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Amino Acid Biosynthetic Pathways01:29

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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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Cellular needs and conditions vary from cell to cell and change within individual cells over time. For example, the required enzymes and energetic demands of stomach cells are different from those of fat storage cells, skin cells, blood cells, and nerve cells. Furthermore, a digestive cell works much harder to process and break down nutrients during the time that closely follows a meal compared with many hours after a meal. As these cellular demands and conditions vary, so do the amounts and...
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Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
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Proline metabolism as regulatory hub.

María E Alvarez1, Arnould Savouré2, László Szabados3

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Plants accumulate proline, an amino acid, under stress. This review highlights proline

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Area of Science:

  • Plant Physiology
  • Biochemistry
  • Stress Biology

Background:

  • Proline is an amino acid.
  • Proline accumulates in plants under stress.
  • Proline is linked to cellular processes.

Purpose of the Study:

  • Review proline metabolism and function.
  • Inform about proline's role in homeostasis, development, and stress.
  • Highlight findings from the last decade.

Main Methods:

  • Literature review.
  • Analysis of proline metabolism.
  • Synthesis of proline function.

Main Results:

  • Proline accumulation is linked to osmotic pressure, energy status, nutrient availability, redox balance, and pathogen defense.
  • Proline biosynthesis connects to photosynthesis; catabolism connects to mitochondrial respiration.
  • Proline acts as a signaling molecule, influencing gene expression and metabolism.

Conclusions:

  • Proline is crucial for maintaining cellular homeostasis.
  • Proline modulates plant development.
  • Proline enhances plant stress acclimation.