Karlsruhe Institute of Technology (KIT), Institute of Biological Interfaces IBG-2, P.O. Box 3640, 76021 Karlsruhe, Germany.
Karlsruhe Institute of Technology (KIT), Institute of Organic Chemistry, Fritz-Haber-Weg 6, 76131 Karlsruhe, Germany.
Int J Mol Sci. 2022 Apr 20;23(9):4544. doi: 10.3390/ijms23094544.
The lateral pressure profile constitutes an important physical property of lipid bilayers, influencing the binding, insertion, and function of membrane-active peptides, such as antimicrobial peptides. In this study, we demonstrate that the lateral pressure profile can be manipulated using the peptides residing in different regions of the bilayer. A F-labeled analogue of the amphiphilic peptide PGLa was used to probe the lateral pressure at different depths in the membrane. To evaluate the lateral pressure profile, we measured the orientation of this helical peptide with respect to the membrane using solid-state F-NMR, which is indicative of its degree of insertion into the bilayer. Using this experimental approach, we observed that the depth of insertion of the probe peptide changed in the presence of additional peptides and, furthermore, correlated with their location in the membrane. In this way, we obtained a tool to manipulate, as well as to probe, the lateral pressure profile in membranes.
侧向压力分布是脂质双层的一个重要物理特性,影响着膜活性肽(如抗菌肽)的结合、插入和功能。在这项研究中,我们证明可以通过位于双层不同区域的肽来操纵侧向压力分布。使用荧光标记的两亲肽 PGLa 的类似物来探测膜中不同深度处的侧向压力。为了评估侧向压力分布,我们使用固态 F-NMR 测量了该螺旋肽相对于膜的取向,这表明其插入双层的程度。使用这种实验方法,我们观察到在存在其他肽的情况下探针肽的插入深度发生了变化,并且与它们在膜中的位置相关。通过这种方式,我们获得了一种操纵和探测膜中侧向压力分布的工具。