Abstract
A 40-kDa lectin with N-acetyl-d-glucosamine-binding ability was purified from the sera of fugu (Takifugu rubripes) by affinity chromatography and subsequent gel filtration. N-terminal amino acid sequencing, in silico cloning using the fugu genome database and cDNA cloning demonstrated that this lectin is a homologue of kalliklectin, a novel lectin that was previously found in the flathead teleost Platycephalus indicus and has structural similarity to mammalian plasma kallikreins and coagulation factor XI. This is the second report of a kalliklectin, but the fugu kalliklectin differs in its sugar-binding spectra, intersubunit association and tissue distribution from the previously identified flathead kalliklectin. These findings indicate that kalliklectins vary in properties among fish species.
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