Divalent metal ion triggered activity of a synthetic antimicrobial in cardiolipin membranes.

Divalent metal ion triggered activity of a synthetic antimicrobial in cardiolipin membranes.
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DOI:
10.1021/ja9067063
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发表时间:
2009-10-28
影响因子:
15
通讯作者:
Tew, Gregory N.
Tew, Gregory N.
中科院分区:
化学1区
文献类型:
--
作者:
Som, Abhigyan;Yang, Lihua;Wong, Gerard C. L.;Tew, Gregory N.

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一个典型的抗菌低聚物类的成员被用来研究富含心磷脂的膜中的孔形成。使用囊泡染料泄漏分析和小角x射线散射,双层重塑进行了研究。结果表明,负固有曲率(NIC)脂质的存在对于这类分子的孔形成是必不可少的:在革兰氏阳性细菌中,需要心磷脂和二价金属阳离子如Ca2+和Mg2+。这与磷脂酰乙醇胺(PE)脂质在革兰氏阴性菌中的作用完全一致,其中抗微生物活性取决于PE的负固有曲率,而不是与PE的特异性相互作用。
One member of a prototypical class of antimicrobial oligomers was used to study pore formation in cardiolipin rich membranes. Using both vesicle dye-leakage assays and small angle x-ray scattering, bilayer remodeling was studied. The results indicate that the presence of negative intrinsic curvature (NIC) lipids is essential for pore formation by this class of molecules: In Gram-positive bacteria, cardiolipin and divalent metal cations like Ca2+ and Mg2+ are needed. This is completely consistent with the role of phosphatidylethanolamine (PE) lipid in Gram-negative bacteria, where antimicrobial activity is dependent on the negative intrinsic curvature of PE, rather than a specific interaction with PE.
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