title: Molecular characterization and expression analysis of elongation factors 1A and 2 from the Pacific white shrimp, Litopenaeus vannamei.
abstract: Elongation factors (EF) are abundant cell proteins that play important roles in the metabolism of all multicellular organisms. Here we describe a functional analysis of elongation factor 1-alpha (EF1A) and elongation factor 2 (EF2), from the Pacific white shrimp, Litopenaeus vannamei. Full-length cDNAs of genes corresponding to EF1A and EF2 were obtained that were 1547 and 2729 bp long, with open reading frames encoding 461 and 846 amino acids, respectively. The deduced amino acid sequences of L. vannamei EF1A and EF2 showed high similarity with those from mice, humans, chickens and other shrimps. RT-PCR analysis indicated that mRNA transcripts of EF1A and EF2 are strongly (but differentially) expressed in haemocytes and gill tissue, and at varying levels in other examined tissues, of the shrimps. Levels of both EF1A and EF2 transcripts increased when shrimps were challenged by pH and cadmium stress, but reached maximal levels after different exposure periods. These results indicate that EF1A and EF2 may play distinct, essential roles in the repair of cellular damage induced by pH and cadmium stress.
authors.affiliation: Key Laboratory of Ecology and Environment Science in Guangdong Higher Education, Guangdong Provincial Key Laboratory for Healthy and Safe Aquaculture, College of Life Science, South China Normal University, Guangzhou 510631, People's Republic of China.
authors.forename: Lei
authors.initials: L
authors.lastname: Wang
authors.forename: Yuan
authors.initials: Y
authors.lastname: Liu
authors.forename: Wei-Na
authors.initials: WN
authors.lastname: Wang
authors.forename: Wei-Jun
authors.initials: WJ
authors.lastname: Mai
authors.forename: Yu
authors.initials: Y
authors.lastname: Xin
authors.forename: Jun
authors.initials: J
authors.lastname: Zhou
authors.forename: Wen-Yin
authors.initials: WY
authors.lastname: He
authors.forename: An-Li
authors.initials: AL
authors.lastname: Wang
authors.forename: Ru-Yong
authors.initials: RY
authors.lastname: Sun
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D002104:Cadmium / Q000633:toxicity; D003001:Cloning, Molecular; D020869:Gene Expression Profiling; D005786:Gene Expression Regulation; D043143:Hepatopancreas / Q000187:drug effects / Q000378:metabolism; D006801:Humans; D006863:Hydrogen-Ion Concentration / Q000187:drug effects; D008969:Molecular Sequence Data; D010140:Pacific Ocean; D033561:Penaeidae / Q000187:drug effects / Q000235:genetics*; D020648:Peptide Elongation Factor 1 / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D020652:Peptide Elongation Factor 2 / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D010802:Phylogeny; D016415:Sequence Alignment; D017422:Sequence Analysis, DNA; D013045:Species Specificity
chemical_list: D020648:Peptide Elongation Factor 1; D020652:Peptide Elongation Factor 2; D002104:Cadmium