The glycoenzyme carboxypeptidase Y (peptidyl--amino-acid hydrolase, EC 3.4.16.1), from baker's yeast (British Fermentation Products Strain, Ng 72), of molecular weight 60 000, had a protein portion closely similar to those in the literature for carboxypeptidase Y isolations from other yeast sources, but was 25.3 wt% carbohydrate (mannose 83.3% by wt., glucosamine 10.3% by wt. with traces of galactose and galactosamine). Circular dichroic spectra indicated that the enzyme lost its beta-structure as the pH was lowered from 8.08 to 4.16. At p2H 8.22 in 2H2O media the conformation of this enzyme was different from that observed at pH 8.08. A tyrosine residue appeared to be perturbed by lowering the pH of the medium. Carboxypeptidase Y was rapidly, and essentially irreversibly, inactivated at low p2H. The pH profile of kcat for the carboxypeptidase Y-catalysed hydrolysis of 4-nitrophenyltrimethylacetate showed two inflections at 45 degrees C: one at pKapp approximately 3.7 insensitive to temperature variation (ascribed to a carboxyl group), and one of pKapp approximately 5.7 markedly temperature-dependent and possibly caused by a histidine residue.
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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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