NatB Nalpha-terminal acetyltransferase of Saccharomyces cerevisiae acts cotranslationally on proteins with Met-Glu- or Met-Asp- termini and subclasses of proteins with Met-Asn- and Met-Met- termini. NatB is composed of the interacting Nat3p and Mdm20p subunits, both of which are required for acetyltransferase activity. The phenotypes of nat3-Delta and mdm20-Delta mutants are identical or nearly the same and include the following: diminished growth at elevated temperatures and on hyperosmotic and nonfermentable media; diminished mating; defective actin cables formation; abnormal mitochondrial and vacuolar inheritance; inhibition of growth by DNA-damaging agents such as methyl methanesulfonate, bleomycin, camptothecin, and hydroxyurea; and inhibition of growth by the antimitotic drugs benomyl and thiabendazole. The similarity of these phenotypes to the phenotypes of certain act1 and tpm1 mutants suggests that such multiple defects are caused by the lack of acetylation of actin and tropomyosins. However, the lack of acetylation of other unidentified proteins conceivably could cause the same phenotypes. Furthermore, unacetylated actin and certain N-terminally altered actins have comparable defective properties in vitro, particularly actin-activated ATPase activity and sliding velocity.
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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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