Life in the freezer: Protein metabolism in Antarctic fish

Fraser, Keiron P.P.; Peck, Lloyd S. ORCID: https://orcid.org/0000-0003-3479-6791; Clark, Melody S. ORCID: https://orcid.org/0000-0002-3442-3824; Clarke, Andrew ORCID: https://orcid.org/0000-0002-7582-3074; Hill, Simeon L. ORCID: https://orcid.org/0000-0003-1441-8769. 2022 Life in the freezer: Protein metabolism in Antarctic fish. Royal Society Open Science, 9, 211272. 13, pp. https://doi.org/10.1098/rsos.211272

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Abstract/Summary

Whole-animal, in vivo protein metabolism rates have been reported in temperate and tropical, but not Antarctic fish. Growth in Antarctic species is generally slower than lower latitude species. Protein metabolism data for Antarctic invertebrates show low rates of protein synthesis and unusually high rates of protein degradation. Additionally, in Antarctic fish, increasing evidence suggests a lower frequency of successful folding of nascent proteins and reduced protein stability. This study reports the first whole-animal protein metabolism data for an Antarctic fish. Groups of Antarctic, Harpagifer antarcticus, and temperate, Lipophrys pholis, fish were acclimatized to a range of overlapping water temperatures and food consumption, whole-animal growth and protein metabolism measured. The rates of protein synthesis and growth in Antarctic, but not temperate fish, were relatively insensitive to temperature and were significantly lower in H. antarcticus at 3°C than in L. pholis. Protein degradation was independent of temperature in H. antarcticus and not significantly different to L. pholis at 3°C, while protein synthesis retention efficiency was significantly higher in L. pholis than H. antarcticus at 3°C. These results suggest Antarctic fish degrade a significantly larger proportion of synthesized protein than temperate fish, with fundamental energetic implications for growth at low temperatures.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.1098/rsos.211272
Additional Keywords:	Protein turnover, slow growth, temperature limitation, cryobiology, Antarctic, protein synthesis.
Date made live:	13 Mar 2022 08:46 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/531928

Item Type:

Publication - Article

Digital Object Identifier (DOI):

https://doi.org/10.1098/rsos.211272

Additional Keywords:

Protein turnover, slow growth, temperature limitation, cryobiology, Antarctic, protein synthesis.

Date made live:

13 Mar 2022 08:46 +0 (UTC)

URI:

https://nora.nerc.ac.uk/id/eprint/531928