title: Molecular cloning, characterization and expression analysis of cytoplasmic Cu/Zn-superoxide dismutase (SOD) from pearl oyster Pinctada fucata.
abstract: Because of its capacity to rapidly convert superoxide to hydrogen peroxide, superoxide dismutase (SOD) is crucial in both intracellular signalling and regulation of oxidative stress. In this paper we report the cloning of a Cu/Zn SOD (designated as pfSOD) from the pearl oyster (Pinctada fucata) using rapid amplification of cDNA ends (RACE) PCR. The full-length cDNA of this Cu/Zn SOD contains an open reading frame (ORF) of 471 bp coding for 156 amino acids. No signal peptide was identified at the N-terminal amino acid sequence of Cu/Zn SOD indicating that this pfSOD encodes a cytoplasmic Cu/Zn SOD. This is supported by the presence of conserved amino acids required for binding copper and zinc. Semi-quantitative analysis in adult tissues showed that the pfSOD mRNA was abundantly expressed in haemocytes and gill and scarcely expressed in other tissues tested. After challenge with lipopolysaccharide (LPS), expression of pfSOD mRNA in haemocytes was increased, reaching the highest level at 8 h, then dropping to basal levels at 36 h. These results suggest that Cu/Zn SOD might be used as a bioindicator of the aquatic environmental pollution and cellular stress in pearl oyster.
authors: Marine Biotechnology Division, Central Marine Fisheries Research Institute, P.B. No 1603, Ernakulam North P.O., Kochi 682018, Kerala, India. anju.moonjely@gmail.com
authors: A
authors: A
authors: Anju
authors: J
authors: J
authors: Jeswin
authors: P C
authors: PC
authors: Thomas
authors: M P
authors: MP
authors: Paulton
authors: K K
authors: KK
authors: Vijayan
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D003001:Cloning, Molecular; D018076:DNA, Complementary / Q000032:analysis / Q000235:genetics; D008070:Lipopolysaccharides / Q000008:administration & dosage; D008969:Molecular Sequence Data; D016366:Open Reading Frames; D009928:Organ Specificity; D010802:Phylogeny; D049911:Pinctada / Q000737:chemistry / Q000201:enzymology / Q000235:genetics* / Q000276:immunology; D012333:RNA, Messenger / Q000032:analysis / Q000235:genetics; D060888:Real-Time Polymerase Chain Reaction / Q000662:veterinary; D016415:Sequence Alignment / Q000662:veterinary; D013482:Superoxide Dismutase / Q000737:chemistry / Q000235:genetics* / Q000276:immunology / Q000378:metabolism
chemical_list: D018076:DNA, Complementary; D008070:Lipopolysaccharides; D012333:RNA, Messenger; D013482:Superoxide Dismutase