Abstract
Members of the caspase family are essential executors of apoptosis. Caspase-2 has two messenger RNAs generated by alternative splicing, which encode caspase-2L and caspase-2S. Although caspase-2L induces apoptosis, caspase-2S also has the ability to antagonize cell death. Experiments in caspase-2-deficient mice showed that caspase-2 functions to delay cell death in some neuronal populations, suggesting that caspase-2S dominantly acts for cell survival in the brain. However, the mechanism of caspase-2S-mediated anti-apoptotic effect is still unclear. Here, we isolated a protein that interacts with caspase-2S, designated as Ich-1S (caspase-2S)-binding protein (ISBP), by yeast two-hybrid screening using full-length caspase-2S cDNA as a bait. ISBP is identical to the recently isolated calcium and integrin-binding protein, and a small molecule calcium-binding protein with two EF-hand motifs of its C-terminus. In vitro transcribed and translated ISBP interacts specifically with glutathione-S-transferase-fused caspase-2S. Moreover, the interaction between ISBP and caspase-2S was observed in cultured cells. Northern blot analysis indicated that ISBP may be a ubiquitous protein. Interestingly, ISBP can partially inhibit the processing of pro-caspase-2L induced by anti-Fas antibody-treated Jurkat cytosolic lysates. These results suggested that ISBP may be the mediator for the survival function of caspase-2S. Copyright (C) 2000 Federation of European Biochemical Societies.
Original language | English |
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Pages (from-to) | 360-364 |
Number of pages | 5 |
Journal | FEBS Letters |
Volume | 470 |
Issue number | 3 |
DOIs | |
Publication status | Published - Mar 31 2000 |
Externally published | Yes |
Keywords
- Apoptosis
- Caspase-2
- Caspase-2S
- Ich-1S-binding protein
ASJC Scopus subject areas
- Biophysics
- Structural Biology
- Biochemistry
- Molecular Biology
- Genetics
- Cell Biology