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Global regulatory systems in bacteria enable rapid and coordinated responses to environmental changes by integrating sensory inputs with gene expression, ensuring efficient adaptation to fluctuating conditions. Key global regulatory mechanisms include regulons, two-component systems, sigma factors, and secondary messengers.Regulons and Global RegulatorsA regulon is a collection of genes and operons controlled by a common global regulator. These regulators enable bacteria to prioritize resource...
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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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Carbon dioxide fixation in prokaryotes enables the assimilation of inorganic carbon into organic molecules, supporting biosynthetic pathways, sustaining ecosystems, and contributing to the global carbon cycle. It also has industrial applications in carbon capture and bioproduct synthesis. Autotrophic organisms rely on this process to utilize CO₂ as a carbon source in diverse environments.The Calvin CycleThe Calvin cycle is the most widespread carbon fixation mechanism, primarily used by...
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Metabolic Pathway Confirmation and Discovery Through 13C-labeling of Proteinogenic Amino Acids
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Carbon metabolite sensing and signalling.

Nigel G Halford1, Matthew J Paul

  • 1Crop Performance and Improvement, Rothamsted Research, Harpenden, Hertfordshire AL5 2JQ, UK. nigel.halford@bbsrc.ac.uk

Plant Biotechnology Journal
|December 1, 2006
PubMed
Summary

Plants sense and signal carbon metabolism using a complex network of molecules and pathways. Understanding this system is key to improving crop yields and plant development.

Area of Science:

  • Plant Physiology
  • Molecular Biology
  • Biochemistry

Background:

  • Plant carbon metabolism regulation is sensitive to available carbon metabolites.
  • Sensing and signaling involve a complex network of metabolites, transporters, enzymes, transcription factors, and hormones.
  • Key candidate metabolites include sucrose, glucose, hexoses, glucose-6-phosphate, trehalose-6-phosphate, trehalose, and adenosine monophosphate.

Purpose of the Study:

  • To review current knowledge on carbon metabolite sensing and signaling in plants.
  • To compare plant systems with homologous systems in animals and fungi.
  • To explore cross-talk with other signaling pathways and prospects for crop improvement.

Main Methods:

  • Review of existing literature on plant carbon metabolism sensing and signaling.

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  • Comparative analysis of plant, animal, and fungal systems.
  • Examination of evidence for signaling pathway cross-talk.

    • Main Results:

    • Identified key components of plant carbon sensing and signaling, including SnRK1 and hexokinase.
    • Highlighted the broad impact of these pathways on gene expression, enzyme activity, and developmental processes.
    • Discussed potential for manipulating these pathways for agricultural benefits.

    Conclusions:

    • Carbon metabolite sensing and signaling are crucial for plant growth and development.
    • Understanding these pathways offers opportunities for enhancing crop performance.
    • Further research into cross-talk and manipulation holds significant promise for plant science.