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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
NMR study of the extracellular part of the mouse Nkr-p1b receptor from natural killer cells
 Skála, Kristián ; Chmelík, Josef (advisor) ; Martínek, Václav (referee)
Protein Nkr-p1b is a surface receptor of cytotoxic NK cells, that mediates inhibitory signal toward the body's own cells. In this study, the ligand binding domain of the mouse protein receptor Nkr-p1b (mNkr-p1b LBD) was prepared by recombinant expression in E. coli cells. Isolated protein was subsequently used for NMR structural analysis. Prediction of protein secondary structures ratio was carried out using three different methods (CD, PSIPRED and TALOS). Results correlate well with the structure of CTLD domain, that plays a key role in ligand binding and thus to function of Nkr-p1b receptor. We managed to prepare this protein in a form suitable for NMR experiments. Based on the data obtained by NMR spectra analysis, a preliminary model of the mNkr-p1b LBD protein structure was created. However, for more precise learning of the 3D structure accurate positions of individual atoms need to be determined by other NMR spectra evaluation in the next phase. Explaining the structure of the ligand binding domain of mNkr-p1b protein could help to better understand the complex mechanism of activation of NK cell cytotoxic activity, thereby contributing to its controlled use as a therapeutic against some viral and tumor diseases.
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Preparation of the soluble form of a mouse NKR-P1A protein for the NMR study
 Skála, Kristián ; Chmelík, Josef (advisor) ; Adámková, Lyubina (referee)
Natural killer cells (NK cells) are a type of lymphocyte. According to their function they are defined as cytotoxic cells which cause cell death without prior sensitization. NKR-P1 is one of the families of NK surface receptors. This family belong to C-type lectin like with inhibitory or activatory function. In this work we concern of soluble form of mouse protein Nkr-p1a, that is isoform of activatory receptor Nkr-p1a. This receptor is expected to be intracellular due to lack of major part of its transmembrane domain. We focus on the optimization of Nkr-p1a production parameters. As production system we used bacterial strain E. coli BL21(DE3) Gold, in which the target protein is produced and subsequently isolated in the form of inclusion bodies. Obtained recombinant protein was refolded and purified. As purification step we used high-performance liquid chromatography. We optimized concentration of inductor of expression, production time and temperature. The objective is to set up protocol for preparation of isotopically labeled protein for nuclear magnetic resonance structure characterization. (in czech)
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4 Skala, Kateřina
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