Overexpression of Bacillus circulans alkaline protease in Bacillus subtilis and its potential application for recovery of protein from soybean dregs

Abstract

Proteases are important for decomposition of proteins to generate peptides or amino acids and have a broad range of applications in different industries. Herein, a gene encoding an alkaline protease (AprBcp) from Bacillus circulans R1 was cloned and bioinformatics analyzed. In addition, a series of strategies were applied to achieve high-level expression of AprBcp in Bacillus subtilis. The maximum activity of AprBcp reached 165,870 U/ml after 60 h fed-batch cultivation in 50 l bioreactor. The purified recombinant AprBcp exhibited maximum activity at 60°C and pH 10.0, and remained stable in the range from pH 8.0 to 11.0 and 30 to 45°C. Metal ions Ca2+, Mn2+, and Mg2+ could improve the stability of AprBcp. Furthermore, the recombinant AprBcp displayed great potential application on the recovery of protein from soybean dregs. The results of this study will provide an effective method to prepare AprBcp in B. subtilis and its potential application on utilization of soybean dregs.

Cowhide gelatin peptide as a source of antioxidants for inhibiting the deterioration of pudding quality during storage

“…pH has an important effect on the gel system in pudding products and is a key factor in the evaluate of the product quality during storage (H. Chen, et al, 2022 ). Based on Fig.…”

The fermentation optimization for alkaline protease production by Bacillus subtilis BS-QR-052

“…While the fold increase achieved may be slightly lower compared to other process optimization strategies ( Ozdenefe et al, 2017 ), the enzyme activity still reached a significantly high level. Additionally, implementing measures such as fed-batch fermentation ( Chen et al, 2022 ) can further enhance the production of alkaline protease, highlighting the productivity advantage of B. subtilis in the field of alkaline protease production. Therefore, selecting suitable nutrients and optimizing various process conditions are crucial approaches to maximize the yield of alkaline protease produced through B. subtilis fermentation.…”