escherichia coli
• Mutation(s): Yes 


• Deposited: 2009-02-20 Released: 2009-12-15 
• Deposition Author(s): Bruning, M., Schlee, S., Deuss, M., Ivens, A., Mayans, O., Sterner, R.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.25 Å
• R-Value Free: 0.260 
• R-Value Work: 0.192 
• R-Value Observed: 0.194 

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

• PubMed: 19385665 
• DOI: 10.1021/bi802335s
• Primary Citation of Related Structures:  
  3GBR


• 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-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.

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Organizational Affiliation: 

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

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Anthranilate phosphoribosyltransferase	A, B	345	Saccharolobus solfataricus	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)) Explore P50384  Go to UniProtKB:  P50384

Small Molecules

Ligands 4 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
PRP	A, B	1-O-pyrophosphono-5-O-phosphono-alpha-D-ribofuranose C5 H13 O14 P3 PQGCEDQWHSBAJP-TXICZTDVSA-N
PEG	B	DI(HYDROXYETHYL)ETHER C4 H10 O3 MTHSVFCYNBDYFN-UHFFFAOYSA-N
GOL	B	GLYCEROL C3 H8 O3 PEDCQBHIVMGVHV-UHFFFAOYSA-N
MN	A, B	MANGANESE (II) ION Mn WAEMQWOKJMHJLA-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.25 Å
• R-Value Free: 0.260 
• R-Value Work: 0.192 
• R-Value Observed: 0.194 
• Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 61.945	α = 90
b = 65.993	β = 98.81
c = 84.262	γ = 90

Software Package:

Software Name	Purpose
PHASER	phasing
REFMAC	refinement
XDS	data reduction
XSCALE	data scaling
XDS	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2009-02-20 
• Released Date: 2009-12-15 
Deposition Author(s): Bruning, M., Schlee, S., Deuss, M., Ivens, A., Mayans, O., Sterner, R.

Revision History 

• Version 1.0: 2009-12-15
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Non-polymer description, Version format compliance
• Version 1.2: 2017-11-01
  Changes: Advisory, Refinement description
• Version 1.3: 2020-07-29
  Type: Remediation
  Reason: Carbohydrate remediation
  Changes: Data collection, Derived calculations, Structure summary