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High yield recombinant thermostable α-amylase production using an improved Bacillus licheniformis system

Author(s): Niu Dandan | Zuo Zhirui | Shi Gui-Yang | Wang Zheng-Xiang

Journal: Microbial Cell Factories ISSN 1475-2859
Volume: 8; Issue: 1; Start page: 58; Date: 2009;
Original page

ABSTRACT
Abstract Background Some strains of Bacillus licheniformis have been improved by target-directed screening as well as by classical genetic manipulation and used in commercial thermostable α-amylase and alkaline protease production for over 40 years. Further improvements in production of these enzymes are desirable. Results A new strain of B. licheniformis CBBD302 carrying a recombinant plasmid pHY-amyL for Bacillus licheniformis α-amylase (BLA) production was constructed. The combination of target-directed screening and genetic recombination led to an approximately 26-fold improvement of BLA production and export in B. licheniformis. Furthermore, a low-cost fermentation medium containing soybean meal and cottonseed meal for BLA production in shake-flasks and in a 15 liter bioreactor was developed and a BLA concentration of up to 17.6 mg per ml growth medium was attained. Conclusion This production level of BLA by B. licheniformis CBBD302(pHY-amyL) is amongst the highest levels in Gram-positive bacteria reported so far.