基于细菌的生物控制剂通过生物降解性抗菌剂杀死病原体,这些抗菌剂来自麦克罗拉克家族
Elena B Guglya1, Olga A Belozerova1, Anton E Shikov2,3
1Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Miklukho-Maklaya 16/10, 117997 Moscow, Russia.
International journal of molecular sciences
|November 27, 2025
概括
百日菌 velezensis K-3618 产生巨乳素,强大的抗微生物药物对抗耐药细菌. 乙基化麦克罗拉克丁表现出增强的活性,但病原体降解降低了疗效,凸显了需要稳定的合成类似物.
科学领域:
- 微生物学和农业科学 微生物学和农业科学
- 自然产品化学 自然产品化学
- 细菌的新陈代谢和生态学
背景情况:
- 有机农业越来越依赖于生物控制剂,如Bacillus菌株.
- 许多细菌菌株的特定活性化合物和机制仍然不太清楚.
- 细菌 velezensis K-3618 是有机农业的一个关键菌株,需要更深入地了解其功能.
研究的目的:
- 为了阐明Bacillus velezensis K-3618.18的抗菌代谢物谱.
- 确定负责该菌株生物控制特性的主要活性物质.
- 研究已识别的抗微生物化合物的作用机制和结构-活性关系.
主要方法:
- 对B. velezensis K-3618.18的抗菌代谢物谱的详细分析.
- 使用分析技术识别和表征麦克罗拉克丁家族化合物.
- 在体外抗菌活性测定对包括MRSA在内的格拉姆阳性病原体,以及对作用机制的调查 (蛋白转化抑制).
主要成果:
- 由B. velezensis K-3618产生的主要抗菌药物是麦克罗拉克A (MLN A) 和其乙烯基衍生物:7-O-马洛尼尔麦克罗拉克A (mal-MLN A) 和7-O-苏基尼尔麦克罗拉克A (suc-MLN A).
- 苏克-MLN A对抗抗甲素的黄金葡萄球菌 (MRSA) 具有强烈的活性,最小抑制度 (MIC) 为0.1μg/mL.
- 乙基化麦克罗拉克丁在无细胞系统中表现出增强的活性,但易受病原体介导的生物转化到不那么活跃的MLN F类似物,表明稳定性降低.
结论:
- 麦克罗拉克丁,特别是suc-MLN A,是B. velezensis K-3618产生的关键抗菌剂,有效对抗多药耐药的格拉姆阳性细菌.
- 蛋白转化抑制是MLN A基麦克罗拉克丁的主要作用机制.
- 优化抗微生物药物的疗效需要对抗菌素中介降解的活性和稳定,以提高稳定性和治疗潜力.
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