In mammals, the 59-residue ribosomal protein S30 (rpS30) is synthesized as a fusion to a 74-residue ubiquitin-like protein, which is cleaved to yield mature rpS30. An artificial fusion of this ubiquitin-like protein to E. coli beta-galactosidase was not cleaved when expressed in yeast (Saccharomyces cerevisiae), indicating that yeast lack this cleaving activity. The yeast rpS30 homolog (yrpS30) was purified and sequenced to reveal a 63-residue protein with 61% sequence identity to mammalian rpS30. Degenerate oligonucleotides based on the yrpS30 sequence were used to isolate full-length yrpS30 cDNAs. Sequence analysis of five cDNA clones revealed that yrpS30 is not synthesized as a fusion to a ubiquitin-like protein but is extended at its N terminus by a single methionine residue. The corresponding gene was identified in the GenBankTM data base by sequence alignment and termed RPS30A. The gene consists of two exons separated by a 430-base pair intron, which contains consensus splicing elements. Exon 1 encodes the initiator methionine residue and is preceded by canonical yeast ribosomal protein gene promoter elements. Exon 2 encodes the 62-residue mature yrpS30. Genomic hybridization reveals that the RPS30A gene is duplicated. Disruption of the RPS30A gene is not lethal but confers a slow growth phenotype. Ribosomes in the mutant strains contain an authentic yrpS30 protein, indicating that a functional yrpS30 is expressed from the duplicated gene but that the reduced capacity for yrpS30 synthesis restricted the growth rate. Analysis of available DNA sequence data bases reveals that rpS30 is synthesized as a fusion to a ubiquitin-like protein in nematodes and mammals but unfused in yeast, plants, and protazoa.
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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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