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Related Concept Videos

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Amino Acid Biosynthetic Pathways

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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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Vitamins, derived from the Latin word for life, are essential organic substances required in small quantities for optimal growth and overall well-being. Unlike other organic nutrients, vitamins don't act as sources of energy or building materials but rather facilitate these nutrients' utilization by the body. Vitamins are predominantly coenzymes, assisting enzymes in specific chemical actions, like the oxidation of glucose for energy involving B vitamins. Most vitamins are not produced...
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Nucleic acid biosynthesis is a fundamental biochemical process that produces the purine and pyrimidine nucleotides essential for DNA and RNA synthesis. This pathway maintains a balanced nucleotide pool, preventing imbalances that could jeopardize genetic integrity and cellular function. Given the crucial role of nucleotides, their synthesis is tightly regulated to ensure proper cellular homeostasis.Purine BiosynthesisThe biosynthesis of purine nucleotides begins with ribose-5-phosphate, a...
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Biosynthesis in bacteria is a fundamental anabolic process that generates essential macromolecules, including proteins, nucleic acids, lipids, and polysaccharides. These macromolecules are critical for cellular growth, replication, and function. The process is tightly regulated and energetically linked to catabolic pathways to ensure optimal resource utilization.Biosynthetic pathways begin with precursor metabolites such as pyruvate, acetyl-CoA, and glucose-6-phosphate derived from glycolysis,...
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Microorganisms rely on proteins as an essential carbon and energy source, particularly in environments with limited polysaccharides or lipids. However, proteins are too large to cross the plasma membrane unaided, necessitating enzymatic degradation. Microbes secrete extracellular proteases and peptidases that hydrolyze proteins into peptides, which can then be transported across the membrane. Once inside the cell, intracellular proteases degrade these peptides into free amino acids, which...
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Proteins are broken down into amino acids during digestion. Unlike fats and carbohydrates, which are stored for later use, proteins are not. Instead, amino acids are either used to produce ATP through oxidation or contribute to the creation of new proteins for the growth and repair of the body. Any surplus amino acids from the diet are converted into glucose or triglycerides rather than excreted.
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Plant amino acid-derived vitamins: biosynthesis and function.

Javier A Miret1, Sergi Munné-Bosch

  • 1Departament de Biologia Vegetal, Facultat de Biologia, Universitat de Barcelona, Avinguda Diagonal 643, 08028, Barcelona, Spain.

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Plants synthesize essential vitamins (B vitamins and E) from amino acids, crucial for human health. Understanding plant vitamin biosynthesis can improve crop nutritional quality and human diets.

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Area of Science:

  • Plant Biochemistry
  • Nutritional Science
  • Metabolic Engineering

Background:

  • Vitamins are essential organic compounds humans cannot synthesize, requiring dietary intake primarily from plants.
  • Plant-derived vitamins, particularly B vitamins and E, originate from amino acid precursors, linking them to nitrogen metabolism.
  • Natural variations in crop vitamin content offer opportunities for enhancement.

Purpose of the Study:

  • To review the biosynthesis of amino acid-derived vitamins in plants.
  • To explore strategies for increasing vitamin content in crops using this knowledge.
  • To compare the functions of these vitamins in plants and animals, highlighting common and distinct roles.

Main Methods:

  • Literature review of plant vitamin biosynthesis pathways.
  • Analysis of metabolic engineering and breeding strategies for vitamin enhancement.
  • Comparative analysis of vitamin functions in plants and animals.

Main Results:

  • Amino acids serve as precursors and donors in the synthesis of vitamins B1, B2, B3, B5, B7, B9, and E in plants.
  • Plant breeding, metabolic engineering, and agronomic practices can significantly increase vitamin levels in crops.
  • While core biochemical roles are conserved, vitamin B and E functions show distinct physiological impacts in plants versus animals.

Conclusions:

  • Elucidating plant vitamin biosynthesis pathways is key to improving crop nutritional value.
  • Targeting amino acid-derived vitamin synthesis in plants offers a viable strategy for enhancing human nutrition.
  • Comparative studies reveal conserved and divergent roles of essential vitamins across kingdoms.