Photosynthesis, respiration and growth: A carbon and energy balancing act for alternative oxidase

Vanlerberghe, Greg C.; Dahal, Keshav; Alber, Nicole A.; Chadee, Avesh

doi:10.1016/j.mito.2020.04.001

Cited by 101 publications

(105 citation statements)

References 184 publications

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“…In return, the autotroph legumes (macrosymbionts) provide the heterotrophic Rhizobium bacteroids (microsymbionts) with organic carbon for respiration derived from photosynthetic reactions (Mitsch et al, 2018;Flores-Tinoco et al, 2020). Therefore, the root nodule is the point of convergence of two very important reactions namely, biological nitrogen fixation through nitrogenase machinery (Lindström and Mousavi, 2019;Signorelli et al, 2020), and carbon fixation in the photosynthetic machinery (Pinnola and Bassi, 2018;Vanlerberghe et al, 2020) (Figure 1). The union of Rhizobium and leguminous plants through nitrogen-fixing root nodules is an efficient nutrient cycling component in biogeochemical cycles of various ecosystems.…”

Section: Introductionmentioning

confidence: 99%

Rhizobium-Linked Nutritional and Phytochemical Changes Under Multitrophic Functional Contexts in Sustainable Food Systems

Ochieno

Karoney

Muge

et al. 2021

Front. Sustain. Food Syst.

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Rhizobia are bacteria that exhibit both endophytic and free-living lifestyles. Endophytic rhizobial strains are widely known to infect leguminous host plants, while some do infect non-legumes. Infection of leguminous roots often results in the formation of root nodules. Associations between rhizobia and host plants may result in beneficial or non-beneficial effects. Such effects are linked to various biochemical changes that have far-reaching implications on relationships between host plants and the dependent multitrophic biodiversity. This paper explores relationships that exist between rhizobia and various plant species. Emphasis is on nutritional and phytochemical changes that occur in rhizobial host plants, and how such changes affect diverse consumers at different trophic levels. The purpose of this paper is to bring into context various aspects of such interactions that could improve knowledge on the application of rhizobia in different fields. The relevance of rhizobia in sustainable food systems is addressed in context.

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Section: Introductionmentioning

confidence: 99%

Rhizobium-Linked Nutritional and Phytochemical Changes Under Multitrophic Functional Contexts in Sustainable Food Systems

Ochieno

Karoney

Muge

et al. 2021

Front. Sustain. Food Syst.

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“…The mitochondrion is a metabolic hub, not only for energy metabolism—the tricarboxylic acid (TCA) cycle and oxidative phosphorylation—but also for the biosynthesis of coenzymes, amino acids, some fatty acids, and lipids [ 2 , 3 ]. In photosynthetic cells in the light, there is a massive flow of fixed carbon from the chloroplasts to the rest of the cell, especially to the mitochondria via the cytosol, but metabolic cooperation between plastids and mitochondria also takes place in darkness [ 4 , 5 ]. Retrograde signaling from the mitochondria to the nucleus probably involves export of peptides [ 6 , 7 ].…”

Section: Introductionmentioning

confidence: 99%

Proteomic and Bioinformatic Profiling of Transporters in Higher Plant Mitochondria

et al. 2020

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To function as a metabolic hub, plant mitochondria have to exchange a wide variety of metabolic intermediates as well as inorganic ions with the cytosol. As identified by proteomic profiling or as predicted by MU-LOC, a newly developed bioinformatics tool, Arabidopsis thaliana mitochondria contain 128 or 143 different transporters, respectively. The largest group is the mitochondrial carrier family, which consists of symporters and antiporters catalyzing secondary active transport of organic acids, amino acids, and nucleotides across the inner mitochondrial membrane. An impressive 97% (58 out of 60) of all the known mitochondrial carrier family members in Arabidopsis have been experimentally identified in isolated mitochondria. In addition to many other secondary transporters, Arabidopsis mitochondria contain the ATP synthase transporters, the mitochondria protein translocase complexes (responsible for protein uptake across the outer and inner membrane), ATP-binding cassette (ABC) transporters, and a number of transporters and channels responsible for allowing water and inorganic ions to move across the inner membrane driven by their transmembrane electrochemical gradient. A few mitochondrial transporters are tissue-specific, development-specific, or stress-response specific, but this is a relatively unexplored area in proteomics that merits much more attention.

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“…In many organisms, AOX is not expressed under standard growth conditions. However, a number of factors that affect mitochondrial function induce transcription of AOX genes and the synthesis of the enzyme [ 10 , 13 , 14 , 15 , 16 , 17 ]. Since expression of the nuclear encoded AOX responds to changes in mitochondrial function, it serves as a robust model for the study of retrograde regulation.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Single Gene Deletion Mutants Affecting Alternative Oxidase Production in Neurospora crassa: Role of the yvh1 Gene

Kishore

Kelly

et al. 2020

Microorganisms

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The Neurospora crassa AOD1 protein is a mitochondrial alternative oxidase that passes electrons directly from ubiquinol to oxygen. The enzyme is encoded by the nuclear aod-1 gene and is produced when the standard electron transport chain is inhibited. We previously identified eleven strains in the N. crassa single gene deletion library that were severely deficient in their ability to produce AOD1 when grown in the presence of chloramphenicol, an inhibitor of mitochondrial translation that is known to induce the enzyme. Three mutants affected previously characterized genes. In this report we examined the remaining mutants and found that the deficiency of AOD1 was due to secondary mutations in all but two of the strains. One of the authentic mutants contained a deletion of the yvh1 gene and was found to have a deficiency of aod-1 transcripts. The YVH1 protein localized to the nucleus and a post mitochondrial pellet from the cytoplasm. A zinc binding domain in the protein was required for rescue of the AOD1 deficiency. In other organisms YVH1 is required for ribosome assembly and mutants have multiple phenotypes. Lack of YVH1 in N. crassa likely also affects ribosome assembly leading to phenotypes that include altered regulation of AOD1 production.

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Photosynthesis, respiration and growth: A carbon and energy balancing act for alternative oxidase

Cited by 101 publications

References 184 publications

Rhizobium-Linked Nutritional and Phytochemical Changes Under Multitrophic Functional Contexts in Sustainable Food Systems

Rhizobium-Linked Nutritional and Phytochemical Changes Under Multitrophic Functional Contexts in Sustainable Food Systems

Proteomic and Bioinformatic Profiling of Transporters in Higher Plant Mitochondria

Characterization of Single Gene Deletion Mutants Affecting Alternative Oxidase Production in Neurospora crassa: Role of the yvh1 Gene

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