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KMID : 1236020200480030358
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Microbiology and Biotechnology Letters
2020 Volume.48 No. 3 p.358 ~ p.365
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Biochemical Characterization of a Novel Alkaline and Detergent Stable Protease from Aeromonas veronii OB3
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Manni Laila
Misbah Asmae
Zouine Nouhaila
Ananou Samir
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Abstract
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An organic solvent- and bleach-stable protease-producing strain was isolated from a polluted river water sample and identified as Aeromonas veronii OB3 on the basis of biochemical properties (API 20E) and 16S rRNA sequence analysis. The strain was found to hyper-produce alkaline protease when cultivated on fish waste powder-based medium (HVSP, 4080 U/ml). The biochemical properties and compatibility of OB3 with several detergents and additives were studied. Maximum activity was observed at pH 9.0 and 60℃. The crude protease displayed outstanding stability to the investigated surfactants and oxidants, such as Tween 80, Triton X-100, and H2O2, and almost 36% residual activity when incubated with 1% SDS. Remarkably, the enzyme demonstrated considerable compatibility with commercial detergents, retaining more than 100% of its activity with Ariel and Tide (1 h, 40℃). Moreover, washing performance of Tide significantly improved by the supplementation of small amounts of OB3 crude protease. These properties suggest the potential use of this alkaline protease as a bio-additive in the detergent industry and other biotechnological processes such as peptide synthesis.
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KEYWORD
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Protease, alkaline, Aeromonas veronii, detergent, solvent-stable, fish waste medium
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