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Updated: Jun 13, 2025

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D-氨酸的合成和外源氨酸会影响Staphylococcus aureus的抗菌敏感性

Yujin Suzuki^1,2, Miki Kawada-Matsuo^1,3, Vy Ton That Thuan¹

¹Department of Bacteriology, Hiroshima University Graduate School of Biomedical and Health Sciences, Hiroshima, Japan.

Antimicrobial agents and chemotherapy

|June 12, 2025

概括

黄金葡萄球菌中D-氨酸缺乏会损害酸甘氨酸,增加细胞表面的负电荷,导致对β-乳酸胺和氨基糖化物等抗生素的敏感性更大.

科学领域:

微生物学微生物学
生物化学生物化学
分子生物学分子生物学

背景情况:

D-氨酸对于黄金葡萄球菌 (Staphylococcus aureus) 中的糖甘合成和铁酸改性至关重要.
D-氨酸会影响细胞表面电荷,影响对抗菌剂的敏感性.
关键酶 (氨酸赛马酶,D-氨基酸转氨酶) 和转运体 (CycA) 都参与了D-氨酸的代谢.

研究的目的:

为了研究D-alanine可用性和Staphylococcus aureus中的抗菌素敏感性之间的关系.
阐明D-alanine在维持细胞壁完整性和表面电荷方面的作用.

主要方法:

构建和分析具有不活化基因 (alr1,dat,cycA) 的金黄色葡萄球菌突变体,参与D-氨酸的合成和吸收.
对这些突变物种对各种抗生素类别的抗微生物敏感性概况的评估.
在野生型和突变菌株中测量细胞表面电荷.
在氨酸贫乏介质和临床MRSA菌株中对抗微生物敏感性的评估.

主要成果:

缺乏alr1或cycA的突变体对β-乳糖胺,D-环素,细菌素,lysostaphin和阴离子抗菌剂的敏感性增加.
在 Δalr1 和 ΔcycA 突变体中观察到净负细胞表面电荷的显著增加.
在生长介质中氨酸的耗尽降低了西林和甘他的最小抑制度 (MIC),特别是在临床MRSA菌株中.

结论:

缺乏D-氨酸会影响酸甘油的生物合成,并增加Staphylococcus aureus细胞表面的负电荷.
这些变化导致对广泛的抗微生物药物的敏感性增加.
向D-氨酸代谢可能是一个新的策略,以提高现有的抗生素对S. aureus感染的疗效.

关键词:

D-阿拉宁 D-阿拉宁是一种在MRSA中,MRSA可能是MRSA.黄金葡萄球菌黄金葡萄球菌

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