title: Molecular characterisation and expression analysis of the cathepsin H gene from rock bream (Oplegnathus fasciatus).
abstract: Cathepsins are lysosomal cysteine proteases belonging to the papain family, whose members play important roles in normal metabolism for the maintenance of cellular homeostasis. Rock bream (Oplegnathus fasciatus) cathepsin H (RbCTSH) cDNAs were identified by expressed sequence tag analysis of a lipopolysaccharide-stimulated rock bream liver cDNA library. The full-length RbCTSH cDNA (1326 bp) contained an open reading frame of 978 bp encoding 325 amino acids. The presence of an ERFNIN-like motif was predicted in the propeptide region of RbCTSH. Furthermore, multiple alignments showed that the EPQNCSAT region was well conserved among other cathepsin H sequences. Phylogenetic analysis revealed that RbCTSH is most closely related to Nile tilapia cathepsin H. RbCTSH was expressed significantly in the intestine, spleen, head kidney and stomach. RbCTSH mRNA expression was also examined in several tissues under conditions of bacterial and viral challenge. All examined tissues of fish infected with Edwardsiella tarda, Streptococcus iniae and red sea bream iridovirus (RSIV) showed significant increases in RbCTSH expression compared to the control. In the kidney and spleen, RbCTSH mRNA expression was upregulated markedly following infection with bacterial pathogens. These findings indicate that RbCTSH plays an important role in the innate immune response of rock bream. Furthermore, these results provide important information for the identification of other cathepsin H genes in various fish species.
authors: Department of Marine Biology & Aquaculture, Institute of Marine Industry, College of Marine Science, Gyeongsang National University, Tongyeong, Republic of Korea.
authors: Ju-Won
authors: JW
authors: Kim
authors: Chan-Il
authors: CI
authors: Park
authors: Seong Don
authors: SD
authors: Hwang
authors: Ji-Min
authors: JM
authors: Jeong
authors: Ki-Hyuk
authors: KH
authors: Kim
authors: Do-Hyung
authors: DH
authors: Kim
authors: Sang Hee
authors: SH
authors: Shim
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D056655:Cathepsin H / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D004266:DNA Virus Infections / Q000276:immunology / Q000662:veterinary / Q000821:virology; D018076:DNA, Complementary / Q000235:genetics / Q000378:metabolism; D020609:Edwardsiella tarda / Q000502:physiology; D004756:Enterobacteriaceae Infections / Q000276:immunology / Q000382:microbiology / Q000662:veterinary; D020224:Expressed Sequence Tags; D005393:Fish Diseases / Q000276:immunology / Q000382:microbiology / Q000821:virology; D029941:Fish Proteins / Q000235:genetics* / Q000378:metabolism; D007497:Iridoviridae / Q000502:physiology; D008969:Molecular Sequence Data; D009928:Organ Specificity; D010473:Perciformes / Q000235:genetics* / Q000276:immunology* / Q000378:metabolism; D010802:Phylogeny; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D016415:Sequence Alignment / Q000662:veterinary; D013290:Streptococcal Infections / Q000276:immunology / Q000382:microbiology / Q000662:veterinary; D013291:Streptococcus / Q000502:physiology
chemical_list: D018076:DNA, Complementary; D029941:Fish Proteins; D012333:RNA, Messenger; D056655:Cathepsin H