Cited by 88Mitochondrial Function and PathologyPhotosynthetic Processes and MechanismsPlant nutrient uptake and metabolism

Involvement of cyanide‐resistant and rotenone‐insensitive pathways of mitochondrial electron transport during oxidation of glycine in higher plants

Igamberdiev, Abir U, Bykova, Natalia V, Gardeström, Per·1997·FEBS Letters

Abstract

Metabolism of glycine in isolated mitochondria and protoplasts was investigated in photosynthetic, etiolated (barley and pea leaves) and fat-storing (maize scutellum) tissues using methods of [1-(14)C]glycine incorporation and counting of 14CO2 evolved, oxymetric measurement of glycine oxidation and rapid fractionation of protoplasts incubated in photorespiratory conditions with consequent determination of ATP/ADP ratios in different cell compartments. The involvement of different paths of electron transport in mitochondria during operation of glycine decarboxylase complex (GDC) was tested in different conditions, using aminoacetonitrile (AAN), the inhibitor of glycine oxidation in mitochondria, rotenone, the inhibitor of Complex I of mitochondrial electron transport, and inhibitors of cytochrome oxidase and alternative oxidase. It was shown that glycine has a preference to other substrates oxidized in mitochondria only in photosynthetic tissue where succinate and malate even stimulated its oxidation. Rotenone had no or small effect on glycine oxidation, whereas the role of cyanide-resistant path increased in the presence of ATP. Glycine oxidation increased ATP/ADP ratio in cytosol of barley protoplasts incubated in the presence of CO2, but not in the CO2-free medium indicating that in conditions of high photorespiratory flux oxidation of NADH formed in the GDC reaction passes via the non-coupled paths. Activity of GDC in fat-storing tissue correlated with the activity of gly…

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Crossref · 10.1016/s0014-5793(97)00756-4

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  • The rate of NADH generation by Gly oxidation in C3 plants can exceed the capacity at which it can be oxidized in the cytochrome branch of the respiratory chain, and this triggers NADH oxidation via the uncoupled alternative respiratory chain.

    “the rate of NADH generation by Gly oxidation in C3 plants can exceed the capacity at which it can be oxidized in the cytochrome branch of the respiratory chain, and this triggers NADH oxidation via the uncoupled alternative respiratory chain (Igamberdiev et al., 1997).”

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Authors
Igamberdiev, A. U., Bykova, N. V., & Gardeström, P.
Affiliations
  • Voronezh State University (RU)
  • Umeå University (SE)
Venue
FEBS Letters
Publisher
Wiley
Published
1997-07-28
Volume
412
Issue
2
Pages
265-269
ISSN
  • 0014-5793 (ISSN-L)
  • 1873-3468
OpenAlex
W2014966417
Cited by
88
References
26
Citations by year
2026: 2 · 2024: 1 · 2022: 1 · 2021: 1 · 2020: 4 · 2019: 2 · 2018: 3 · 2017: 3 · 2016: 8 · 2015: 3 · 2014: 6 · 2013: 3 · 2012: 1
FWCI
1.30
Type
journal article
Language
en
Open access
closed
Locations
  • FEBS Letters (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Photosynthetic Processes and Mechanisms
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Plant nutrient uptake and metabolism
Keywords
glycine oxidation, mitochondrial electron transport chain, alternative oxidase, cytochrome c oxidase, NADH oxidation, photorespiration, ATP/ADP ratio, succinic acid, malate, glyoxylate cycle, photosynthetic tissues, barley, pea, aminoacetonitrile
MeSH terms
Adenosine Diphosphate, Adenosine Triphosphate, Amino Acid Oxidoreductases, Cyanides, Electron Transport, Glycine, Mitochondria, Oxidation-Reduction, Oxygen, Plants, Rotenone, Plant Leaves, Glycine Dehydrogenase (Decarboxylating), Glycine Decarboxylase Complex

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