1LBM

CRYSTAL STRUCTURE OF PHOSPHORIBOSYL ANTHRANILATE ISOMERASE (PRAI) IN COMPLEX WITH REDUCED 1-(O-CARBOXYPHENYLAMINO)-1-DEOXYRIBULOSE 5-PHOSPHATE (RCDRP)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.228 
  • R-Value Work: 0.170 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Two (betaalpha)(8)-barrel enzymes of histidine and tryptophan biosynthesis have similar reaction mechanisms and common strategies for protecting their labile substrates

Henn-Sax, M.Thoma, R.Schmidt, S.Hennig, M.Kirschner, K.Sterner, R.

(2002) Biochemistry 41: 12032-12042


  • PubMed Abstract: 
  • The enzymes N'-[(5'-phosphoribosyl)formimino]-5-aminoimidazole-4-carboxamide ribonucleotide isomerase (HisA) and phosphoribosylanthranilate isomerase (TrpF) are sugar isomerases that are involved in histidine and tryptophan biosynthesis, respectively ...

    The enzymes N'-[(5'-phosphoribosyl)formimino]-5-aminoimidazole-4-carboxamide ribonucleotide isomerase (HisA) and phosphoribosylanthranilate isomerase (TrpF) are sugar isomerases that are involved in histidine and tryptophan biosynthesis, respectively. Both enzymes have the (betaalpha)(8)-barrel fold and catalyze Amadori rearrangements of a thermolabile aminoaldose into the corresponding aminoketose. To identify those amino acids that are essential for catalysis, conserved residues at the active sites of both HisA and TrpF from the hyperthermophile Thermotoga maritima were replaced by site-directed mutagenesis, and the purified variants were investigated by steady-state enzyme kinetics. Aspartate 8, aspartate 127, and threonine 164 appeared to be important for the HisA reaction, whereas cysteine 7 and aspartate 126 appeared to be important for the TrpF reaction. On the basis of these results and the X-ray structure of a complex between TrpF and a bound product analogue, a reaction mechanism involving general acid-base catalysis and a Schiff base intermediate is proposed for both enzymes. A comparison of the HisA and TrpF enzymes from T. maritima and Escherichia coli showed that, at the physiological temperatures of 80 and 37 degrees C, respectively, the enzymes from the hyperthermophile have significantly higher catalytic efficiencies than the corresponding enzymes from mesophiles. These results suggest that HisA and TrpF have similar chemical reaction mechanisms and use the same strategy to prevent the loss of their thermolabile substrates.


    Organizational Affiliation

    Institut für Biochemie, Universität zu Köln, Otto-Fischer-Strasse 12-14, D-50674 Köln, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PHOSPHORIBOSYL ANTHRANILATE ISOMERASE
A
205Thermotoga maritima (strain ATCC 43589 / MSB8 / DSM 3109 / JCM 10099)Gene Names: trpF
EC: 5.3.1.24
Find proteins for Q56320 (Thermotoga maritima (strain ATCC 43589 / MSB8 / DSM 3109 / JCM 10099))
Go to UniProtKB:  Q56320
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
137
Query on 137

Download SDF File 
Download CCD File 
A
1-(O-CARBOXY-PHENYLAMINO)-1-DEOXY-D-RIBULOSE-5-PHOSPHATE
C12 H18 N O9 P
AULMJMUNCOBRHC-MXWKQRLJSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.228 
  • R-Value Work: 0.170 
  • Space Group: P 61 2 2
Unit Cell:
Length (Å)Angle (°)
a = 68.835α = 90.00
b = 68.834β = 90.00
c = 187.163γ = 120.00
Software Package:
Software NamePurpose
XSCALEdata scaling
SCALEdata scaling
X-PLORrefinement
XDSdata reduction
XDSdata scaling
X-PLORmodel building
X-PLORphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2002-12-18
    Type: Initial release
  • Version 1.1: 2008-04-28
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Derived calculations, Version format compliance
  • Version 1.3: 2017-10-11
    Type: Advisory, Refinement description