Yeast glutamine synthetase can be irreversibly inactivated in the presence of L-methionine sulfoximine, ATP, and a divalent cation Mn2+ or Mg2+. Kinetic studies with partially inactivated enzymes show that inactivation of a given subunit in the octameric glutamine synthetase affects the activities of its neighboring subunit such that the rate of the inactivation as well as the gamma-glutamyltransferase activity of the noninactivated subunits decreases while their biosynthetic activity is enhanced. This outcome of subunit interaction is the same irrespective of whether Mn2+ or Mg2+ is used to fulfill the divalent cation requirement of glutamine synthetase for the inactivation reaction and the gamma-glutamyltransferase reaction. Although only Vmax is affected in the gamma-glutamyltransferase assay, both Km (glutamate) and Vmax are changed in the biosynthetic assay.
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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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