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Effect of Hydrogen Peroxide on the Biosynthesis of Heme and Proteins: Potential Implications for the Partitioning of Glu-tRNA(Glu) between These Pathways
Glutamyl-tRNA (Glu-tRNA(Glu)) is the common substrate for both protein translation and heme biosynthesis via the C(5) pathway. Under normal conditions, an adequate supply of this aminoacyl-tRNA is available to both pathways. However, under certain circumstances, Glu-tRNA(Glu) can become scarce, resu...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2014
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4284751/ https://www.ncbi.nlm.nih.gov/pubmed/25514408 http://dx.doi.org/10.3390/ijms151223011 |
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author | Farah, Carolina Levicán, Gloria Ibba, Michael Orellana, Omar |
author_facet | Farah, Carolina Levicán, Gloria Ibba, Michael Orellana, Omar |
author_sort | Farah, Carolina |
collection | PubMed |
description | Glutamyl-tRNA (Glu-tRNA(Glu)) is the common substrate for both protein translation and heme biosynthesis via the C(5) pathway. Under normal conditions, an adequate supply of this aminoacyl-tRNA is available to both pathways. However, under certain circumstances, Glu-tRNA(Glu) can become scarce, resulting in competition between the two pathways for this aminoacyl-tRNA. In Acidithiobacillus ferrooxidans, glutamyl-tRNA synthetase 1 (GluRS1) is the main enzyme that synthesizes Glu-tRNA(Glu). Previous studies have shown that GluRS1 is inactivated in vitro by hydrogen peroxide (H(2)O(2)). This raises the question as to whether H(2)O(2) negatively affects in vivo GluRS1 activity in A. ferrooxidans and whether Glu-tRNA(Glu) distribution between the heme and protein biosynthesis processes may be affected by these conditions. To address this issue, we measured GluRS1 activity. We determined that GluRS1 is inactivated when cells are exposed to H(2)O(2), with a concomitant reduction in intracellular heme level. The effects of H(2)O(2) on the activity of purified glutamyl-tRNA reductase (GluTR), the key enzyme for heme biosynthesis, and on the elongation factor Tu (EF-Tu) were also measured. While exposing purified GluTR, the first enzyme of heme biosynthesis, to H(2)O(2) resulted in its inactivation, the binding of glutamyl-tRNA to EF-Tu was not affected. Taken together, these data suggest that in A. ferrooxidans, the flow of glutamyl-tRNA is diverted from heme biosynthesis towards protein synthesis under oxidative stress conditions. |
format | Online Article Text |
id | pubmed-4284751 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2014 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-42847512015-01-21 Effect of Hydrogen Peroxide on the Biosynthesis of Heme and Proteins: Potential Implications for the Partitioning of Glu-tRNA(Glu) between These Pathways Farah, Carolina Levicán, Gloria Ibba, Michael Orellana, Omar Int J Mol Sci Article Glutamyl-tRNA (Glu-tRNA(Glu)) is the common substrate for both protein translation and heme biosynthesis via the C(5) pathway. Under normal conditions, an adequate supply of this aminoacyl-tRNA is available to both pathways. However, under certain circumstances, Glu-tRNA(Glu) can become scarce, resulting in competition between the two pathways for this aminoacyl-tRNA. In Acidithiobacillus ferrooxidans, glutamyl-tRNA synthetase 1 (GluRS1) is the main enzyme that synthesizes Glu-tRNA(Glu). Previous studies have shown that GluRS1 is inactivated in vitro by hydrogen peroxide (H(2)O(2)). This raises the question as to whether H(2)O(2) negatively affects in vivo GluRS1 activity in A. ferrooxidans and whether Glu-tRNA(Glu) distribution between the heme and protein biosynthesis processes may be affected by these conditions. To address this issue, we measured GluRS1 activity. We determined that GluRS1 is inactivated when cells are exposed to H(2)O(2), with a concomitant reduction in intracellular heme level. The effects of H(2)O(2) on the activity of purified glutamyl-tRNA reductase (GluTR), the key enzyme for heme biosynthesis, and on the elongation factor Tu (EF-Tu) were also measured. While exposing purified GluTR, the first enzyme of heme biosynthesis, to H(2)O(2) resulted in its inactivation, the binding of glutamyl-tRNA to EF-Tu was not affected. Taken together, these data suggest that in A. ferrooxidans, the flow of glutamyl-tRNA is diverted from heme biosynthesis towards protein synthesis under oxidative stress conditions. MDPI 2014-12-11 /pmc/articles/PMC4284751/ /pubmed/25514408 http://dx.doi.org/10.3390/ijms151223011 Text en © 2014 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Farah, Carolina Levicán, Gloria Ibba, Michael Orellana, Omar Effect of Hydrogen Peroxide on the Biosynthesis of Heme and Proteins: Potential Implications for the Partitioning of Glu-tRNA(Glu) between These Pathways |
title | Effect of Hydrogen Peroxide on the Biosynthesis of Heme and Proteins: Potential Implications for the Partitioning of Glu-tRNA(Glu) between These Pathways |
title_full | Effect of Hydrogen Peroxide on the Biosynthesis of Heme and Proteins: Potential Implications for the Partitioning of Glu-tRNA(Glu) between These Pathways |
title_fullStr | Effect of Hydrogen Peroxide on the Biosynthesis of Heme and Proteins: Potential Implications for the Partitioning of Glu-tRNA(Glu) between These Pathways |
title_full_unstemmed | Effect of Hydrogen Peroxide on the Biosynthesis of Heme and Proteins: Potential Implications for the Partitioning of Glu-tRNA(Glu) between These Pathways |
title_short | Effect of Hydrogen Peroxide on the Biosynthesis of Heme and Proteins: Potential Implications for the Partitioning of Glu-tRNA(Glu) between These Pathways |
title_sort | effect of hydrogen peroxide on the biosynthesis of heme and proteins: potential implications for the partitioning of glu-trna(glu) between these pathways |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4284751/ https://www.ncbi.nlm.nih.gov/pubmed/25514408 http://dx.doi.org/10.3390/ijms151223011 |
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