Efficient production of ε-poly-L-lysine from L-lysine in Streptomyces albulus by L-lysine importer identification and overexpression

首发时间:2024-03-15
Abstract:ε-Poly-L-lysine (ε-PL) is a natural cationic antimicrobial peptide widely recognized for its potential in food preservation. Current production methods predominantly rely on de novo synthesis utilizing substrates like glucose, with some studies exploring the supplementation of lysine to enhance fermentation efficiency. However, lysine transporters have not been investigated. In this study, we employed genomic and bioinformatic strategies to pinpoint seven potential lysine transporters in S. albulus . Gene knockout experiments confirmed GL6157 as a functional lysine transporter. Overexpression of lysine transporters with different promoters increased lysine consumption by 19.3% and ε-poly-lysine yield by 10% during fermentation
keywords: Biotechnology Streptomyces albulus HMMER Lysine uptake
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小白链霉菌L-赖氨酸转运体的挖掘,鉴定并应用于聚赖氨酸生产
摘要:聚赖氨酸(ε-PL)是一种天然阳离子抗菌肽,因其在食品保鲜方面的潜力而得到广泛认可。目前的生产方法主要依赖于利用葡萄糖等底物的从头合成,也有部分研究通过补充赖氨酸提高发酵效率。然而,在链霉菌中尚没有关于赖氨酸转运体的研究。在本研究中,我们采用小白链霉菌基因组和生物信息学策略确定了七种潜在赖氨酸转运蛋白,通过基因敲除和过表达确定了GL6157为赖氨酸转运体基因,使用强启动子过表达该基因,重组菌株在发酵过程中,赖氨酸消耗量增加19.3%,聚赖氨酸产量增加10%
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小白链霉菌L-赖氨酸转运体的挖掘,鉴定并应用于聚赖氨酸生产
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