Cytoplasmic aspartyl-tRNA synthetase from Saccharomyces cerevisiae is a dimer made up of identical subunits of Mr 64,000 as shown by biochemical and crystallographic analyses. Previous studies have emphasized the high sensitivity of the amino-terminal region (residues 1-32) to proteolytic enzymes. This work reports the results of limited tryptic or chymotryptic digestion of the purified enzyme which gives rise to a truncated species that has lost the first 50-64 residues with full retention of both the activity and the dimeric structure. In contrast the larger tryptic fragment is distinguished from the whole enzyme by its weaker retention on heparin-substituted agarose gels. The cleaved N-terminal part presents peculiar structural features, such as a high content in lysine residues arranged in a palindromic fashion. The properties of the trypsin-modified enzyme and of the cleaved amino-terminal region are discussed in relation to the known structural characteristics of aspartyl-tRNA synthetase and of other eukaryotic aminoacyl-tRNA synthetases.
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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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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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