Energetic cost of synthesizing proteins in Antarctic limpet, Nacella concinna (Strebel, 1908), is not temperature dependent

Bowgen, Andrew G.; Fraser, Keiron P.P.; Peck, Lloyd S. ORCID:; Clarke, Andrew ORCID: 2007 Energetic cost of synthesizing proteins in Antarctic limpet, Nacella concinna (Strebel, 1908), is not temperature dependent. American Journal of Physiology - Regulatory, Integrative and Comparative Physiology, 292 (6). R2266-R2274.

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The energetic cost of protein synthesis is thought to account for a significant proportion of total metabolism. However, attempts to estimate the energetic cost of synthesizing proteins have resulted in surprisingly variable results, particularly for the small number of polar organisms studied, where cost estimates vary by two orders of magnitude. Much of this variability is probably the result of differing methodologies and experimental designs. Here we have used two different, carefully validated methods to measure the costs of protein synthesis in Antarctic limpets. One method, which utilized a specific protein synthesis inhibitor, was used to measure the cost of protein synthesis at two temperatures to test the hypothesis that the cost of protein synthesis varies with temperature. The cost of protein synthesis measured using the inhibitor cycloheximide was 13.95 ± 0.77 µmol O2/mg protein, while correlation of absolute protein synthesis with oxygen consumption suggested the cost of protein synthesis was 19.58 µmol O2/mg protein. Water temperature did not alter the cost of protein synthesis in Nacella concinna (Student's t-test, P = 0.849, t = 0.19, df = 12). In a meta-analysis of literature values for the cost of protein synthesis there was no significant effect of temperature, but there was a significant relationship between the concentration of cycloheximide used to inhibit protein synthesis and the measured cost.

Item Type: Publication - Article
Digital Object Identifier (DOI):
Programmes: BAS Programmes > Global Science in the Antarctic Context (2005-2009) > Biodiversity, Functions, Limits and Adaptation from Molecules to Ecosystems
ISSN: 0363-6119
Additional Keywords: protein metabolism; cycloheximide; polar; growth
NORA Subject Terms: Zoology
Date made live: 27 May 2008 14:40 +0 (UTC)

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