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Amino Acid Biosynthetic Pathways01:29

Amino Acid Biosynthetic Pathways

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 provide...
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Quantification of Bacterial Histidine Kinase Autophosphorylation Using a Nitrocellulose Binding Assay
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Published on: January 11, 2017

Histidine biosynthesis.

Robert A Ingle1

  • 1Department of Molecular and Cell Biology, University of Cape Town, Rondebosch 7701, South Africa.

The Arabidopsis Book
|February 4, 2012
PubMed
Summary
This summary is machine-generated.

Histidine biosynthesis in plants is crucial for growth but poorly understood. Recent enzyme identification in Arabidopsis reveals potential regulatory roles, yet transcriptional control and metabolic balancing remain unclear.

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Area of Science:

  • Biochemistry
  • Plant Physiology
  • Molecular Biology

Background:

  • Histidine (His) is an essential amino acid in proteins, vital for plant growth and development due to its catalytic and metal-binding imidazole side group.
  • His biosynthesis is well-studied in microorganisms but comparatively neglected in plants, despite its fundamental biological importance.
  • All enzymes in the His biosynthesis pathway are now identified in Arabidopsis, with ATP-phosphoribosyl transferase implicated in pathway regulation.

Purpose of the Study:

  • To investigate the current understanding of histidine biosynthesis and its regulation in plants.
  • To highlight the gaps in knowledge regarding transcriptional regulation and metabolic integration of histidine synthesis.
  • To identify the need for further research into histidine catabolism in plants.

Main Methods:

  • Literature review of existing research on histidine biosynthesis in plants and microorganisms.
  • Analysis of identified enzymes and their proposed regulatory roles, particularly ATP-phosphoribosyl transferase.
  • Identification of knowledge gaps concerning gene expression and metabolic balancing.

Main Results:

  • All enzymes for histidine biosynthesis have been identified in Arabidopsis.
  • ATP-phosphoribosyl transferase is suggested as a key regulatory enzyme in the pathway.
  • Significant gaps exist in understanding the transcriptional regulation and metabolic integration of histidine biosynthesis in plants.

Conclusions:

  • While the enzymatic machinery for histidine biosynthesis is elucidated in plants like Arabidopsis, its transcriptional regulation and integration into overall plant metabolism require further investigation.
  • The pathway of histidine catabolism in plants remains largely undetermined.
  • Future research should focus on the regulatory mechanisms controlling histidine synthesis and degradation to fully understand its role in plant physiology.