Document Detail

YND1 interacts with CDC55 and is a novel mediator of E4orf4-induced toxicity.
MedLine Citation:
PMID:  16227198     Owner:  NLM     Status:  MEDLINE    
Adenovirus E4orf4 (early region 4 open reading frame 4) protein induces protein phosphatase 2A-dependent non-classical apoptosis in mammalian cells and irreversible growth arrest in Saccharomyces cerevisiae. Oncogenic transformation sensitizes cells to E4orf4-induced cell death. To uncover additional components of the E4orf4 network required for induction of its unique mode of apoptosis, we used yeast genetics to select gene deletions conferring resistance to E4orf4. Deletion of YND1, encoding a yeast Golgi apyrase, conferred partial resistance to E4orf4. However, Ynd1p apyrase activity was not required for E4orf4-induced toxicity. Ynd1p and Cdc55p, the yeast protein phosphatase 2A-B subunit, contributed additively to E4orf4-induced toxicity. Furthermore, concomitant overexpression of one and deletion of the other was detrimental to yeast growth, demonstrating a functional interaction between the two proteins. YND1 and CDC55 also interacted genetically with CDC20 and CDH1/HCT1, encoding activating subunits of the anaphase-promoting complex/cyclosome. In addition to their functional interaction, Ynd1p and Cdc55p interacted physically, and this interaction was disrupted by E4orf4, which remained associated with both proteins. The results suggested that Ynd1p and Cdc55p share a common downstream target whose balanced modulation by the two E4orf4 partners is crucial to viability. Disruption of this balance by E4orf4 may lead to cell death. NTPDase-4/Lalp70/UDPase, the closest mammalian homologue of Ynd1p, associated with E4orf4 in mammalian cells, suggesting that the results in yeast are relevant to the mammalian system.
Tsofnat Maoz; Roni Koren; Inbal Ben-Ari; Tamar Kleinberger
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2005-10-14
Journal Detail:
Title:  The Journal of biological chemistry     Volume:  280     ISSN:  0021-9258     ISO Abbreviation:  J. Biol. Chem.     Publication Date:  2005 Dec 
Date Detail:
Created Date:  2005-12-12     Completed Date:  2006-02-07     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  2985121R     Medline TA:  J Biol Chem     Country:  United States    
Other Details:
Languages:  eng     Pagination:  41270-7     Citation Subset:  IM    
The Gonda Center of Molecular Microbiology and The Rappaport Family Institute for Research in the Medical Sciences, Faculty of Medicine, Technion-Israel Institute of Technology, Bat Galim, Haifa, 31096, Israel.
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MeSH Terms
Adenovirus E4 Proteins
Apyrase / metabolism*
Cell Cycle Proteins / metabolism*
Cell Death
Cell Line
Cell Transformation, Neoplastic
DNA Transposable Elements
Gene Deletion
Gene Expression Regulation, Fungal
Genetic Vectors
Golgi Apparatus / metabolism
Image Processing, Computer-Assisted
Mitotic Spindle Apparatus
Open Reading Frames
Plasmids / metabolism
Protein Binding
Protein Phosphatase 2
Saccharomyces cerevisiae / metabolism
Saccharomyces cerevisiae Proteins / metabolism*
Signal Transduction
Viral Proteins / genetics*,  metabolism*
Reg. No./Substance:
0/Adenovirus E4 Proteins; 0/CDC20 protein, S cerevisiae; 0/CDC55 protein, S cerevisiae; 0/Cell Cycle Proteins; 0/DNA Transposable Elements; 0/E4orf4 protein, adenovirus; 0/Saccharomyces cerevisiae Proteins; 0/Viral Proteins; EC Phosphatase 2; EC; EC protein, S cerevisiae

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