Graduation Year
2016
Document Type
Thesis
Degree
M.S.
Degree Name
Master of Science (M.S.)
Degree Granting Department
Physics
Major Professor
Jianjun Pan, Ph.D.
Committee Member
Sagar Pandit, Ph.D.
Committee Member
W. Garrett Matthews, Ph.D.
Keywords
miscibility transition temperature, critical fluctuation, giant unilamellar vesicle, membrane budding, fluorescence mode
Abstract
Cellular membranes are important targets for many membrane-active peptides and drug compounds. Here we are interested in deciphering how lipid membranes are perturbed by several membrane-active molecules, including the transmembrane domain of the influenza M2 protein (M2TM), aggregates formed by a synthetic polyglutamine peptide, and three polyphenol compounds (i.e., tamoxifen, genistein, and verapamil). We employ phase-separated ternary lipid model membranes in the form of giant unilamellar vesicles (GUVs) to simulate raft-like structures that have been proposed to govern many important processes in plasma membranes (e.g., intracellular singling and trafficking). Specifically, we use fluorescent microscopy to interrogate how those membrane additives modulate the phase behavior of free-standing GUVs, as well as the miscibility transition temperature (Tm). We find that M2TM increases Tm and causes vesicle budding; polyglutamine aggregates disrupt lipid membranes; and the three polyphenol compounds exert disparate effects on GUV Tm.
Scholar Commons Citation
Ho, Chian Sing, "Inquiry of Lipid Membranes Interacting with Functional Peptides and Polyphenol Drug Molecules" (2016). USF Tampa Graduate Theses and Dissertations.
https://digitalcommons.usf.edu/etd/6255
