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Sorimachi, H., Toyama-Sorimachi, N., Saido, T.C., Kawasaki, H., Sugita, H., Miyasaka, M., Arahata, K., Ishiura, S. and Suzuki, K. (1993) Muscle-Specific Calpain, p94, Is Degraded by Autolysis Immediately after Translation, Resulting in Disappearance from Muscle. Journal of Biological Chemistry, 268, 10593-10605.

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• TITLE: Phylogenetic Analysis and Taste Cell Expression of Calpain 9 in Catfish (Ictalurus punctatus)

  AUTHORS: Tetsuya Ookura, Eiki Koyama, Anne Hansen, John H. Teeter, Yukio Kawamura, Joseph G. Brand

  KEYWORDS: Gene Evolution, Taste, Novel Type

  JOURNAL NAME: Natural Science, Vol.7 No.3, March 13, 2015

  ABSTRACT: The calpains, calcium-activated neutral proteases, play important roles in calcium-regulated intra-cellular signal transduction cascades. Here we report the isolation and initial characterization of a cDNA encoding a calpain 9, digestive tract specific calpain, from catfish taste epithelium. This calpain 9 (Ip-CAPN9a) shares 61% identity with human calpain 9. Phylogenetic analysis provides evidence that catfish calpain 9 and the related enzymes from Oncorhynchus mykiss, Danio rerio, Xenopus laevis, Mus musculus, Rattus norvegicus and Homo sapiens make up a distinct clade within the tissue-specific calpain family. Northern blot analysis reveals that Ip-CAPN9a is predominantly expressed in barbell and digestive tract, but not expressed in brain. An antibody against the N-terminal segment of Ip-CAPN9a recognizes cells within the taste buds in catfish barbells.