Characterization of mouse mast cell protease-8, the first member of a novel subfamily of mouse mast cell serine proteases, distinct from both the classical chymases and tryptases

European Journal of Immunology
C LützelschwabL Hellman

Abstract

Using a recently developed PCR-based strategy, a cDNA encoding a novel mouse mast cell (MC) serine protease (MMCP-8) was isolated and characterized. The MMCP-8 mRNA contains an open reading frame of 247 amino acids (aa), divided into a signal sequence of 18 aa followed by a 2-aa activation peptide (Gly-Glu) and a mature protease of 227 aa. The mature protease has an M(r) of 25072, excluding post-translational modifications, a net positive charge of +12 and six potential N-glycosylation sites. MMCP-8 showed a high degree of homology with mouse granzyme B in the critical regions for determining substrate cleavage specificity, indicating that MMCP-8, similar to granzyme B, preferentially cleaves after Asp residues. A comparative analysis of the aa sequence of MMCP-8 with other hematopoietic serine proteases shows that it is more closely related to cathepsin G and T cell granzymes than to the MC chymases. We therefore conclude that MMCP-8 belongs to a novel subfamily of mouse MC proteases distinct from both the classical chymases and tryptases. Southern blot analysis of BALB/c genomic DNA indicated that only one MMCP-8 gene (or MMCP-8 like gene) is present in the mouse genome. Northern blot analysis of rodent hematopoietic cell lin...Continue Reading

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Citations

Jun 22, 2002·APMIS : Acta Pathologica, Microbiologica, Et Immunologica Scandinavica·Klas Norrby
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