A comparison of the metabolic cost of protein synthesis in stenothermal and eurythermal isopod crustaceans

The American Journal of Physiology
N M WhiteleyA J El Haj

Abstract

To examine the presence of metabolic cold adaptation in Antarctic isopods, whole animal rates of oxygen uptake (MVo2) and protein synthesis were measured in Glyptonotus antarcticus at 0 degree C and compared with the temperature isopod Idotea rescata at 4 and 14 degrees C. The specific relationship between rates of metabolism and protein synthesis was investigated by injecting animals with cycloheximide, a protein synthesis inhibitor. In G. antarcticus, routine MVo2 was 11.10 +/- 0.89 mumol.kg-1.min-1 (n = 19 animals), and ks was 0.24 +/- 0.04% protein synthesized/day (n = 8 animals). Comparison with I. rescata showed that standardized whole animal MVo2 decreased with temperature (temperature quotient = 1.99), but whole animal ks was considerably lower in the Antarctic isopod; 66 and 22% of total MVo2 was attributable to protein synthesis in G. antarcticus at 0 degree C and I. rescata at 4 degrees C, respectively. The energetic cost of protein synthesis was four times higher in G. antarcticus at 885 +/- 141 mmol ATP/g protein (n = 5 animals) compared with 237 +/- 76 mmol ATP/g protein (n = 6) in I. rescata. G. antarcticus does not show metabolic rate compensation and maintains extremely low ks levels because of the relatively h...Continue Reading

Citations

Sep 21, 2013·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Kristin M HardyLouis E Burnett
May 19, 2019·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Shuangyao WangGregory G Smith
Jun 5, 2007·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Andrew D BowgenAndrew Clarke
Jun 19, 2002·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Julian L PakayMichael Guppy
Jun 9, 2005·The Journal of Experimental Biology·Daniela StorchHans O Pörtner
Jul 24, 2007·The Journal of Experimental Biology·Keiron P P FraserLloyd S Peck

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