{"title":"Langmuir细菌-脂质单层的分子相互作用、弹性性质和纳米结构:解决细菌膜不对称之谜","authors":"Xueying Guo, Wuge H. Briscoe","doi":"10.1016/j.cocis.2023.101731","DOIUrl":null,"url":null,"abstract":"<div><p>The membrane of Gram-negative bacteria (GNB) is especially robust due to the additional, unique, highly asymmetric outer membrane, with lipopolysaccharides (LPSs) as the main component. This LPS layer serves as a protective barrier against antibiotics, host immune responses, and other environmental stresses. However, constructing model membranes containing LPS that capture the structural asymmetry for fundamental studies of the GNB cell wall remains an open challenge. In this context, we discuss how recent physicochemical studies of Langmuir monolayers incorporating LPS help us better understand the elastic properties and structural integrity of model LPS bacterial membranes. The classic Langmuir–Blodgett trough has been used to reveal different lipid phase behaviors of monolayers containing LPS mutants with different molecular architectures to mimic the outer leaflet of the GNB outer membrane, shedding light on the underpinning molecular interactions. Permeation and penetration of antimicrobial peptides are shown to alter the viscoelastic properties of LPS monolayers. The LPS-containing Langmuir monolayer can also be transferred to a substrate as the outer leaflet of an asymmetric solid-supported bilayer, and we will discuss the limitations and potential optimization of this method. Finally, we highlight how different physicochemical methods can corroborate and contribute to unravelling the structural characteristics of model bacterial membranes.</p></div>","PeriodicalId":293,"journal":{"name":"Current Opinion in Colloid & Interface Science","volume":null,"pages":null},"PeriodicalIF":7.9000,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1359029423000560/pdfft?md5=d971da95ccef293402e28fd1d314cb7a&pid=1-s2.0-S1359029423000560-main.pdf","citationCount":"0","resultStr":"{\"title\":\"Molecular interactions, elastic properties, and nanostructure of Langmuir bacterial-lipid monolayers: Towards solving the mystery in bacterial membrane asymmetry\",\"authors\":\"Xueying Guo, Wuge H. Briscoe\",\"doi\":\"10.1016/j.cocis.2023.101731\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>The membrane of Gram-negative bacteria (GNB) is especially robust due to the additional, unique, highly asymmetric outer membrane, with lipopolysaccharides (LPSs) as the main component. This LPS layer serves as a protective barrier against antibiotics, host immune responses, and other environmental stresses. However, constructing model membranes containing LPS that capture the structural asymmetry for fundamental studies of the GNB cell wall remains an open challenge. In this context, we discuss how recent physicochemical studies of Langmuir monolayers incorporating LPS help us better understand the elastic properties and structural integrity of model LPS bacterial membranes. The classic Langmuir–Blodgett trough has been used to reveal different lipid phase behaviors of monolayers containing LPS mutants with different molecular architectures to mimic the outer leaflet of the GNB outer membrane, shedding light on the underpinning molecular interactions. Permeation and penetration of antimicrobial peptides are shown to alter the viscoelastic properties of LPS monolayers. The LPS-containing Langmuir monolayer can also be transferred to a substrate as the outer leaflet of an asymmetric solid-supported bilayer, and we will discuss the limitations and potential optimization of this method. Finally, we highlight how different physicochemical methods can corroborate and contribute to unravelling the structural characteristics of model bacterial membranes.</p></div>\",\"PeriodicalId\":293,\"journal\":{\"name\":\"Current Opinion in Colloid & Interface Science\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":7.9000,\"publicationDate\":\"2023-10-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://www.sciencedirect.com/science/article/pii/S1359029423000560/pdfft?md5=d971da95ccef293402e28fd1d314cb7a&pid=1-s2.0-S1359029423000560-main.pdf\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Current Opinion in Colloid & Interface Science\",\"FirstCategoryId\":\"92\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S1359029423000560\",\"RegionNum\":2,\"RegionCategory\":\"化学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"CHEMISTRY, PHYSICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Current Opinion in Colloid & Interface Science","FirstCategoryId":"92","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1359029423000560","RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
Molecular interactions, elastic properties, and nanostructure of Langmuir bacterial-lipid monolayers: Towards solving the mystery in bacterial membrane asymmetry
The membrane of Gram-negative bacteria (GNB) is especially robust due to the additional, unique, highly asymmetric outer membrane, with lipopolysaccharides (LPSs) as the main component. This LPS layer serves as a protective barrier against antibiotics, host immune responses, and other environmental stresses. However, constructing model membranes containing LPS that capture the structural asymmetry for fundamental studies of the GNB cell wall remains an open challenge. In this context, we discuss how recent physicochemical studies of Langmuir monolayers incorporating LPS help us better understand the elastic properties and structural integrity of model LPS bacterial membranes. The classic Langmuir–Blodgett trough has been used to reveal different lipid phase behaviors of monolayers containing LPS mutants with different molecular architectures to mimic the outer leaflet of the GNB outer membrane, shedding light on the underpinning molecular interactions. Permeation and penetration of antimicrobial peptides are shown to alter the viscoelastic properties of LPS monolayers. The LPS-containing Langmuir monolayer can also be transferred to a substrate as the outer leaflet of an asymmetric solid-supported bilayer, and we will discuss the limitations and potential optimization of this method. Finally, we highlight how different physicochemical methods can corroborate and contribute to unravelling the structural characteristics of model bacterial membranes.
期刊介绍:
Current Opinion in Colloid and Interface Science (COCIS) is an international journal that focuses on the molecular and nanoscopic aspects of colloidal systems and interfaces in various scientific and technological fields. These include materials science, biologically-relevant systems, energy and environmental technologies, and industrial applications.
Unlike primary journals, COCIS primarily serves as a guide for researchers, helping them navigate through the vast landscape of recently published literature. It critically analyzes the state of the art, identifies bottlenecks and unsolved issues, and proposes future developments.
Moreover, COCIS emphasizes certain areas and papers that are considered particularly interesting and significant by the Editors and Section Editors. Its goal is to provide valuable insights and updates to the research community in these specialized areas.