AtNDB2 Is the Main External NADH Dehydrogenase in Mitochondria and Is Important for Tolerance to Environmental Stress
In addition to the classical electron transport pathway coupled to ATP synthesis, plant mitochondria have an alternative pathway that involves type II NAD(P)H dehydrogenases (NDs) and alternative oxidase (AOX). This alternative pathway participates in thermogenesis in select organs of some species a...
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Published in | Plant physiology (Bethesda) Vol. 181; no. 2; pp. 774 - 788 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
United States
01.10.2019
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Subjects | |
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Abstract | In addition to the classical electron transport pathway coupled to ATP synthesis, plant mitochondria have an alternative pathway that involves type II NAD(P)H dehydrogenases (NDs) and alternative oxidase (AOX). This alternative pathway participates in thermogenesis in select organs of some species and is thought to help prevent cellular damage during exposure to environmental stress. Here, we investigated the function and role of one alternative path component, AtNDB2, using a transgenic approach in Arabidopsis (
). Disruption of
expression via T-DNA insertion led to a 90% decrease of external NADH oxidation in isolated mitochondria. Overexpression of
led to increased AtNDB2 protein abundance in mitochondria but did not enhance external NADH oxidation significantly unless
was concomitantly overexpressed and activated, demonstrating a functional link between these enzymes. Plants lacking either
or
were more sensitive to combined drought and elevated light treatments, whereas plants overexpressing these components showed increased tolerance and capacity for poststress recovery. We conclude that AtNDB2 is the predominant external NADH dehydrogenase in mitochondria and together with AtAOX1A forms a complete, functional, nonphosphorylating pathway of electron transport, whose operation enhances tolerance to environmental stress. This study demonstrates that at least one of the alternative NDs, as well as AOX, are important for the stress response. |
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AbstractList | In addition to the classical electron transport pathway coupled to ATP synthesis, plant mitochondria have an alternative pathway that involves type II NAD(P)H dehydrogenases (NDs) and alternative oxidase (AOX). This alternative pathway participates in thermogenesis in select organs of some species and is thought to help prevent cellular damage during exposure to environmental stress. Here, we investigated the function and role of one alternative path component, AtNDB2, using a transgenic approach in Arabidopsis (Arabidopsis thaliana). Disruption of AtNDB2 expression via T-DNA insertion led to a 90% decrease of external NADH oxidation in isolated mitochondria. Overexpression of AtNDB2 led to increased AtNDB2 protein abundance in mitochondria but did not enhance external NADH oxidation significantly unless AtAOX1A was concomitantly overexpressed and activated, demonstrating a functional link between these enzymes. Plants lacking either AtAOX1A or AtNDB2 were more sensitive to combined drought and elevated light treatments, whereas plants overexpressing these components showed increased tolerance and capacity for poststress recovery. We conclude that AtNDB2 is the predominant external NADH dehydrogenase in mitochondria and together with AtAOX1A forms a complete, functional, nonphosphorylating pathway of electron transport, whose operation enhances tolerance to environmental stress. This study demonstrates that at least one of the alternative NDs, as well as AOX, are important for the stress response.In addition to the classical electron transport pathway coupled to ATP synthesis, plant mitochondria have an alternative pathway that involves type II NAD(P)H dehydrogenases (NDs) and alternative oxidase (AOX). This alternative pathway participates in thermogenesis in select organs of some species and is thought to help prevent cellular damage during exposure to environmental stress. Here, we investigated the function and role of one alternative path component, AtNDB2, using a transgenic approach in Arabidopsis (Arabidopsis thaliana). Disruption of AtNDB2 expression via T-DNA insertion led to a 90% decrease of external NADH oxidation in isolated mitochondria. Overexpression of AtNDB2 led to increased AtNDB2 protein abundance in mitochondria but did not enhance external NADH oxidation significantly unless AtAOX1A was concomitantly overexpressed and activated, demonstrating a functional link between these enzymes. Plants lacking either AtAOX1A or AtNDB2 were more sensitive to combined drought and elevated light treatments, whereas plants overexpressing these components showed increased tolerance and capacity for poststress recovery. We conclude that AtNDB2 is the predominant external NADH dehydrogenase in mitochondria and together with AtAOX1A forms a complete, functional, nonphosphorylating pathway of electron transport, whose operation enhances tolerance to environmental stress. This study demonstrates that at least one of the alternative NDs, as well as AOX, are important for the stress response. In addition to the classical electron transport pathway coupled to ATP synthesis, plant mitochondria have an alternative pathway that involves type II NAD(P)H dehydrogenases (NDs) and alternative oxidase (AOX). This alternative pathway participates in thermogenesis in select organs of some species and is thought to help prevent cellular damage during exposure to environmental stress. Here, we investigated the function and role of one alternative path component, AtNDB2, using a transgenic approach in Arabidopsis ( ). Disruption of expression via T-DNA insertion led to a 90% decrease of external NADH oxidation in isolated mitochondria. Overexpression of led to increased AtNDB2 protein abundance in mitochondria but did not enhance external NADH oxidation significantly unless was concomitantly overexpressed and activated, demonstrating a functional link between these enzymes. Plants lacking either or were more sensitive to combined drought and elevated light treatments, whereas plants overexpressing these components showed increased tolerance and capacity for poststress recovery. We conclude that AtNDB2 is the predominant external NADH dehydrogenase in mitochondria and together with AtAOX1A forms a complete, functional, nonphosphorylating pathway of electron transport, whose operation enhances tolerance to environmental stress. This study demonstrates that at least one of the alternative NDs, as well as AOX, are important for the stress response. |
Author | Waterman, Christopher D Day, David A Smith, Penelope M C Sweetman, Crystal Rainbird, Barry M Soole, Kathleen L Jenkins, Colin D |
Author_xml | – sequence: 1 givenname: Crystal surname: Sweetman fullname: Sweetman, Crystal organization: College of Science and Engineering, Flinders University of South Australia, Adelaide, South Australia 5042, Australia – sequence: 2 givenname: Christopher D orcidid: 0000-0002-7270-5689 surname: Waterman fullname: Waterman, Christopher D organization: College of Science and Engineering, Flinders University of South Australia, Adelaide, South Australia 5042, Australia – sequence: 3 givenname: Barry M surname: Rainbird fullname: Rainbird, Barry M organization: College of Science and Engineering, Flinders University of South Australia, Adelaide, South Australia 5042, Australia – sequence: 4 givenname: Penelope M C orcidid: 0000-0001-9841-1112 surname: Smith fullname: Smith, Penelope M C organization: Department of Animal, Plant, and Soil Sciences, School of Life Sciences, Latrobe University, Bundoora, Victoria 3083, Australia – sequence: 5 givenname: Colin D orcidid: 0000-0002-9347-8948 surname: Jenkins fullname: Jenkins, Colin D organization: College of Science and Engineering, Flinders University of South Australia, Adelaide, South Australia 5042, Australia – sequence: 6 givenname: David A orcidid: 0000-0001-7967-2173 surname: Day fullname: Day, David A email: david.day@flinders.edu.au organization: College of Science and Engineering, Flinders University of South Australia, Adelaide, South Australia 5042, Australia david.day@flinders.edu.au – sequence: 7 givenname: Kathleen L surname: Soole fullname: Soole, Kathleen L organization: College of Science and Engineering, Flinders University of South Australia, Adelaide, South Australia 5042, Australia |
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SubjectTerms | Arabidopsis - enzymology Arabidopsis - genetics Arabidopsis - growth & development Cell Respiration Mitochondria - enzymology Mitochondrial Proteins - genetics Mitochondrial Proteins - metabolism NADH Dehydrogenase - genetics NADH Dehydrogenase - metabolism Oxidoreductases - genetics Oxidoreductases - metabolism Plant Proteins - genetics Plant Proteins - metabolism Plants, Genetically Modified Stress, Physiological |
Title | AtNDB2 Is the Main External NADH Dehydrogenase in Mitochondria and Is Important for Tolerance to Environmental Stress |
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