Insights into the mode of action of the two-peptide lantibiotic haloduracin.

Insights into the mode of action of the two-peptide lantibiotic haloduracin.
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DOI:
10.1021/cb900194x
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发表时间:
2009-10-16
影响因子:
4
通讯作者:
van der Donk, Wilfred A.
van der Donk, Wilfred A.
中科院分区:
生物学2区
文献类型:
--
作者:
Oman, Trent J.;van der Donk, Wilfred A.

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氟尿酸是最近发现的一种由翻译后修饰的多肽Halα和Halβ组成的双肽l抗生素,被证明对一系列革兰氏阳性菌有很高的效力,并能抑制炭疽芽孢杆菌的孢子生长。这两个多肽在1:1的化学计量比中显示出最佳的活性,并且具有与商业使用的抗生素乳链菌素相似的效力。然而,在pH值为7时,氟尿酸比乳酸链球菌素更稳定。尽管氟尿酸的两个多肽与抗生素llacticin 3147的两个多肽在结构上存在显著差异,但这两个系统在作用模式上显示出相似之处。像ltnα一样,halα与革兰氏阳性细菌表面的靶标结合,而像ltnβ一样,halβ的加入会导致毛孔形成和钾外流。使用Halα突变体,其B-和C-硫醚环被证明是重要的,但不是生物活性所必需的。Glu22的突变体也有类似的观察结果,Glu22是一种在几种脂类II结合的抗生素中高度保守的残基,如Merceidin。
Haloduracin, a recently discovered two-peptide lantibiotic composed of the post-translationally modified peptides Halα and Halβ, is shown to have high potency against a range of Gram-positive bacteria and to inhibit spore outgrowth of Bacillus anthracis. The two peptides display optimal activity in a 1:1 stoichiometry and have efficacy similar to that of the commercially used lantibiotic nisin. However, haloduracin is more stable at pH 7 than nisin. Despite significant structural differences between the two peptides of haloduracin and those of the two-peptide lantibiotic lacticin 3147, these two systems show similarities in their mode of action. Like Ltnα, Halα binds to a target on the surface of Gram-positive bacteria, and like Ltnβ, the addition of Halβ results in pore formation and potassium efflux. Using Halα mutants, its B- and C-thioether rings are shown to be important but not required for bioactivity. A similar observation was made with mutants of Glu22, a residue that is highly conserved among several lipid II-binding lantibiotics such as mersacidin.
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