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Study of mechanism of signal transduction in case of two model heme-containing sensor proteins
Mihalčin, Peter
;
Martínková, Markéta
(advisor) ;
Kavan, Daniel
(referee)
Heme-based gas sensing proteins belong to a group of proteins that are present in signalling pathways of bacteria. A precise regulation of physiological functions, such as intercellular communication or biofilm production, is essential for the survival of these bacteria and their adaptation to the changing surrounding conditions. Heme-based gas sensors are able to detect the concentration of gas molecules in the local environment via their sensory domain (which contains a heme molecule as the intrinsic detection site) and transmit the signal to the functional domain helping to regulate the adaptation of many processes. These, often pathogenic, processes contribute to extended resistance of bacteria against antibiotics. Heme-based sensors are thus potentially a new therapeutic object of interest in antimicrobial treatment. In order to provide this type of treatment, it is crucial to understand the exact mechanism of intramolecular signal transduction facilitated by heme-based sensors. One of the approaches to unravel these mechanisms is further study of model sensory proteins. This thesis focuses on the analysis of a signal transduction performed by two model globin-coupled heme-based oxygen sensors.
Detailed record
Preparation of a plasmid, its expression and preliminary isolation of MafK protein - the interacting partner of heme sensor Bach1
Mihalčin, Peter
;
Martínková, Markéta
(advisor) ;
Stráňava, Martin
(referee)
Bakalárska práca Abstract Heme-sensing proteins are heme proteins to which heme serves as a signalling molecule. Association or dissociation of heme moiety and heme-sensing proteins influences various physiological functions, such as enzyme activity or gene expression regulated by these heme-sensing proteins. The main object of this thesis is heme-sensing protein Bach1 and its interaction partner, transcription factor MafK. Bach1 refers to the group of transcription factors involved in repression of gene expression. The target genes of Bach1 regulation are hemeoxygenase genes. Hemeoxygenase controls the excess free heme degradation. Due to the excess of free heme in the cell, Bach1-heme interaction inactivates Bach1 controlled repression of hemeoxygenase resulting in the free heme degradation. In the state of physiological free heme concentration, Bach1-heme interaction does not occur and activated Bach1 represses the hemeoxygenase expression via binding to the target gene enhancers. Bach1 is incapable of making efficient Bach1-DNA bonding by itself, therefore the transcription factor MafK is essential. Protein MafK modulates the Bach1-DNA binding by making the heterodimer formation Bach1-MafK, which binds to DNA. The first aim of this thesis is to summarize the recent knowledge about transcriptional...
Detailed record
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