The Inhibitory Effect of Propofol on Bovine Lactoperoxidase


ŞİŞECİOĞLU M. , ÇANKAYA M., GÜLÇİN İ. , ÖZDEMİR H.

PROTEIN AND PEPTIDE LETTERS, vol.16, no.1, pp.46-49, 2009 (Journal Indexed in SCI) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 16 Issue: 1
  • Publication Date: 2009
  • Doi Number: 10.2174/092986609787049394
  • Title of Journal : PROTEIN AND PEPTIDE LETTERS
  • Page Numbers: pp.46-49

Abstract

Propofol (2,6-diisopropylphenol) is a hypnotic intravenous agent with in vivo antioxidant properties. This study was undertaken to examine the in vitro effect of propofol on lactoperoxidase (LPO; E.C. 1.11.1.7) obtained from bovine milk. Lactoperoxidase was purified with three purification steps: Amberlite CG-50 resin, CM-Sephadex C-50 ion-exchange chromatography and Sephadex G-100 gel filtration chromatography, respectively. Lactoperoxidase was purified with a yield of 21.6%, a specific activity of 34 EU/mg proteins and 14.7-fold purification. One enzyme unit is defined as the oxidation of 1 mol ABTS per min under the assay condition (25 degrees C, pH: 6.0). To determine enzyme purity, sodium dodecyl sulphate-polyacrylamide gel electrophoresis (SDS-PAGE) was performed and single band was observed. The effect of propofol on lactoperoxidase were determined using 2,2'-azino-bis (3-ethylbenzthiazoline-6 sulfonic acid) diammonium salt (ABTS) as a chromogenic substrate. The IC50 value of propofol was found as 15.97 M. Also, K-i constant for propofol was 3.72 M and propofol was found as competitive inhibitor.