副溶血性弧菌
赖氨酸
最小抑制浓度
重组DNA
微生物学
抗菌活性
细菌
最低杀菌浓度
肽聚糖
抗菌剂
化学
弧菌
生物
大肠杆菌
生物化学
噬菌体
基因
遗传学
作者
Hou-Qi Ning,Jing Zhang,Yinfeng Wang,Hong Lin,Jingxue Wang
出处
期刊:Food Control
[Elsevier]
日期:2022-11-01
卷期号:146: 109521-109521
标识
DOI:10.1016/j.foodcont.2022.109521
摘要
Novel artilysins by the fusions of phage lysin Lysqdvp001 (Lys) with outer membrane (OM) destabilizing peptides against Vibrio parahaemolyticus ( V. parahaemolyticus ) were designed and developed assisted by molecular docking. Eleven designed artilysins with predicted high affinity to lipopolysaccharide lipid-A (LPSA) of bacterial OM were selected, and eight designed artilysins after cloning and expression showed abilities to hydrolyze V. parahaemolyticus peptidoglycan (PG). After purification, highly purified artilysins HPP-Lys, SM29-Lys, EC2-Lys, M78-Lys, M21F-Lys and sTHA-Lys (purity >90%) with molecular weights of about 30–35 kDa were finally obtained. These recombinant artilysins, except HPP-Lys, displayed good antibacterial activities against V. parahaemolyticus . The sTHA-Lys exhibited the strongest antibacterial activity among these artilysins with 50 μg/mL of minimal inhibitory concentration (MIC) and minimal bactericidal concentration (MBC) as well as a wider antibacterial spectrum. Besides, sTHA-Lys at MIC and 2 MIC completely inactivated V. parahaemolyticus in buffer and reduced 1.78 and 3.59 log 10 CFU/mL of the bacteria in the oyster homogenates. Treatments of sTHA-Lys at MIC and 2 MIC also removed more than 82% of mature biofilms of V. parahaemolyticus and almost completely inhibited the formation of the bacterial biofilms. Engineered artilysins based on phage lysins and OM destabilizing peptides might be a promising candidate for antibacterial agent against V. parahaemolyticus contaminations in food industry. • Artilysins target V. parahaemolyticus were designed via computer-aided methods. • Six recombinant artilysins with high purity were finally screened and obtained. • sTHA-Lys exhibited highest antibacterial activity among the obtained artilysins. • sTHA-Lys effectively inactivated the bacteria in buffer and oyster homogenates. • sTHA-Lys effectively eradicated the bacterial mature biofilms.
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