title: Identification and characterization of DEDD2, a death effector domain-containing protein.
abstract: A novel Death Effector Domain-containing protein was identified, DEDD2, which is closest in amino acid sequence homology to death effector domain-containing DNA-binding protein, DEDD. DEDD2 mRNA is expressed widely in adult human tissues with highest levels in liver, kidney, and peripheral blood leukocytes. DEDD2 interacts with FLIP, but not with Fas-associated death domain (FADD) or caspase-8. Overexpression of DEDD2 induces moderate apoptosis and results in substantial sensitization to apoptosis induced by Fas (CD95/APO-1), tumor necrosis factor-related apoptosis-inducing ligand (TRAIL, Apo2L), or FADD. In contrast, Bax- or staurosporine-mediated cell death is not affected by expression of DEDD2. Fluorescence microscopy showed that overexpressed DEDD2 translocates to the nucleus, which is dependent on the presence of a bipartite nuclear localization signal in the DEDD2 protein. Mutagenesis studies revealed that the translocation of the DED of DEDD2 to the nucleus is essential for its pro-apoptotic activity. These findings suggest that DEDD2 is involved in the regulation of nuclear events mediated by the extrinsic apoptosis pathway.
authors.affiliation: The Burnham Institute, 10901 N Torrey Pines Road, La Jolla, CA 92037, USA.
authors.forename: Wilfried
authors.initials: W
authors.lastname: Roth
authors.forename: Frank
authors.initials: F
authors.lastname: Stenner-Liewen
authors.forename: Krzysztof
authors.initials: K
authors.lastname: Pawlowski
authors.forename: Adam
authors.initials: A
authors.lastname: Godzik
authors.forename: John C
authors.initials: JC
authors.lastname: Reed
mesh_terms: D021581:Active Transport, Cell Nucleus; D000595:Amino Acid Sequence; D000818:Animals; D017209:Apoptosis; D029681:Arabidopsis Proteins; D015152:Blotting, Northern; D053446:CASP8 and FADD-Like Apoptosis Regulating Protein; D019556:COS Cells; D002352:Carrier Proteins / Q000096:biosynthesis* / Q000737:chemistry* / Q000378:metabolism; D053181:Caspase 8; D053453:Caspase 9; D020169:Caspases / Q000378:metabolism; D002460:Cell Line; D002467:Cell Nucleus / Q000378:metabolism; D003001:Cloning, Molecular; D003600:Cytosol / Q000378:metabolism; D004247:DNA / Q000378:metabolism; D018076:DNA, Complementary / Q000378:metabolism; D004268:DNA-Binding Proteins / Q000737:chemistry*; D053418:Death Domain Receptor Signaling Adaptor Proteins; D020224:Expressed Sequence Tags; D044943:Fatty Acid Desaturases / Q000378:metabolism; D006801:Humans; D047908:Intracellular Signaling Peptides and Proteins; D008856:Microscopy, Fluorescence; D008969:Molecular Sequence Data; D009687:Nuclear Proteins / Q000096:biosynthesis* / Q000737:chemistry*; D010957:Plasmids / Q000378:metabolism; D011233:Precipitin Tests; D011485:Protein Binding; D011518:Proto-Oncogene Proteins / Q000378:metabolism; D019253:Proto-Oncogene Proteins c-bcl-2; D012333:RNA, Messenger / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D017386:Sequence Homology, Amino Acid; D013997:Time Factors; D014018:Tissue Distribution; D051028:bcl-2-Associated X Protein; D019014:fas Receptor / Q000378:metabolism
chemical_list: D029681:Arabidopsis Proteins; C494826:BAX protein, human; D053446:CASP8 and FADD-Like Apoptosis Regulating Protein; C506386:CFLAR protein, human; D002352:Carrier Proteins; C116096:DEDD protein, human; C450835:DEDD2 protein, human; D018076:DNA, Complementary; D004268:DNA-Binding Proteins; D053418:Death Domain Receptor Signaling Adaptor Proteins; D047908:Intracellular Signaling Peptides and Proteins; D009687:Nuclear Proteins; D011518:Proto-Oncogene Proteins; D019253:Proto-Oncogene Proteins c-bcl-2; D012333:RNA, Messenger; D051028:bcl-2-Associated X Protein; D019014:fas Receptor; D004247:DNA; D044943:Fatty Acid Desaturases; C084083:Fad7 protein, Arabidopsis; C505530:CASP8 protein, human; C506433:CASP9 protein, human; D053181:Caspase 8; D053453:Caspase 9; D020169:Caspases