The substrate specificities and kinetic properties of proteinase A, an intracellular aspartic proteinase from the yeast Saccharomyces cerevisiae, were determined using a series of synthetic chromogenic peptides with the general structure P5-P4-P3-P2-Phe-(NO2)Phe-P2'-P3' [P5, P4, P3, P2, P2', P3' are various amino acids; (NO2)Phe is p-nitro-L-phenylalanine]. The nature of the residues occupying the NH2-terminal region of the substrate had a strong influence on the kinetic constants. Among those tested, Ala-Pro-Ala-Lys-Phe-(NO2)-Phe-Arg-Leu had the best kinetic constants (Km = 0.012 mM, kcat = 14.4 s-1, kcat/Km = 1,200 M-1.s-1). Compared with such aspartic proteinases as pepsin, cathepsin D, and renin, the substrate specificity of proteinase A was unique. Based on these results, a novel fluorescent substrate, MOCAc-Ala-Pro-Ala-Lys-Phe-Phe-Arg-Leu-Lys(Dnp)-NH2, was developed for the sensitive measurement of proteinase A.
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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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