Aspartate inhibits Staphylococcus aureus biofilm formation.

Aspartate inhibits Staphylococcus aureus biofilm formation.
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天冬氨酸抑制金黄色葡萄球菌生物膜的形成。

DOI:
10.1093/femsle/fnv025
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发表时间:
2015-04
影响因子:
2.1
通讯作者:
Wei Hongping
Wei Hongping
中科院分区:
生物学4区
文献类型:
--
作者:
Yang Hang;Wang Mengyue;Yu Junping;Wei Hongping

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生物膜的形成使金黄色葡萄球菌对常规抗生素和宿主防御具有高度抗性。已报道四种D-氨基酸(D-Leu、D-Met、D-Trp和D-Tyr)能够抑制生物膜形成并分解已建立的S.金黄色葡萄球菌生物膜本文首次报道了天冬氨酸(Asp)的D-和L-异构体抑制S。金黄色葡萄球菌生物膜形成。对其他葡萄球菌菌株也观察到类似的生物膜抑制作用,包括S。sagitticus、S. equorum,S. chromogenes和S.溶血性结果发现,高浓度(>10 mM)的Asp可抑制N 315细胞的生长,但在亚抑制浓度下,可降低细胞的代谢活性,而不影响细胞的生长。细胞代谢活性的降低可能是Asp存在下形成的生物膜基质中蛋白质和DNA产量减少的原因。然而,观察到不同的抑制效果的Asp的临床葡萄球菌分离株形成的生物膜。除了降低代谢活性外,可能还有其他机制,例如生物膜表型,在存在Asp的情况下影响生物膜形成。
Biofilm formation renders Staphylococcus aureus highly resistant to conventional antibiotics and host defenses. Four D-amino acids (D-Leu, D-Met, D-Trp and D-Tyr) have been reported to be able to inhibit biofilm formation and disassemble established S. aureus biofilms. We report here for the first time that both D- and L-isoforms of aspartate (Asp) inhibited S. aureus biofilm formation on tissue culture plates. Similar biofilm inhibition effects were also observed against other staphylococcal strains, including S. saprophyticus, S. equorum, S. chromogenes and S. haemolyticus. It was found that Asp at high concentrations (>10 mM) inhibited the growth of planktonic N315 cells, but at subinhibitory concentrations decreased the cellular metabolic activity without influencing cell growth. The decreased cellular metabolic activity might be the reason for the production of less protein and DNA in the matrix of the biofilms formed in the presence of Asp. However, varied inhibition efficacies of Asp were observed for biofilms formed by clinical staphylococcal isolates. There might be mechanisms other than decreasing the metabolic activity, e.g. the biofilm phenotypes, affecting biofilm formation in the presence of Asp.
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