Human PDCD5 protein is a novel programmed cell death-promoting molecule. However, the function of Ymr074cP, a S. cerevisiae homologue of hPDCD5, is still unknown. Heteronuclear NMR methods were used to determine the solution structure of the N-terminal 116-residue fragment (N116) of Ymr074cP protein. N116 is shown to be a heterogeneous ensemble of flexibly folded conformations, adopting an extended triple-helix bundle fold that is connected to a mobile but structured alpha-helix in the N-terminus by means of a lengthy highly flexible linker. By the nitroxide spin label, attached to the mutant cysteine residue at position 7 or 11, significant transient interactions were probed between the N-terminal helical portion and the core moiety plus several residues in the C-terminal tail. The topology of the triple-helix bundle is encoded mainly by hydrophobic interactions, and the N-terminal helical structure has a unique electrostatic potential character. A comparison of the solution structures of PDCD5-related proteins indicates that the structure of the triple-helix bundle is significantly conserved during evolution. We are the first to demonstrate that YMR074c overexpression promotes H(2)O(2)-induced apoptosis in yeast, not only in a metacaspase Yca1-dependent manner but also in a Yca1-independent manner and that deletion of the N-terminal helical portion greatly attenuates the apoptosis-promoting activity of this protein.
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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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Evidence ID | Analyze ID | File | Description |
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