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The role of cyclophilins in splicing
Cit, Zdeněk ; Půta, František (advisor) ; Novotný, Ivan (referee)
Splicing is a process essential for the proper functioning of eukaryotic cells. It is a complicated and highly dynamic process, participated by large numbers of proteins which perform diverse functions, either directly within the splicing complex, or sometimes outside of it. Among the proteins, which play an important role in splicing, are cyclophilins. Cyclophilins probably cause conformational changes in the other components of splicing complex. They can also maintain them in the desire conformation thereby they contribute to the dynamics of the spliceosome. This work provides an overview of cyclophilins, which were confirmed to participate on pre-mRNA splicing, and summarizes suggestions of possible functions that these proteins may perform.
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Splicing of atypical introns in S. cerevisiae
Cit, Zdeněk ; Půta, František (advisor) ; Pichová, Alena (referee)
Pre-mRNA splicing is a vital process of gene expression important for all eukaryotic organisms. For the proper function of this very complex and dynamic event the presence of few specialized RNA and many proteins that hold a variety of tasks is necessary, not only inside the splicing complex itself, but also beyond this complex. The Prp45 is one of the proteins involved in pre-mRNA splicing in yeast Saccharomyces cerevisiae. Its human homologue, SNW1/SKIP, is involved in splicing but also in other crucial cell processes. The Prp45 protein was reliably reported only to participate in the second transesterification reaction of splicing. But there are also data suggesting its possible involvement in the first transesterification reaction. This work provides further evidences linking protein Prp45 with the first splicing reaction, obtained by the research of cells carrying the mutant allele prp45(1-169). Cells carrying this allele show dropped splicing and accumulation of pre-mRNAs. This thesis therefore also investigated the possible influence of Prp45 protein on the RNA export from the nucleus to the cytoplasm. But no connection between this protein and RNA transport was discovered. Keywords pre-mRNA splicing; Saccharomyces cerevisiae; Prp45; Mer1; Mud2; Prp22; Rrp6; AMA1; SNW1/SKIP
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The role of cyclophilins in splicing
Cit, Zdeněk ; Půta, František (advisor) ; Novotný, Ivan (referee)
Splicing is a process essential for the proper functioning of eukaryotic cells. It is a complicated and highly dynamic process, participated by large numbers of proteins which perform diverse functions, either directly within the splicing complex, or sometimes outside of it. Among the proteins, which play an important role in splicing, are cyclophilins. Cyclophilins probably cause conformational changes in the other components of splicing complex. They can also maintain them in the desire conformation thereby they contribute to the dynamics of the spliceosome. This work provides an overview of cyclophilins, which were confirmed to participate on pre-mRNA splicing, and summarizes suggestions of possible functions that these proteins may perform.
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