Various signal motifs that are required for efficient pre-mRNA 3'-end formation in the yeast Saccharomyces cerevisiae have been reported. None of these known signal sequences appears to be of the same general importance as is the mammalian AAUAAA motif. To establish the importance of yeast pre-mRNA termini in 3'-end formation, the ends of a pre-mRNA transcript synthesized in vitro were ligated before incubation in a yeast whole-cell extract. Such covalently closed circular RNAs were not cleaved at their poly(A) sites. Interestingly, pseudocircular RNAs with complementary 3'- and 5'-terminal sequences allowing the formation of panhandle structures were also resistant to cleavage. However, 3'-end processing was impeded neither by terminal hairpins at either or at both ends nor by RNA oligonucleotides complementary to either or both ends of a linear pre-mRNA. Intriguingly mammalian pseudocircular pre-mRNAs also were not cleaved at their poly(A) sites when incubated in a HeLa cell nuclear extract. These results provide evidence for the general importance of RNA topology in the formation of an active 3'-end processing complex in S. cerevisiae and higher eukaryotes. The possibility of a torus-shaped factor involved in 3'-end formation is discussed.
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Evidence ID | Analyze ID | Gene/Complex | Systematic Name/Complex Accession | Qualifier | Gene Ontology Term ID | Gene Ontology Term | Aspect | Annotation Extension | Evidence | Method | Source | Assigned On | Reference |
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Evidence ID | Analyze ID | Gene | Gene Systematic Name | Phenotype | Experiment Type | Experiment Type Category | Mutant Information | Strain Background | Chemical | Details | Reference |
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Evidence ID | Analyze ID | Gene | Gene Systematic Name | Disease Ontology Term | Disease Ontology Term ID | Qualifier | Evidence | Method | Source | Assigned On | Reference |
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Evidence ID | Analyze ID | Regulator | Regulator Systematic Name | Target | Target Systematic Name | Direction | Regulation of | Happens During | Regulator Type | Direction | Regulation Of | Happens During | Method | Evidence | Strain Background | Reference |
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Site | Modification | Modifier | Source | Reference |
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Evidence ID | Analyze ID | Interactor | Interactor Systematic Name | Interactor | Interactor Systematic Name | Allele | Assay | Annotation | Action | Phenotype | SGA score | P-value | Source | Reference | Note |
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Evidence ID | Analyze ID | Interactor | Interactor Systematic Name | Interactor | Interactor Systematic Name | Assay | Annotation | Action | Modification | Source | Reference | Note |
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Complement ID | Locus ID | Gene | Species | Gene ID | Strain background | Direction | Details | Source | Reference |
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Evidence ID | Analyze ID | Dataset | Description | Keywords | Number of Conditions | Reference |
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