title: Molecular cloning and immunohistochemical localization of ubiquitin C-Terminal hydrolase expressed in testis of a teleost, the Nile Tilapia, Oreochromis niloticus.
abstract: We previously produced four monoclonal antibodies to testicular proteins of a teleost, the Nile tilapia. One of the monoclonal antibodies, TAT(Testicular Antigen of Tilapia)-10, recognizes a Mr=27,000 protein (27 kD protein), which is present in A and early B type spermatogonia, spermatids, and spermatozoa in testis. In order to clarify the function of this protein, molecular cloning was conducted. The cDNA for the 27 kD protein contains a complete open reading frame encoding 220 amino acid residues. The predicted amino acid sequence of the 27 kD protein was homologous to those of the ubiquitin carboxy-terminal hydrolases (UCH) reported in mammals. The measurement of the ubiquitin-releasing activity of the recombinant 27 kD protein revealed that the protein is the active form of UCH. Northern blot analysis showed that the UCH mRNA was expressed in ovary and brain in addition to the testis. Immunohistochemical study showed that, in brain, UCH was localized especially on the olfactory organ including the olfactory bulb and olfactory epithelium in olfactory rosetta, suggesting the involvement of the protein in chemoreceptive function. In the Tilapia ovary, UCH localized especially in pre-vitellogenic oocytes, suggesting that the enzyme activity could be important in oocyte growth. This is the first report for the cDNA cloning and cellular localization of UCH in fish. J. Exp. Zool. 293:368-383, 2002.
authors.affiliation: Hokkaido National Fisheries Research Institute, Kushiro, Hokkaido 085-0802, Japan.
authors.forename: Kazuhiko
authors.initials: K
authors.lastname: Mochida
authors.forename: Takahiro
authors.initials: T
authors.lastname: Matsubara
authors.forename: Hideaki
authors.initials: H
authors.lastname: Kudo
authors.forename: Tadashi
authors.initials: T
authors.lastname: Andoh
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Ueda
authors.forename: Shinji
authors.initials: S
authors.lastname: Adachi
authors.forename: Kohei
authors.initials: K
authors.lastname: Yamauchi
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D023681:Cichlids / Q000235:genetics; D003001:Cloning, Molecular; D020869:Gene Expression Profiling; D018507:Gene Expression Regulation, Developmental; D006801:Humans; D008297:Male; D008969:Molecular Sequence Data; D013737:Testis / Q000201:enzymology; D043222:Ubiquitin Thiolesterase / Q000235:genetics
chemical_list: D043222:Ubiquitin Thiolesterase