title: Identification of two hsp90 genes from the marine crab, Portunus trituberculatus and their specific expression profiles under different environmental conditions.
abstract: Hsp90, a molecular chaperone, was generally thought to be a unique cytoplasmic form in invertebrates, playing important roles in multiple cellular stress responses. Now, two cytoplasmic Hsp90 cDNAs (ptHSP90-1 and ptHSP90-2 genes) were isolated from an invertebrate - crab Portunus trituberculatus. Main features, sequence identities and phylogenetic analysis with other species were described. Expression profiles in tissues and under stressful conditions were analyzed using semi-quantitative RT-PCR method. ptHSP90-1 and ptHSP90-2 were constitutively expressed with higher transcript levels in ovary and muscle, respectively. A cold treatment rapidly activated both ptHSP90s transcription in hepatopancreas and gill, but caused the ptHSP90-2 mRNA decrease in muscle and ovary. Under heat treatment ptHSP90-1 mRNA was accumulated in hepatopancreas and muscle (but down-regulated in ovary), while ptHSP90-2's transcription tendency in each tissue was the same as that in cold shock. Moreover, the transcriptional levels of both ptHSP90 genes under Cu(2+) stress were evaluated. This crab exposed to the low and high salinity exhibited either lower expression levels of both ptHSP90s or no changes in four tissues except the up-regulation of ptHSP90-2 transcription in hepatopancreas. These results suggested there were at least two Hsp90s in P. trituberculatus, which played differing roles in physiological and stressful conditions.
authors.affiliation: College of Life Sciences, China Jiliang University, 258 Xueyuan Street, Xiasha, Hangzhou 310018, People's Republic China.
authors.forename: Xiao-Yan
authors.initials: XY
authors.lastname: Zhang
authors.forename: Ming-Zhou
authors.initials: MZ
authors.lastname: Zhang
authors.forename: Chun-Jing
authors.initials: CJ
authors.lastname: Zheng
authors.forename: Jun
authors.initials: J
authors.lastname: Liu
authors.forename: Hua-Jun
authors.initials: HJ
authors.lastname: Hu
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D003386:Brachyura / Q000235:genetics*; D003080:Cold Temperature; D003300:Copper / Q000378:metabolism; D018076:DNA, Complementary / Q000235:genetics; D004305:Dose-Response Relationship, Drug; D005260:Female; D020869:Gene Expression Profiling; D018841:HSP90 Heat-Shock Proteins / Q000235:genetics*; D043143:Hepatopancreas / Q000378:metabolism; D007526:Isoelectric Point; D008297:Male; D008969:Molecular Sequence Data; D008970:Molecular Weight; D009132:Muscles / Q000378:metabolism; D016366:Open Reading Frames; D010053:Ovary / Q000378:metabolism; D010802:Phylogeny; D021382:Protein Sorting Signals; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D017422:Sequence Analysis, DNA; D017386:Sequence Homology, Amino Acid; D012965:Sodium Chloride / Q000494:pharmacology*; D013312:Stress, Physiological; D014018:Tissue Distribution; D014158:Transcription, Genetic
chemical_list: D018076:DNA, Complementary; D018841:HSP90 Heat-Shock Proteins; D021382:Protein Sorting Signals; D012333:RNA, Messenger; D012965:Sodium Chloride; D003300:Copper