Light Regulation of Tricarboxylic Acid Cycle Isoenzymes in Plants

Light regulation of the tricarboxylic acid cycle (TCA) in green plant leaves is carried out by active forms of phytochrome and cryptochrome as well as other mechanisms that exhibit an inhibitory effect on the activity of a number of mitochondrial isoenzymes. Phytochrome signal transduction into the...

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Bibliographic Details
Published in:Russian journal of plant physiology 2022-12, Vol.69 (6), Article 110
Main Authors: Fedorin, D. N., Eprintsev, A. T., Igamberdiev, A. U.
Format: Article
Language:English
Subjects:
Aconitate hydratase
Biomedical and Life Sciences
Calcium ions
Calcium sequestration
Cations
Citrate synthase
CpG islands
Dehydrogenase
Dehydrogenases
Epigenetics
Fumarase
Gene expression
Genes
Isoenzymes
Ketoglutaric acid
Kinases
Leaves
Life Sciences
Malate dehydrogenase
Mitochondria
Oxoglutarate dehydrogenase (lipoamide)
Plant Physiology
Plant Sciences
Plants
Promoters
Reviews
Signal transduction
Succinate dehydrogenase
Tricarboxylic acid cycle
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Summary:Light regulation of the tricarboxylic acid cycle (TCA) in green plant leaves is carried out by active forms of phytochrome and cryptochrome as well as other mechanisms that exhibit an inhibitory effect on the activity of a number of mitochondrial isoenzymes. Phytochrome signal transduction into the cell nucleus is carried out by redistribution of free calcium cations between cell compartments, which leads to the activation of calmodulins. Interacting with Ca 2+ -cam-dependent kinase, calmodulins provide control over the functioning of the transcription factor PIF3, which regulates the expression of genes for isoenzymes of 2-oxoglutarate dehydrogenase, succinate dehydrogenase, aconitate hydratase, malate dehydrogenase, fumarate hydratase, and citrate synthase in green leaves of plants, thus controlling the rate of functioning of the TCA. The high methyl status of the promoters of the genes encoding these enzymes leads to the suppression of their transcription, which suggests an epigenetic mechanism for light regulation of their expression. Changes in the methyl status of individual CG dinucleotides in the CpG islands of gene promoters regulate their functioning in plant leaves under different lighting conditions.
ISSN:1021-4437
1608-3407
DOI:10.1134/S1021443722060048