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Dergiler / Turkish Journal of Chemistry / 2014 / Cilt: 38 - Sayı: 4

Partial purification and biochemical characterization of an extremely thermo- and pH-stable esterase with great substrate affinity

Esra ÖZBEK
Yakup KOLCUOĞLU
Leyla KONAK
Ahmet ÇOLAK
Fulya ÖZ
Sayfa
538–546
Yayın Tarihi
2014-04-01
DOI
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Therefore, the stability and Km value of the enzyme make this study interesting when compared with the literature.

📌 3 Maddede Bu Makale

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Amaç & Hipotez:An esterase from a thermophilic bacterium, Geobacillus sp.
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Temel Bulgular & Veri:DF20, was partially purified.
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Sonuç & Katkı:Therefore, the stability and Km value of the enzyme make this study interesting when compared with the literature.
🔬Tür:Araştırma Makalesi
📍Kapsam:Genişletilmiş Akademik Örneklem
⚙️Değişkenler:Thermophilic · esterase · Geobacillus sp.

Özet

An esterase from a thermophilic bacterium, Geobacillus sp. DF20, was partially purified. Final purification factor was found to be 64.5-fold using Q-Sepharose ion exchange column chromatography. Native polyacrylamide gel electrophoresis indicated the presence of a single active esterase. The substrate specificity of this esterase was high for p-nitrophenyl butyrate (pNPB) substrate. The optimum pH and temperature for the enzyme activity were 7.0 and 50 °C, respectively. The pH and heat stability profiles show that this enzyme is more stable under neutral conditions at 50 °C. Km and Vmax values for this esterase acting on pNPB were 0.12 mM and 54.6 U/mg protein, respectively. Presence of 10 % (v/v) acetonitrile in the reaction medium indicated that purified enzyme was strongly inhibited. It was also detected that some metal ions affected enzyme activity at different rates. As a result, it was observed that esterase from Geobacillus sp. DF20 has extreme temperature and pH stabilities. Therefore, the stability and Km value of the enzyme make this study interesting when compared with the literature.

Abstract

An esterase from a thermophilic bacterium, Geobacillus sp. DF20, was partially purified. Final purification factor was found to be 64.5-fold using Q-Sepharose ion exchange column chromatography. Native polyacrylamide gel electrophoresis indicated the presence of a single active esterase. The substrate specificity of this esterase was high for p-nitrophenyl butyrate (pNPB) substrate. The optimum pH and temperature for the enzyme activity were 7.0 and 50 °C, respectively. The pH and heat stability profiles show that this enzyme is more stable under neutral conditions at 50 °C. Km and Vmax values for this esterase acting on pNPB were 0.12 mM and 54.6 U/mg protein, respectively. Presence of 10 % (v/v) acetonitrile in the reaction medium indicated that purified enzyme was strongly inhibited. It was also detected that some metal ions affected enzyme activity at different rates. As a result, it was observed that esterase from Geobacillus sp. DF20 has extreme temperature and pH stabilities. Therefore, the stability and Km value of the enzyme make this study interesting when compared with the literature.

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Bu Makaleye Atıf Yap

ÖZBEK, E., KOLCUOĞLU, Y., KONAK, L., ÇOLAK, A., ÖZ, F. (2014). Partial purification and biochemical characterization of an extremely thermo- and pH-stable esterase with great substrate affinity. Turkish Journal of Chemistry, Cilt: 38 - Sayı: 4, 538–546. https://ajindex.com/articles/185327

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