We have cloned the gene NPS1 (nuclear protein of Saccharomyces) which encodes a nuclear protein of mol. wt 156 735 Daltons (1359 amino acids) essential for cell growth. NPS1 contains a 2 kb sequence that is highly homologous to the S. cerevisiae SNF2/GAM1 gene known as a transcriptional regulator for multiple genes. However, the NPS1 gene was found to have a distinct function from SNF2/GAM1. The growth of the cells carrying a nps1 delta :: URA3 deletion allele and galactose-inducible NPS1 on a plasmid was arrested under NPS1-repressed conditions with a cell cycle arrest phenotype, being arrested at the large-bud stage with a single nucleus that had a DNA content of G2/M phase. When the arrested cells were further incubated under NPS1-repressed conditions, re-replication of DNA occurred in some of the arrested cells without passage through mitosis. In the predicted amino acid sequence of NPS1, sequences homologous to the catalytic domain of protein kinases were found. We constructed a mutation which results in the substitution of a highly conserved lysine residue (Lys792) in the presumed ATP-binding site of this kinase-like domain with a glutamic acid codon. The mutant gene failed to rescue the growth defect caused by NPS1 disruption, suggesting that Lys792 is essential for the function of NPS1.
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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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