Relationship between oligoarginine-induced membrane damage of single Escherichia coli cells and entry of the peptide into the cytoplasm

IF 2.3 Q3 BIOCHEMISTRY & MOLECULAR BIOLOGY Biochemistry and Biophysics Reports Pub Date : 2024-07-09 DOI:10.1016/j.bbrep.2024.101777
Sabrina Sharmin , Md. Zahidul Islam , Masahito Yamazaki
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Abstract

Cell-penetrating peptides (CPPs) can enter the cytosol of eukaryotic cells without killing them whereas some CPPs exhibit antimicrobial activity against bacterial cells. Here, to elucidate the mode of interaction of the CPP nona-arginine (R9) with bacterial cells, we investigated the interactions of lissamine rhodamine B red-labeled peptide (Rh-R9) with single Escherichia coli cells encapsulating calcein using confocal laser scanning microscopy. After Rh-R9 induced the leakage of a large amount of calcein, the fluorescence intensity of the cytosol due to Rh-R9 greatly increased, indicating that Rh-R9 induces cell membrane damage, thus allowing entry of a significant amount of Rh-R9 into the cytosol. To determine if the lipid bilayer region of the membrane is the main target of Rh-R9, we then investigated the interaction of Rh-R9 with single giant unilamellar vesicles (GUVs) comprising an E. coli polar lipid extract containing small GUVs and AlexaFluor 647 hydrazide (AF647) in the lumen. Rh-R9 entered the GUV lumen without inducing AF647 leakage, but leakage eventually did occur, indicating that GUV membrane damage was induced after the entry of Rh-R9 into the GUV lumen. The Rh-R9 peptide concentration dependence of the fraction of entry of Rh-R9 after a specific interaction time was similar to that of the fraction of leaking GUVs. These results indicate that Rh-R9 can damage the lipid bilayer region of a cell membrane, which may be related to its antimicrobial activity.

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寡精氨酸诱导的单个大肠杆菌细胞膜损伤与肽进入细胞质之间的关系
细胞穿透肽(CPPs)可以进入真核细胞的细胞膜而不杀死细胞,而一些CPPs则对细菌细胞具有抗菌活性。在此,为了阐明 CPP 壬精肽(R9)与细菌细胞的相互作用模式,我们使用激光共聚焦扫描显微镜研究了利萨明罗丹明 B 红标记肽(Rh-R9)与包裹钙黄素的单个大肠杆菌细胞的相互作用。在 Rh-R9 诱导大量钙蓝蛋白泄漏后,Rh-R9 引起的细胞膜荧光强度大大增加,表明 Rh-R9 诱导细胞膜损伤,从而使大量 Rh-R9 进入细胞膜。为了确定膜的脂质双分子层区域是否是 Rh-R9 的主要靶标,我们随后研究了 Rh-R9 与单个巨型单酰胺囊泡 (GUV) 的相互作用,该囊泡由大肠杆菌极性脂质提取物组成,内含小 GUV 和管腔中的 AlexaFluor 647 hydrazide (AF647)。Rh-R9 进入 GUV 管腔后并没有诱导 AF647 泄漏,但最终还是发生了泄漏,这表明 Rh-R9 进入 GUV 管腔后诱导了 GUV 膜损伤。在特定的相互作用时间后,Rh-R9 进入 GUV 的部分与 Rh-R9 肽浓度的相关性与 GUV 泄漏部分的相关性相似。这些结果表明,Rh-R9 能破坏细胞膜的脂质双分子层区域,这可能与其抗菌活性有关。
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来源期刊
Biochemistry and Biophysics Reports
Biochemistry and Biophysics Reports Biochemistry, Genetics and Molecular Biology-Biophysics
CiteScore
4.60
自引率
0.00%
发文量
191
审稿时长
59 days
期刊介绍: Open access, online only, peer-reviewed international journal in the Life Sciences, established in 2014 Biochemistry and Biophysics Reports (BB Reports) publishes original research in all aspects of Biochemistry, Biophysics and related areas like Molecular and Cell Biology. BB Reports welcomes solid though more preliminary, descriptive and small scale results if they have the potential to stimulate and/or contribute to future research, leading to new insights or hypothesis. Primary criteria for acceptance is that the work is original, scientifically and technically sound and provides valuable knowledge to life sciences research. We strongly believe all results deserve to be published and documented for the advancement of science. BB Reports specifically appreciates receiving reports on: Negative results, Replication studies, Reanalysis of previous datasets.
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