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Comparison of whole animal costs of protein synthesis among polar and temperate populations of the same species of gammarid amphipod.
Artigo em Inglês | MEDLINE | ID: mdl-28263884
Protein synthesis can account for a substantial proportion of metabolic rate. Energetic costs of protein synthesis, should in theory, be the same in marine invertebrates from a range of thermal habitats, and yet direct measurements using inhibitors produce widely differing values, especially in the cold. The present study aimed to remove any potential confounding interspecific effects by determining costs of protein synthesis in two latitudinally separated populations of the same species (amphipod, Gammarus oceanicus) living in two different thermal regimes; polar vs cold-temperate. Costs of protein synthesis were determined in summer acclimatised G. oceanicus from Svalbard (79°N) at 5°C and from Scotland (58°N) at 13°C. Amphipods were injected with the protein synthesis inhibitor, cycloheximide (CHX), at 9mmoll-1 in crab saline to give a tissue concentration of 0.05mgCHXg-1FW and left for 60min before the injection of [3H] phenylalanine. After incubation for 120min (180min in total from initial injection), both whole-animal rates of oxygen uptake and absolute rates of protein synthesis were significantly reduced in CHX-treated amphipods vs controls injected with saline. Both populations exhibited similar costs of protein synthesis of ~7µmolO2mg-1protein which is close to the estimated theoretical minimum for peptide bond formation, and similar to the values obtained in cell-free systems. The study demonstrates that in G. oceanicus, costs of protein synthesis rates were not elevated in the cold but were fixed among polar and cold-temperate populations.





Texto completo: Disponível Coleções: Bases de dados internacionais Base de dados: MEDLINE Assunto principal: Biossíntese de Proteínas / Anfípodes / Metabolismo Energético / Aclimatação Tipo de estudo: Avaliação econômica em saúde Limite: Animais Idioma: Inglês Revista: Comp Biochem Physiol A Mol Integr Physiol Assunto da revista: Biologia Molecular / Fisiologia Ano de publicação: 2017 Tipo de documento: Artigo