Characterization, expression profiling and functional characterization of cathepsin Z (CTSZ) in turbot (Scophthalmus maximus L.)

In this study, we reported the identification of SmCTSZ, a CTSZ homolog from turbot (Scophthalmus maximus L.). SmCTSZ was 317 residues in length and contains a Pept-C1 domain. In multiple species comparison, SmCTSZ shared 65–93% overall sequence identities with the CTSZ counterparts from human, rat, and several fish species. In the phylogenetic analysis, SmCTSZ showed the closest relationship to Cynoglossus semilaevis. The syntenic analysis revealed the similar neighboring genes of CTSZ across all the selected species, which suggested the synteny encompassing CTSZ region during vertebrate evolution. Subsequently, SmCTSZ was constitutively expressed in various tissues, with the lowest and highest levels in brain and intestine respectively. In addition, SmCTSZ was significantly up-regulate...

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