Isocitrate lyase activity and antioxidant responses in copper-stressed cultures of Chlamydomonas reinhardtii (Volvocales, Chlorophyceae)
The effect of copper-imposed oxidative stress on isocitrate lyase (ICL) activity was studied in a Chlamydomonas reinhardtii wild type and a copper-tolerant pleiotropic mutant strain. Suspension batch bioassays were performed adding copper chloride under moderate irradiation. Two harvest points were...
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Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00318884_v51_n2_p135_Sztrum http://hdl.handle.net/20.500.12110/paper_00318884_v51_n2_p135_Sztrum |
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paper:paper_00318884_v51_n2_p135_Sztrum2023-06-08T14:57:37Z Isocitrate lyase activity and antioxidant responses in copper-stressed cultures of Chlamydomonas reinhardtii (Volvocales, Chlorophyceae) Sztrum, Abelardo Andrés Sabatini, Sebastián Eduardo Rodriguez, María Cecilia Ascorbate peroxidase Catalase Chlamydomonas reinhardtii Copper Isocitrate lyase Lipid peroxidation Oxidative stress Chlamydomonadales Chlamydomonas reinhardtii Chlorophyceae Mastigophora (flagellates) The effect of copper-imposed oxidative stress on isocitrate lyase (ICL) activity was studied in a Chlamydomonas reinhardtii wild type and a copper-tolerant pleiotropic mutant strain. Suspension batch bioassays were performed adding copper chloride under moderate irradiation. Two harvest points were selected to represent the acute and restoration phases and oxidative stress indicators were measured: antioxidative metabolites, phenolic compounds, ascorbic acid, abundance of thiobarbituric reactive substances, and activities of detoxifying enzymes such as catalase and ascorbate peroxidase. Copper stress under moderate irradiance favours acetate assimilation through enhanced ICL activity, especially in the acute phase. Though the mutant strain exhibited at least twofold ICL activity in the acute phase compared to the wild type, there was no significant difference in copper tolerance between strains. The higher ICL activity under copper stress may be an adaptation to promote mixotrophic organic carbon assimilation when photosynthetic carbon dioxide fixation is impaired. Thus, the higher ICL activity has the potential to be a useful indicator in acetate-flagellate bioassays. Fil:Sztrum, A.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Sabatini, S.E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Rodríguez, M.C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2012 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00318884_v51_n2_p135_Sztrum http://hdl.handle.net/20.500.12110/paper_00318884_v51_n2_p135_Sztrum |
institution |
Universidad de Buenos Aires |
institution_str |
I-28 |
repository_str |
R-134 |
collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
topic |
Ascorbate peroxidase Catalase Chlamydomonas reinhardtii Copper Isocitrate lyase Lipid peroxidation Oxidative stress Chlamydomonadales Chlamydomonas reinhardtii Chlorophyceae Mastigophora (flagellates) |
spellingShingle |
Ascorbate peroxidase Catalase Chlamydomonas reinhardtii Copper Isocitrate lyase Lipid peroxidation Oxidative stress Chlamydomonadales Chlamydomonas reinhardtii Chlorophyceae Mastigophora (flagellates) Sztrum, Abelardo Andrés Sabatini, Sebastián Eduardo Rodriguez, María Cecilia Isocitrate lyase activity and antioxidant responses in copper-stressed cultures of Chlamydomonas reinhardtii (Volvocales, Chlorophyceae) |
topic_facet |
Ascorbate peroxidase Catalase Chlamydomonas reinhardtii Copper Isocitrate lyase Lipid peroxidation Oxidative stress Chlamydomonadales Chlamydomonas reinhardtii Chlorophyceae Mastigophora (flagellates) |
description |
The effect of copper-imposed oxidative stress on isocitrate lyase (ICL) activity was studied in a Chlamydomonas reinhardtii wild type and a copper-tolerant pleiotropic mutant strain. Suspension batch bioassays were performed adding copper chloride under moderate irradiation. Two harvest points were selected to represent the acute and restoration phases and oxidative stress indicators were measured: antioxidative metabolites, phenolic compounds, ascorbic acid, abundance of thiobarbituric reactive substances, and activities of detoxifying enzymes such as catalase and ascorbate peroxidase. Copper stress under moderate irradiance favours acetate assimilation through enhanced ICL activity, especially in the acute phase. Though the mutant strain exhibited at least twofold ICL activity in the acute phase compared to the wild type, there was no significant difference in copper tolerance between strains. The higher ICL activity under copper stress may be an adaptation to promote mixotrophic organic carbon assimilation when photosynthetic carbon dioxide fixation is impaired. Thus, the higher ICL activity has the potential to be a useful indicator in acetate-flagellate bioassays. |
author |
Sztrum, Abelardo Andrés Sabatini, Sebastián Eduardo Rodriguez, María Cecilia |
author_facet |
Sztrum, Abelardo Andrés Sabatini, Sebastián Eduardo Rodriguez, María Cecilia |
author_sort |
Sztrum, Abelardo Andrés |
title |
Isocitrate lyase activity and antioxidant responses in copper-stressed cultures of Chlamydomonas reinhardtii (Volvocales, Chlorophyceae) |
title_short |
Isocitrate lyase activity and antioxidant responses in copper-stressed cultures of Chlamydomonas reinhardtii (Volvocales, Chlorophyceae) |
title_full |
Isocitrate lyase activity and antioxidant responses in copper-stressed cultures of Chlamydomonas reinhardtii (Volvocales, Chlorophyceae) |
title_fullStr |
Isocitrate lyase activity and antioxidant responses in copper-stressed cultures of Chlamydomonas reinhardtii (Volvocales, Chlorophyceae) |
title_full_unstemmed |
Isocitrate lyase activity and antioxidant responses in copper-stressed cultures of Chlamydomonas reinhardtii (Volvocales, Chlorophyceae) |
title_sort |
isocitrate lyase activity and antioxidant responses in copper-stressed cultures of chlamydomonas reinhardtii (volvocales, chlorophyceae) |
publishDate |
2012 |
url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00318884_v51_n2_p135_Sztrum http://hdl.handle.net/20.500.12110/paper_00318884_v51_n2_p135_Sztrum |
work_keys_str_mv |
AT sztrumabelardoandres isocitratelyaseactivityandantioxidantresponsesincopperstressedculturesofchlamydomonasreinhardtiivolvocaleschlorophyceae AT sabatinisebastianeduardo isocitratelyaseactivityandantioxidantresponsesincopperstressedculturesofchlamydomonasreinhardtiivolvocaleschlorophyceae AT rodriguezmariacecilia isocitratelyaseactivityandantioxidantresponsesincopperstressedculturesofchlamydomonasreinhardtiivolvocaleschlorophyceae |
_version_ |
1768541646586118144 |