Protein Prp22 is a DEAH box RNA helicase, which plays two distinct roles in pre-mRNA splicing: it participates in second transesterification step (ATP independent function) and it releases mature mRNA from the spliceosome (ATP dependent function). Prp45p, yeast ortholog of the human transcription co-regulator SNW/SKIP, is an essential splicing factor, it is included in spliceosome throughout the splicing reaction. Mutant prp45(1-169) genetically interacts with some alleles of NTC complex and second step splicing factors, one of them is also gene PRP22. Here we present, that mutants prp22(-158T) and prp22(-327A), which are synthetically lethal with prp45(1-169), express lower amount of Prp22p due to the mutation in upstream regulation region. Mutants prp22(-158T), prp22(300PPI) and prp22(-327A) affect splicing of pre-mRNA with mutation in 5'ss with respect to sequence of the second exon. N-terminal mutants prp22(∆301) and prp22(∆350) are synthetically lethal with prp45(1-169). Synthetic lethality is possibly caused by lower efficiency of Prp22 recruitment to the spliceosomes, which is no more viable for cells.
| Identifer | oai:union.ndltd.org:nusl.cz/oai:invenio.nusl.cz:296547 |
| Date | January 2010 |
| Creators | Senohrábková, Lenka |
| Contributors | Půta, František, Malcová, Ivana |
| Source Sets | Czech ETDs |
| Language | Czech |
| Detected Language | English |
| Type | info:eu-repo/semantics/masterThesis |
| Rights | info:eu-repo/semantics/restrictedAccess |
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