Publication Date:
2001-03-10
Description:
Assessing the energy costs of development in extreme environments is important for understanding how organisms can exist at the margins of the biosphere. Macromolecular turnover rates of RNA and protein were measured at -1.5 degrees C during early development of an Antarctic sea urchin. Contrary to expectations of low synthesis with low metabolism at low temperatures, protein and RNA synthesis rates exhibited temperature compensation and were equivalent to rates in temperate sea urchin embryos. High protein metabolism with a low metabolic rate is energetically possible in this Antarctic sea urchin because the energy cost of protein turnover, 0.45 joules per milligram of protein, is 1/25th the values reported for other animals.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Marsh, A G -- Maxson , R E Jr -- Manahan, D T -- New York, N.Y. -- Science. 2001 Mar 9;291(5510):1950-2. Epub 2001 Feb 15.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biological Sciences, University of Southern California, Los Angeles, CA 90089, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11239152" target="_blank"〉PubMed〈/a〉
Keywords:
Animals
;
Antarctic Regions
;
Blastocyst/metabolism
;
Cold Temperature
;
Embryo, Nonmammalian/metabolism
;
Energy Metabolism
;
Half-Life
;
Kinetics
;
*Oxygen Consumption
;
*Protein Biosynthesis
;
Proteins/metabolism
;
RNA/*biosynthesis/metabolism
;
RNA, Messenger/biosynthesis/metabolism
;
Sea Urchins/*embryology/growth & development/*metabolism
;
Temperature
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
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