One of the important hydrolytic enzymes are proteases that slice peptide bonds between amino acid residues. Proteases have various industrial applications including detergent, food, pharmaceutical, leather and diagnostic reagent industries. Among them, the most commercialized enzymes are alkaline proteases in the industry. Due to their potential applications in the detergent industry as cleaning additives, they are of particular interest. In this study, a novel protease from Bacillus sp. strain EL-GU1 was reported showing highest activity at pH 6 and 20°C. The novel protease was purified by using ammonium sulfate precipitation and identified by 16S rDNA sequencing. Highest activity was observed as 3300 µmol/min-1 mg-1 when casein used as a substrate. Kinetic parameters of the enzyme were determined; K M , V max , k cat and catalytic efficiency values were calculated as 1.4 mM, 1 mM/s, 2.10-7 s-1 , 0.14 10-7 s-1 M-1 , respectively. These results indicated that the novel cold active protease from Bacillus sp. strain EL-GU1 can be a good candidate for the detergent industry.
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