Isolation and Characterization of a New Thermoalkalophilic Lipase From Soil Bacteria



Rabbani M¹ ; Shafiee F¹ ; Shayegh Z¹ ; Sadeghia HMM¹ ; Shariat ZS² ; Etemadifa Z³ ; Moazena F¹ Show Affiliations
Source: Iranian Journal of Pharmaceutical Research Published:2015

Abstract

Lipases are diversified enzymes in their properties and substrate specificity, which make them attractive tools for various industrial applications. In this study, an alkalinethermostable lipase producing bacteria were isolated from soil of different regions of Isfahan province (Iran) and its lipase was purified by ammonium sulfate precipitation and ion exchange chromatography. To select a thermoalkalophil lipase producing bacterium, Rhodamine B and Horikoshi media were used and the strain that can grow at 45 °C was selected. The isolated strain was identified using microbial and biochemical tests. One strain showed an orange colored zone on plate and grew on Horikoshi plate. Microbial and biochemical tests showed that the isolated strain was Bacillus subtilis, a Gram positive rod. In PCR, an expected band was obtained with about 371 bp. The activity of the purified lipase was 10.2 folds that of the standard enzyme using ammonium sulfate precipitation and ion exchange chromatography. The molecular weight of lipase determined by SDS-PAGE electrophoresis, was 21 and 35 KDa. Existence of two bands in SDS-PAGE electrophoresis and low amount of obtained purified enzyme highlights the necessity of optimization of purification and concentrating process. © 2015 by School of Pharmacy Shaheed Beheshti University of Medical Sciences and Health Service.