Comparison of 16S-Its rDna Rflp profiles of bacillus sp. isolated from milk and different water sources

Abstract

The aim of this research was the isolation of thermophilic Bacillus sp. from different sources and grouping by 16S-ITS rDNA RFLP. Seventy-four thermophilic strains were isolated from various environmental samples. Since fifteen isolated strains were Gram (+), endospore forming rods, they were identified as Bacillus sp. These strains were screened for the existence of five extracellular enzyme activities. These were, lipases, amylases, proteases, xylanases, cellulases. 16S-ITS rDNA RFLP profiles were produced by using two restriction endonucleases Taq I and Hae III. The isolated strains were clustered into eigth groups by Taq I restriction profiles of 16S-ITS rDNA while seven groups were obtained by Hae III digestion profiles.Bu çalışmanın amacı farklı kaynaklardan izole edilen termofilik Bacillus sp.'ları 16S-ITS rDNA RFLP ile gruplandırmaktır. Çeşitli çevresel örneklerden yetmiş dört suş izole edilmiştir. Gram (+), endospor oluşturan, basil şeklindeki izolatlar Bacillus olarak identifiye edilmiştir Bu suşlar; lipaz, amilaz, proteaz, ksilinaz ve selulazdan oluşan ekstraselülar beş enzim aktivitesi açısından incelenmiştir. 16S-ITS rDNA RFLP profilleri TaqI ve HaeIII olmak üzere iki farklı restriksiyon enzimi kullanılarak çıkarılmıştır. İzolatlar TaqI ile sekiz, HaeIII ile yedi farklı restriksiyon grubu oluşturmuştur.