In vitro enzymatic response of Turkish native chicken "Gerze" to heavy metal exposure

Mercan L., Okumus A., Senturk M., EKİNCİ D.

JOURNAL OF ENZYME INHIBITION AND MEDICINAL CHEMISTRY, cilt.28, sa.1, ss.52-57, 2013 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 28 Sayı: 1
  • Basım Tarihi: 2013
  • Doi Numarası: 10.3109/14756366.2011.627509
  • Dergi Adı: JOURNAL OF ENZYME INHIBITION AND MEDICINAL CHEMISTRY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.52-57
  • Anahtar Kelimeler: Glucose-6-phosphate dehydrogenase, purification, chicken, metal ions, KINETIC-PROPERTIES, GLUTATHIONE-REDUCTASE, RAINBOW-TROUT, MALIC ENZYME, GLUCOSE-6-PHOSPHATE-DEHYDROGENASE, PURIFICATION, ERYTHROCYTES, LIVER, EXPRESSION, PROTEINS
  • Ondokuz Mayıs Üniversitesi Adresli: Evet

Özet

Glucose-6-phosphate dehydrogenase (G6PD) was purified and characterized from the Turkish native chicken, Gerze, erythrocytes for the first time, and some characteristics were investigated. Purification procedure consisted of ammonium sulphate fractionation and affinity chromatography on 29, 59-ADP Sepharose-4B. The enzyme was purified 1063.22-fold with a yield of 43.27% and specific activity of 93.5 EU/mg proteins. Kinetic parameters of the enzyme were determined with glucose-6-phosphate (G6P) as substrate and purified enzyme had an apparent K-M and V-max values of 0.222 mM and 0.097 U/ml, respectively. The same parameters were determined with NADP(+) and the K-M and V-max values were 0.0603 mM and 0.153 U/ml, respectively. The following metals, Cd+2, Pb+2, Hg+2, Cu+2, Zn+2 and Fe+3 showed inhibitory effects on the enzyme. Cd+2 and Pb+2 exhibited the strongest inhibitory action. Hg+2 and Cu+2 were moderate inhibitors, whereas Zn+2 and Fe+3 showed weaker actions. All tested metals inhibited the enzyme in competitive manner.