Gene cloning of a sigma class glutathione S-transferase from abalone (Haliotis diversicolor) and expression analysis upon bacterial challenge.
Glutathione S-transferases (GSTs) are a multigene family of xenobiotic metabolizing phase II detoxification enzymes which take part in many pathological and physiological processes, and which can potentially be used as indicators and biomarkers for cancer diagnoses and organic or inorganic pollutant exposure. In this study, a full-length cDNA of a sigma class GST (abGSTsigma) (GenBank accession number EF546619) from variously colored abalone (Haliotis diversicolor) was identified. It was 1328bp containing an open reading frame of 624bp, encoding 208 amino acid residues with a predicted protein molecular weight of 23.67kDa and an estimated pI of 5.67. Sequence analysis showed that the predicted protein sequence of abGSTsigma cDNA contained the conserved domain of the GST_N_Sigma_like (PSSM: cd03039) and GST_C_Sigma_like (PSSM: cd03192). Alignment analysis demonstrated that the abGSTsigma of H. diversicolor was in a branch position with other known class sigma GSTs from different organisms. The abGSTsigma mRNA was distributed in multiple tissues tested and was highly demonstrated in the gill and mantle of normal abalones. In bacteria-challenged abalone, the abGSTsigma gene was significantly expressed in the hemocytes, gill, mantle and digestive gland and the total GSTs enzyme and SOD were also induced in the four tissues. The increased activities of SOD and GSTs can result in the elimination of reactive oxygen species (ROS) indicating antioxidant activities involved. The preliminary work revealed that the sigma class glutathione S-transferase gene abGSTsigma, a phase II detoxification enzyme, had a positive response to bacterial challenge, and that will lead to an insightful study on elucidating the interactions between immune responses and biotransformation exerted by abGSTsigma.
State Key Laboratory of Marine Environmental Science, College of Oceanography and Environmental Science, Xiamen University, Xiamen, China.
Hong-Lin
HL
Ren
Dan-Dan
DD
Xu
Singaram
S
Gopalakrishnan
Kun
K
Qiao
Wei-Bin
WB
Huang
Ke-Jian
KJ
Wang
D000595:Amino Acid Sequence; D000818:Animals; D001419:Bacteria; D001483:Base Sequence; D003001:Cloning, Molecular; D005260:Female; D049851:Gastropoda / Q000201:enzymology / Q000276:immunology* / Q000382:microbiology*; D005982:Glutathione Transferase / Q000096:biosynthesis* / Q000235:genetics; D008969:Molecular Sequence Data; D010802:Phylogeny; D016415:Sequence Alignment; D013482:Superoxide Dismutase / Q000096:biosynthesis
D013482:Superoxide Dismutase; D005982:Glutathione Transferase