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-  2017 

牛溶菌肽线性衍生物 Bac2a 的生物特性及其稳定性研究

DOI: doi:10.7507/1001-5515.201609002

Keywords: Bac2a 肽, 抑菌活性, 溶血活性, 细胞毒性, 稳定性

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Abstract:

本研究以牛中性粒细胞牛溶菌肽的线性衍生物 Bac2a 为研究对象,以蜂毒素为对照肽,探讨 Bac2a 的生物特性及其稳定性。采用圆二色谱法、微量稀释法、噻唑蓝(MTT)法等方法测定了 Bac2a 的二级结构、抑菌活性、溶血活性、细胞毒性及其稳定性。研究结果表明:Bac2a 在水溶液中呈无规则卷曲状,在疏水环境中则呈 α-螺旋结构;Bac2a 的抑菌作用较强,最小抑菌浓度(MIC)为 2~32 μmol/L;当肽浓度为 64 μmol/L 时,其溶血率较低,仅为 14.81%;细胞毒性小,治疗指数为 3.26,细胞选择性较强;100℃ 处理 1 h 后,Bac2a 依然保持较强的抑菌活性,热稳定性好。因此,Bac2a 在食品、医药和其它领域都具有良好的应用前景,有望成为抗生素替代品

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