title: Cloning and functional analysis of glutathione peroxidase gene in red swamp crayfish Procambarus clarkii.
abstract: Glutathione peroxidases (GPxs) are key enzymes in the antioxidant defense systems of living organisms, including crustaceans. The red swamp crayfish Procambarus clarkii is the most commonly farmed freshwater crayfish in Chinese inland nowadays due to its commercial value. However, high stocking density has resulted in adverse effects in growth performance and health. To investigate the function of GPxs in immune defense of the crayfish, we cloned and characterized a full length GPx (PcGPx) from P. clarkii by a reverse-transcription polymerase chain reaction (RT-PCR) and rapid amplification of cDNA ends (RACE). The 931 bp PcGPx cDNA contains a 38 bp 5'-untranslated region (UTR), a 519 bp coding sequence (CDS) and a 375 bp 3'-UTR with a selenocysteine insertion sequence (SECIS). The PcGPx was predicted to encode 172 amino acids, and its putative molecular mass was 20.9 kDa with a pI of 4.37. A selenocysteine (Sec) encoded by the unusual stop codon, TGA, was in the protein coding region. Phylogenetic analysis showed that PcGPx clustered with the GPxs from the penaeid shrimp Metapenaeus ensis and Caenorhabditis elegans, sharing much higher similarity with vertebrate GPx1 and GPx2 than with GPx3 and GPx5. Quantitative RT-PCR revealed that PcGPx was extremely highly expressed in ovary and early embryos. In addition, the levels of PcGPx mRNA and reactive oxygen species (ROS) significantly increased after challenge with gram-negative Vibrio harveyi, gram-positive Staphyloccocus aureus or white spot syndrome virus (WSSV). These results suggest that PcGPx may play important roles not only in immune defense, but also in oogenesis in the crayfish.
authors.affiliation: Hubei Key Laboratory of Genetic Regulation and Integrative Biology, College of Life Science, Central China Normal University, Wuhan 430079, PR China.
authors.forename: Xiao-Fei
authors.initials: XF
authors.lastname: Xia
authors.forename: Jin-Jing
authors.initials: JJ
authors.lastname: Zheng
authors.forename: Guang-Ming
authors.initials: GM
authors.lastname: Shao
authors.forename: Jia-Lin
authors.initials: JL
authors.lastname: Wang
authors.forename: Xu-Sheng
authors.initials: XS
authors.lastname: Liu
authors.forename: Yu-Feng
authors.initials: YF
authors.lastname: Wang
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D060829:Arthropod Proteins / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D003400:Astacoidea / Q000201:enzymology / Q000235:genetics* / Q000276:immunology*; D001483:Base Sequence; D003001:Cloning, Molecular; D005979:Glutathione Peroxidase / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D007113:Immunity, Innate; D008969:Molecular Sequence Data; D009928:Organ Specificity; D010802:Phylogeny; D020133:Reverse Transcriptase Polymerase Chain Reaction; D016415:Sequence Alignment; D013211:Staphylococcus aureus / Q000502:physiology; D014733:Vibrio / Q000502:physiology; D046848:White spot syndrome virus 1 / Q000502:physiology
chemical_list: D060829:Arthropod Proteins; D005979:Glutathione Peroxidase