The division cycle of yeast a cells is inhibited by alpha-factor. Haploid a cells were found to bind 35S-labeled alpha-factor, whereas haploid alpha cells and diploid a/alpha cells showed little binding. The association of alpha-factor with a cells was reversible upon dilution. Unlabeled alpha-factor competed for binding of 35S-alpha-factor; the concentration dependence for competition indicated 9 X 10(5) binding sites per cell with a dissociation constant (KD) of 3 X 10(-7) M. The rates of association (kon = 3 X 10(3) M-1 sec-1) and dissociation (koff = 9 X 10(-4) sec-1) were consistent with the equilibrium constant. The alpha-factor binding activity associated with five temperature-sensitive ste2 mutants was thermolabile, suggesting that the STE2 gene encodes the receptor for alpha-factor. In contrast, the binding activity of other temperature-sensitive mutants (ste4, ste5, ste7, ste11, and ste12) showed no thermolability.
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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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