Recruiting a new strategy to improve levan production in Bacillus amyloliquefaciens

Scientific Reports
Jun FengShufang Wang

Abstract

Microbial levan is an important biopolymer with considerable potential in food and medical applications. Bacillus amyloliquefaciens NK-ΔLP strain can produce high-purity, low-molecular-weight levan, but production is relatively low. To enhance the production of levan, six extracellular protease genes (bpr, epr, mpr, vpr, nprE and aprE), together with the tasA gene (encoding the major biofilm matrix protein TasA) and the pgsBCA cluster (responsible for poly-γ-glutamic acid (γ-PGA) synthesis), were intentionally knocked out in the Bacillus amyloliquefaciens NK-1 strain. The highest levan production (31.1 g/L) was obtained from the NK-Q-7 strain (ΔtasA, Δbpr, Δepr, Δmpr, Δvpr, ΔnprE, ΔaprE and ΔpgsBCA), which was 103% higher than that of the NK-ΔLP strain (ΔpgsBCA) (15.3 g/L). Furthermore, the NK-Q-7 strain also showed a 94.1% increase in α-amylase production compared with NK-ΔLP strain, suggesting a positive effect of extracellular protease genes deficient on the production of endogenously secreted proteins. This is the first report of the improvement of levan production in microbes deficient in extracellular proteases and TasA, and the NK-Q-7 strain exhibits outstanding characteristics for extracellular protein production or ext...Continue Reading

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Citations

May 19, 2018·Bioprocess and Biosystems Engineering·Burak Adnan ErkorkmazEbru Toksoy Öner
Jul 21, 2017·Microbial Cell Factories·Shaomin Yan, Guang Wu
Nov 9, 2018·Journal of Industrial Microbiology & Biotechnology·Hui WangBin Yao
Apr 13, 2018·Omics : a Journal of Integrative Biology·Busra AydinKazim Yalcin Arga
Jan 7, 2021·Applied Microbiology and Biotechnology·Rui ChengJianfa Zhang

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Datasets Mentioned

BETA
GM2163

Methods Mentioned

BETA
genetic modification
PCR
gene knockout

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