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Structure Determination of Hiv-1 Tat/Fluid Phase Membranes and Dmpc Ripple Phase Using X-Ray Scattering

Structure Determination of Hiv-1 Tat/Fluid Phase Membranes and Dmpc Ripple Phase Using X-Ray Scattering

Hardcover

Series: Springer Theses

BiologyPhysics

ISBN10: 3319222090
ISBN13: 9783319222097
Publisher: Springer Nature
Published: Oct 30 2015
Pages: 168
Weight: 0.98
Height: 0.50 Width: 6.14 Depth: 9.21
Language: English

This Thesis in biological physics has two components, describing the use of X-ray scattering techniques to study the structure of two different stacked lipid membrane systems.

The first part focuses on the interaction between a short 11-mer peptide, Tat, which is part of the Tat protein in the HIV-1 virus. Although highly positively charged, the Tat protein has been shown to translocate through hydrocarbon lipid bilayers easily, without requiring the cell's energy, which is counter to its Born self-energy. In this work Tat's location in the headgroup region was demonstrated using a combined X-ray scattering and molecular dynamics approach. Bilayer thinning was observed as well as softening of different membrane mimics due to Tat. It was concluded that Tat's headgroup location, which increases the area/lipid, and its bilayer softening likely reduce the energy barrier for passive translocation.

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