Effect of Temperature on Stability and Activity of Elongation Factor 2 Proteins from Antarctic and Thermophilic Methanogens
ABSTRACT Despite the presence and abundance of archaea in low-temperature environments, little information is available regarding their physiological and biochemical properties. In order to investigate the adaptation of archaeal proteins to low temperatures, we purified and characterized the elongat...
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crasmicro:10.1128/jb.182.5.1328-1332.2000 2024-06-23T07:47:56+00:00 Effect of Temperature on Stability and Activity of Elongation Factor 2 Proteins from Antarctic and Thermophilic Methanogens Thomas, Torsten Cavicchioli, Ricardo 2000 http://dx.doi.org/10.1128/jb.182.5.1328-1332.2000 https://journals.asm.org/doi/pdf/10.1128/JB.182.5.1328-1332.2000 en eng American Society for Microbiology https://journals.asm.org/non-commercial-tdm-license Journal of Bacteriology volume 182, issue 5, page 1328-1332 ISSN 0021-9193 1098-5530 journal-article 2000 crasmicro https://doi.org/10.1128/jb.182.5.1328-1332.2000 2024-06-10T04:07:34Z ABSTRACT Despite the presence and abundance of archaea in low-temperature environments, little information is available regarding their physiological and biochemical properties. In order to investigate the adaptation of archaeal proteins to low temperatures, we purified and characterized the elongation factor 2 (EF-2) protein from the Antarctic methanogen Methanococcoides burtonii , which was expressed in Escherichia coli , and compared it to the recombinant EF-2 protein from a phylogenetically related thermophile, Methanosarcina thermophila . Using differential scanning calorimetry to assess protein stability and enzyme assays for the intrinsic GTPase activity, we identified biochemical and biophysical properties that are characteristic of the cold-adapted protein. This includes a higher activity at low temperatures caused by a decrease of the activation energy necessary for GTP hydrolysis and a decreased activation energy for the irreversible denaturation of the protein, which indicates a less thermostable structure. Comparison of the in vitro properties of the proteins with the temperature-dependent characteristics of growth of the organisms indicates that additional cytoplasmic factors are likely to be important for the complete thermal adaptation of the proteins in vivo. This is the first study to address thermal adaptation of proteins from a free-living, cold-adapted archaeon, and our results indicate that the ability of the Antarctic methanogen to adapt to the cold is likely to involve protein structural changes. Article in Journal/Newspaper Antarc* Antarctic ASM Journals (American Society for Microbiology) Antarctic The Antarctic Journal of Bacteriology 182 5 1328 1332 |
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ASM Journals (American Society for Microbiology) |
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English |
description |
ABSTRACT Despite the presence and abundance of archaea in low-temperature environments, little information is available regarding their physiological and biochemical properties. In order to investigate the adaptation of archaeal proteins to low temperatures, we purified and characterized the elongation factor 2 (EF-2) protein from the Antarctic methanogen Methanococcoides burtonii , which was expressed in Escherichia coli , and compared it to the recombinant EF-2 protein from a phylogenetically related thermophile, Methanosarcina thermophila . Using differential scanning calorimetry to assess protein stability and enzyme assays for the intrinsic GTPase activity, we identified biochemical and biophysical properties that are characteristic of the cold-adapted protein. This includes a higher activity at low temperatures caused by a decrease of the activation energy necessary for GTP hydrolysis and a decreased activation energy for the irreversible denaturation of the protein, which indicates a less thermostable structure. Comparison of the in vitro properties of the proteins with the temperature-dependent characteristics of growth of the organisms indicates that additional cytoplasmic factors are likely to be important for the complete thermal adaptation of the proteins in vivo. This is the first study to address thermal adaptation of proteins from a free-living, cold-adapted archaeon, and our results indicate that the ability of the Antarctic methanogen to adapt to the cold is likely to involve protein structural changes. |
format |
Article in Journal/Newspaper |
author |
Thomas, Torsten Cavicchioli, Ricardo |
spellingShingle |
Thomas, Torsten Cavicchioli, Ricardo Effect of Temperature on Stability and Activity of Elongation Factor 2 Proteins from Antarctic and Thermophilic Methanogens |
author_facet |
Thomas, Torsten Cavicchioli, Ricardo |
author_sort |
Thomas, Torsten |
title |
Effect of Temperature on Stability and Activity of Elongation Factor 2 Proteins from Antarctic and Thermophilic Methanogens |
title_short |
Effect of Temperature on Stability and Activity of Elongation Factor 2 Proteins from Antarctic and Thermophilic Methanogens |
title_full |
Effect of Temperature on Stability and Activity of Elongation Factor 2 Proteins from Antarctic and Thermophilic Methanogens |
title_fullStr |
Effect of Temperature on Stability and Activity of Elongation Factor 2 Proteins from Antarctic and Thermophilic Methanogens |
title_full_unstemmed |
Effect of Temperature on Stability and Activity of Elongation Factor 2 Proteins from Antarctic and Thermophilic Methanogens |
title_sort |
effect of temperature on stability and activity of elongation factor 2 proteins from antarctic and thermophilic methanogens |
publisher |
American Society for Microbiology |
publishDate |
2000 |
url |
http://dx.doi.org/10.1128/jb.182.5.1328-1332.2000 https://journals.asm.org/doi/pdf/10.1128/JB.182.5.1328-1332.2000 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Journal of Bacteriology volume 182, issue 5, page 1328-1332 ISSN 0021-9193 1098-5530 |
op_rights |
https://journals.asm.org/non-commercial-tdm-license |
op_doi |
https://doi.org/10.1128/jb.182.5.1328-1332.2000 |
container_title |
Journal of Bacteriology |
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182 |
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5 |
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1328 |
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1332 |
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1802638216780578816 |