title: GRIM-19 associates with the serine protease HtrA2 for promoting cell death.
abstract: We have isolated a novel interferon (IFN)-retinoid regulated cell death regulatory protein genes associated with retinoid-IFN-induced mortality (GRIM)-19 earlier. To understand its mechanism of action, we have employed a yeast-two-hybrid screen and identified serine protease HtrA2 as its binding partner. GRIM-19 physically interacts with HtrA2 and augments cell death in an IFN/all-trans retinoic acid (RA)-dependent manner. In the presence of GRIM-19, the HtrA2-driven destruction of the antiapoptotic protein X-linked inhibitor of apoptosis (XIAP) is augmented. These interactions were disrupted by an human herpes virus-8 (HHV-8)-coded oncoprotein, vIRF1, and conferred resistance to IFN/RA-induced cell death. These data show a critical role of HtrA2 in a cytokine-induced cell death response for the first time and its inhibition by a viral protein.
authors.affiliation: Department of Microbiology and Immunology, Greenebaum Cancer Center, University of Maryland School of Medicine, Baltimore, MD 21201, USA.
authors.forename: X
authors.initials: X
authors.lastname: Ma
authors.forename: S
authors.initials: S
authors.lastname: Kalakonda
authors.forename: S M
authors.initials: SM
authors.lastname: Srinivasula
authors.forename: S P
authors.initials: SP
authors.lastname: Reddy
authors.forename: L C
authors.initials: LC
authors.lastname: Platanias
authors.forename: D V
authors.initials: DV
authors.lastname: Kalvakolanu
mesh_terms: D017209:Apoptosis / Q000187:drug effects / Q000235:genetics / Q000502:physiology*; D051017:Apoptosis Regulatory Proteins / Q000235:genetics / Q000378:metabolism*; D002460:Cell Line; D045744:Cell Line, Tumor; D002470:Cell Survival / Q000187:drug effects / Q000235:genetics / Q000502:physiology; D004351:Drug Resistance; D005822:Genetic Vectors / Q000235:genetics; D049452:Green Fluorescent Proteins / Q000235:genetics / Q000378:metabolism; D000074923:High-Temperature Requirement A Serine Peptidase 2; D006801:Humans; D050835:Interferon Regulatory Factors / Q000235:genetics / Q000378:metabolism; D016899:Interferon-beta / Q000494:pharmacology; D024101:Mitochondrial Proteins / Q000235:genetics / Q000378:metabolism*; D009247:NADH, NADPH Oxidoreductases / Q000235:genetics / Q000378:metabolism*; D011485:Protein Binding; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism; D012697:Serine Endopeptidases / Q000235:genetics / Q000378:metabolism*; D014162:Transfection; D014212:Tretinoin / Q000494:pharmacology; D020798:Two-Hybrid System Techniques; D014764:Viral Proteins / Q000235:genetics / Q000378:metabolism; D051636:X-Linked Inhibitor of Apoptosis Protein / Q000235:genetics / Q000378:metabolism
chemical_list: D051017:Apoptosis Regulatory Proteins; D050835:Interferon Regulatory Factors; D024101:Mitochondrial Proteins; D011993:Recombinant Fusion Proteins; D014764:Viral Proteins; D051636:X-Linked Inhibitor of Apoptosis Protein; C496866:XIAP protein, human; C413486:viral interferon regulatory factors; D049452:Green Fluorescent Proteins; D014212:Tretinoin; D016899:Interferon-beta; D009247:NADH, NADPH Oxidoreductases; C439057:NDUFA13 protein, human; D012697:Serine Endopeptidases; C000615914:HTRA2 protein, human; D000074923:High-Temperature Requirement A Serine Peptidase 2