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Interactions of biologically active molecules, cofactors, and drugs with model membranes

dc.contributor.authorVan Cleave, Cameron, author
dc.contributor.authorCrans, Debbie C., advisor
dc.contributor.authorVan Orden, Alan K., committee member
dc.contributor.authorLevinger, Nancy E., committee member
dc.contributor.authorRoess, Deborah A., committee member
dc.description.abstractThe cell membrane is important for the structure, function, and overall homeostasis of the cell. It consists mainly of phospholipids which have different physicochemical and material properties. As such, molecular interactions between the membrane's components and its environment are of importance. This manuscript explores the interactions of different classes of molecules with model membrane systems to gain a fundamental understanding. Chapter 1 provides background on the cell membrane and current models as well as an introduction to lipoquinones and small molecule drugs. Chapter 2 discusses the interactions of menadione and menadiol with Langmuir monolayers and reverse micelles. Menadiol and menadione are representative of the headgroup of menaquinones, a class of electron transporter, hence they are redox active. We hypothesized that the respective locations of menadione and menadiol within the membrane would vary due to their different physicochemical properties. We used Langmuir monolayers and NMR of reverse micelles to explore the location and association of menadione and menadiol with model membrane interfaces. Chapter 3 investigates the location, association, and conformation of truncated menaquinones with Langmuir monolayers and simulated bilayers. Previous work found that truncated menaquinones fold at the interface of a reverse micelle, so we hypothesized that subtle differences in folding would cause variations in location and association with phospholipids. We used a combination of Langmuir monolayers and molecular dynamics simulations to probe location, association, and conformation of truncated menaquinone homologues, MK-1 through MK-4, in a phospholipid membrane. Chapter 4 explores the pH-dependent effects of two anti-tubercule molecules at the membrane interface. Recent studies have suggested that pyrazinoic acid behaves as a protonophore and we further explored this suggestion while simultaneously exploring physicochemical properties of pyrazinoic acid and pyrazinamide. This chapter utilized a combination of Langmuir monolayers, NMR, and fluorescence leakage studies to characterize the molecular interactions of pyrazinoic acid with model membranes so that POA could be compared to a previous study with benzoic acid, a known protonophore.
dc.format.mediumborn digital
dc.format.mediumdoctoral dissertations
dc.publisherColorado State University. Libraries
dc.rightsCopyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see
dc.subjectcell membrane
dc.titleInteractions of biologically active molecules, cofactors, and drugs with model membranes
dcterms.rights.dplaThis Item is protected by copyright and/or related rights ( You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s). State University of Philosophy (Ph.D.)


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