Insights into buforin II membrane translocation from molecular dynamics simulations.

Insights into buforin II membrane translocation from molecular dynamics simulations.
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DOI:
10.1016/j.peptides.2012.09.022
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发表时间:
2012-12
期刊:
影响因子:
3
通讯作者:
Elmore DE
Elmore DE
中科院分区:
医学3区
文献类型:
--
作者:
Elmore DE

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Buforin II是一种组蛋白衍生的抗微生物肽,其容易跨脂质膜易位而不引起显著的膜透化。以前的研究表明,突变buforin II的唯一脯氨酸显着降低其易位。同样,研究人员提出,肽通过形成瞬时环形孔以合作的方式穿过膜。本文报道了分子动力学模拟,旨在调查的结构buforin II膜进入后,并评估肽是否能够形成环形孔结构。这些模拟表明蛋白质-脂质相互作用和增加的buforin N-末端区域的脯氨酸促进的结构变形之间的关系。此外,模拟与多个肽显示buforin II可以深深嵌入膜,并可能形成环形孔。总之,这些模拟提供了结构洞察buforin II的易位过程中,除了提供更一般的洞察脯氨酸可以发挥抗菌肽的作用。
Buforin II is a histone-derived antimicrobial peptide that readily translocates across lipid membranes without causing significant membrane permeabilization. Previous studies showed that mutating the sole proline of buforin II dramatically decreases its translocation. As well, researchers have proposed that the peptide crosses membranes in a cooperative manner through forming transient toroidal pores. This paper reports molecular dynamics simulations designed to investigate the structure of buforin II upon membrane entry and evaluate whether the peptide is able to form toroidal pore structures. These simulations showed a relationship between protein-lipid interactions and increased structural deformations of the buforin N-terminal region promoted by proline. Moreover, simulations with multiple peptides show how buforin II can embed deeply into membranes and potentially form toroidal pores. Together, these simulations provide structural insight into the translocation process for buforin II in addition to providing more general insight into the role proline can play in antimicrobial peptides.
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