Characterization of Novel Alkaline Protease producing <i>Bacillus subtilis</i> C3a-FIIRO with Potential for Industrial Application

Abstract

Microbial alkaline protease is one of the dominant industrial enzymes which function in splitting polypeptides chain of protein into monomers of amino acids and peptides. This study aimed to identify alkaline protease produced by Bacillus sp. Soil samples were aseptically collected from dump sites in FIIRO, Lagos state, Nigeria. The samples were serially diluted, and bacteria were isolated using pour plate method. The resulting isolates were screened and morphologically characterized. The isolate with the highest protease production potential was subjected to biochemical characterization using Analytical Profile Index (API) identification kit system and 16S rRNA sequencing. The selected isolate was used to produce alkaline protease by solid state fermentation using rice bran as a substrate. Out of the 18 bacteria isolated, 11 isolates showed alkaline protease production potential. Isolate C3a-FIIRO was selected for its maximal alkaline protease produced as indicated by a 56 mm zone of clearance. Morphological and biochemical characterization revealed isolate C3a-FIIRO as a member of the genus Bacillus. The 16S rRNA gene sequencing confirmed the isolate as Bacillus subtilis C3aFIIRO (MW577298) with closest homology to Bacillus subtilis Y17B. The enzyme activity of 6848.171 U/ml ± 0.11 and protein concentration of 152.13 mg/ml ± 0.003 showed that Bacillus subtilis C3a-FIIRO has potential for sustainable alkaline protease production.