An apoptotic inducer, aralin, is a novel type II ribosome-inactivating protein from Aralia elata
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Makoto Tomatsu
Abstract
We recently found that aralin, a novel cytotoxic protein consisting of two subunits, from Aralia elata selectively induces apoptosis in transformed cells as compared to normal cells. Here we report that aralin is a lectin specific for galactose (Gal) and its derivatives, and possesses RNA N-glycosidase activity as a new type II ribosome-inactivating protein (RIP). The RNA N-glycosidase activity of aralin was detected in cell-free and whole cell systems by the generation of an R-fragment from 28S rRNA. Coinciding with appearance of the R-fragment in aralin-treated cells, significant inhibition of protein synthesis was observed prior to the onset of apoptosis. Aralin-evoked cell death was efficiently repressed by the addition of Gal and its derivatives. Interestingly, melibiose preferentially protected normal cells from apoptosis as compared with transformed cells. Using rhodamine-coupled aralin, the aralin receptor could be clearly detected around the cell surface of transformed cells, but to a lesser extent on normal cells. Receptor binding was suppressed by Gal. These results indicate that aralin is incorporated into cells via its Gal-containing cell surface receptor and induces apoptosis through its RIP activity. Moreover, the expression level and/or structural changes of the aralin receptor may affect the sensitivity toward aralin.
References
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Articles in the same Issue
- Tapasin and other chaperones: models of the MHC class I loading complex
- Expression analysis of BCL2L12, a new member of apoptosis-related genes, in colon cancer
- SR-A1, a member of the human pre-mRNA splicing factor family, and its expression in colon cancer progression
- RNA interference by small hairpin RNAs synthesised under control of the human 7S K RNA promoter
- Kinetic characterization of phenol and aniline derivates as substrates of peroxidase
- Non-muscle α-actinin-4 interacts with plasminogen activator inhibitor type-1 (PAI-1)
- Oxidative modification of low-density lipoprotein: lipid peroxidation by myeloperoxidase in the presence of nitrite
- An apoptotic inducer, aralin, is a novel type II ribosome-inactivating protein from Aralia elata
- Inhibition of inducible TNF-α expression by oxaspirodion, a novel spiro-compound from the ascomycete Chaetomium subspirale
- Inhibition of sequestration of human B2 bradykinin receptor by phenylarsine oxide or sucrose allows determination of a receptor affinity shift and ligand dissociation in intact cells
- Effects of short-term chemical ablation of the GIP receptor on insulin secretion, islet morphology and glucose homeostasis in mice
- Comprehensive analysis of metabolites in Corynebacterium glutamicum by gas chromatography/mass spectrometry