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Tracking membrane permeabilization on single lipid vesicles - method development.
Gücklhorn, David
;
Šachl, Radek
(advisor) ;
Heřman, Petr
(referee)
Protein complexes are challenging systems to study, especially when these complexes form on lipid membranes only for a short period of time. This is also the case of fibroblast growth factor 2 (FGF2), a protein that has many physiological and pathological functions in the human organism. It plays major role in the development of cancer as it promotes cell survival and angiogenesis. It also serves as a basis for development of novel treatments of nerve injuries. Despite being heavily studied for many years, it remains unclear how the protein is translocated into the extracellular space where it performs its function. To study complex systems such as FGF2 that self-assembles on the membrane into membrane penetrating pores we decided to develop a simple and efficient fluorescent microscopy method. This method is called double leakage single GUV assay (DLSGA). It utilizes giant unilamellar vesicles (GUVs) mimicking native cellular membranes. In a single experiment, up to 300 individual GUVs are imaged for the content of a leakage dye that reports on the presence of FGF2 pores. During three measurements and under different conditions, detailed information about pore-opening dynamics is gained for each GUV. Results of these measurements are then used to divide GUVs into six groups based on formation and...
Detailed record
Modeling of an influence of a phospholipid membrane composition on the structure and dynamics of cytochromes P450s.
Gücklhorn, David
;
Jeřábek, Petr
(advisor) ;
Kulhánek, Petr
(referee)
Cytochrome P450 1A2 is one the most important enzymes that take part in phase I of biotransformation of xenobiotics in human body. This enzyme is anchored in membrane via transmembrane α-helix. Composition of the phospholipid membrane can affect structure and dynamics of this enzyme. In this thesis optimized full-length all-atom model of cytochrome P450 1A2 in POPC (1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine) membrane was created based on crystal structure of catalytic domain of this enzyme. Methods of molecular dynamics were used for creation and optimization of the model which contained parts with unknown structure. The optimized model was subjected to thorough analysis of its structure and dynamics and compared to a similar model with DLPC (1,2-dilauroyl-sn-glycero-3- phosphocholine) membrane. The results show that the composition of the membrane significantly affects dynamics of transmembrane domain and its contact with catalytic domain. Usage of the thicker POPC membrane resulted in smaller contact between both domains which caused partial emergence of the catalytic domain from membrane. Penetration of palmitoyl chain of POPC into tunnel 2f was observed in one the trajectories. Analysis of pathways to active site of cytochrome P450 1A2 and the influence of the membrane composition on...
Detailed record
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