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In vitro protein synthesis capacities in a cold stenothermal and a temperate eurythermal pectinid
D Storch1, O Heilmayer, I Hardewig
1Benthic Systems, Ecophysiology and Ecotoxicology, Alfred Wegener Institute for Polar and Marine Research, Columbusstrasse, D-27568, Bremerhaven, Germany.
Summary
Antarctic scallops show cold-compensated protein synthesis, maintaining high translational capacity even at 0°C. This adaptation, linked to RNA levels, differs from temperate scallops and may explain survival in cold, food-limited environments.
Area of Science:
- Marine Biology
- Biochemistry
- Physiology
Background:
- The Antarctic scallop Adamussium colbecki is adapted to a permanently cold environment.
- Understanding protein synthesis in cold-adapted species is crucial for explaining their metabolic strategies.
Purpose of the Study:
- To compare in vitro protein synthesis and RNA translational capacities between the Antarctic scallop (Adamussium colbecki) and the European scallop (Aequipecten opercularis).
- To investigate the thermal sensitivity of the translational machinery in these species.
- To assess the impact of long-term aquarium maintenance on protein synthesis in A. colbecki.
Main Methods:
- Isolation of the translational system from scallop gills for in vitro protein synthesis assays.
- Measurement of in vitro protein synthesis capacity and RNA translational capacity.
- Analysis of thermal sensitivity using Arrhenius activation energies (Ea) and Q10 values.
Main Results:
- In vitro protein synthesis capacity at 0°C in A. colbecki was comparable to that of A. opercularis at 25°C, suggesting cold compensation.
- A. colbecki exhibited lower Arrhenius activation energies (Ea) and Q10 values, indicating reduced thermal sensitivity of its translation machinery.
- Long-term aquarium maintenance led to reduced protein synthesis and translational capacities in A. colbecki, attributed to loss of the protein synthesis machinery (reduced RNA levels).
Conclusions:
- High RNA levels and translational capacity in A. colbecki likely contribute to cold-compensated protein synthesis.
- The findings suggest that A. colbecki possesses a translation machinery with lower thermal sensitivity, aiding survival in polar conditions.
- Metabolic depression, potentially involving reduced food uptake or seasonal strategies, may explain decreased protein synthesis in aquarium-maintained scallops.