Identification of a new caspase homologue: caspase-14 - PubMed (original) (raw)
Identification of a new caspase homologue: caspase-14
M Van de Craen et al. Cell Death Differ. 1998 Oct.
Abstract
Caspases are cysteinyl aspartate-specific proteinases, many of which play a central role in apoptosis. Here, we report the identification of a new murine caspase homologue, viz. caspase-14. It is most related to human/murine caspase-2 and human caspase-9, possesses all the typical amino acid residues of the caspases involved in catalysis, including the QACRG box, and contains no or only a very short prodomain. Murine caspase-14 shows 83% similarity to human caspase-14. Human caspase-14 is assigned to chromosome 19p13.1. Northern blot analysis revealed that mRNA expression of caspase-14 is undetectable in all mouse adult tissues examined except for skin, while it is abundantly expressed in mouse embryos. In contrast to many other caspase family members, murine caspase-14 is not cleaved by granzyme B, caspase-1, caspase-2, caspase-3, caspase-6, caspase-7 or caspase-11, but is weakly processed into p18 and p11 subunits by murine caspase-8. No aspartase activity of murine caspase-14 could be generated by bacterial or yeast expression. Transient overexpression of murine caspase-14 in mammalian cells did not elicit cell death and did not interfere with caspase-8-induced apoptosis. In conclusion, caspase-14 is a member of the caspase family but no proteolytic or biological activities have been identified so far. The high constitutive expression levels in embryos and specific expression in adult skin suggest a role in ontogenesis and skin physiology.
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