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Amino acid biosynthesis is essential for cell growth, protein synthesis, and metabolic regulation. Cells generate essential and non-essential amino acids from metabolic intermediates to sustain vital biological functions. These intermediates originate from key metabolic pathways: glycolysis, the tricarboxylic acid (TCA) cycle, and the pentose phosphate pathway. Important precursors include α-ketoglutarate, pyruvate, oxaloacetate, phosphoenolpyruvate, and erythrose-4-phosphate, which...
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Triglycerides serve as crucial long-term energy storage molecules in microorganisms, providing a dense source of metabolic energy. Their breakdown is mediated by lipases, which hydrolyze triglycerides into glycerol and free fatty acids. Each of these components follows distinct metabolic pathways, ultimately contributing to ATP synthesis and cellular energy homeostasis.Glycerol MetabolismGlycerol, released from triglyceride hydrolysis, is phosphorylated by glycerol kinase to form...
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Cellular respiration is a fundamental metabolic process that enables organisms to generate energy from organic molecules. One of its central pathways is the tricarboxylic acid (TCA) cycle, also known as the Krebs cycle, which plays a crucial role in energy production and biosynthetic processes.Conversion of Pyruvate to Acetyl-CoAThe pyruvate generated from glycolysis undergoes oxidative decarboxylation by the pyruvate dehydrogenase complex, producing acetyl-CoA, one molecule of NADH, and one...
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Related Experiment Video

Updated: Dec 12, 2025

Identification of Novel Regulators of Plant Transpiration by Large-Scale Thermal Imaging Screening in Helianthus Annuus
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Abscisic acid biosynthesis and catabolism.

Eiji Nambara1, Annie Marion-Poll

  • 1Laboratory for Reproductive Growth Regulation, Plant Science Center, RIKEN, Yokohama, 230-0045, Japan. nambara@postman.riken.go.jp

Annual Review of Plant Biology
|May 3, 2005
PubMed
Summary

Understanding plant growth requires identifying genes for abscisic acid (ABA) metabolism. Research highlights CYP707A genes as key ABA catabolic enzymes, crucial for regulating hormone levels.

Area of Science:

  • Plant Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Abscisic acid (ABA) is a vital plant hormone regulating growth and development.
  • Plant ABA levels are controlled by biosynthesis and catabolism.
  • Identifying ABA metabolic genes is essential for understanding hormone regulation.

Purpose of the Study:

  • To identify genes involved in abscisic acid (ABA) metabolism, particularly catabolism.
  • To understand how ABA metabolism is regulated to fine-tune hormone levels.

Main Methods:

  • Genomic approaches were used to identify ABA catabolic genes.
  • Focus on Arabidopsis CYP707A genes encoding ABA 8'-hydroxylases.

Main Results:

  • Arabidopsis CYP707A genes catalyze the primary step in ABA catabolism.

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  • Multiple metabolic steps in ABA metabolism are differentially regulated.
  • Regulation occurs at both transcriptional and post-transcriptional levels.

    • Conclusions:

    • CYP707A genes are critical for ABA catabolism in plants.
    • Differential regulation of ABA metabolic genes fine-tunes hormone levels.
    • Ongoing research provides new insights into ABA metabolism and its physiological roles.