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Extremophiles

, Volume 23, Issue 1, pp 69–77 | Cite as

Extremely stable indole-3-glycerol-phosphate synthase from hyperthermophilic archaeon Pyrococcus furiosus

  • Muhammad Arif
  • Naeem RashidEmail author
  • Sumera Perveen
  • Qamar Bashir
  • Muhammad Akhtar
Original Paper
  • 99 Downloads

Abstract

The gene-encoding Indole-3-glycerol phosphate synthase, a key enzyme involved in the cyclization of 1-(o-carboxyphenylamino)-1-deoxyribulose 5-phosphate, from Pyrococcus furiosus was cloned and expressed in Escherichia coli. The gene product was produced in the soluble and active form. The recombinant protein, purified to apparent homogeneity, displayed highest activity at 100 °C and pH of 5.5. The recombinant enzyme followed Michaelis–Menten kinetics exhibiting apparent Vmax and Km values of 20 ± 0.5 μmol min−1 mg−1 and 140 ± 10 µM, respectively. The activation energy, determined from the linear Arrhenius plot, was 17 ± 0.5 kJ mol−1. A unique property of PfInGPS is its stability against denaturants and temperature. There was no significant change in activity even in the presence of 8 M urea or 5 M guanidine hydrochloride. Furthermore, recombinant PfInGPS was highly thermostable with a half-life of 200 min at 100 °C. To the best of our knowledge, this is the most stable indole-3-glycerol phosphate synthase characterized to date.

Keywords

Pyrococcus furiosus Indole-3-glycerol phosphate synthase TrpC Gene expression Thermostability 

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Copyright information

© Springer Japan KK, part of Springer Nature 2018

Authors and Affiliations

  • Muhammad Arif
    • 1
  • Naeem Rashid
    • 1
    Email author
  • Sumera Perveen
    • 1
  • Qamar Bashir
    • 1
  • Muhammad Akhtar
    • 2
  1. 1.School of Biological SciencesUniversity of the PunjabLahorePakistan
  2. 2.School of Biological SciencesUniversity of SouthamptonSouthamptonUK

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