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Related Concept Videos

Repressible Operon: trp Operon01:21

Repressible Operon: trp Operon

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The trp operon in Escherichia coli exemplifies a repressible operon. It regulates the synthesis of tryptophan through repressor-mediated transcriptional control and attenuation. This dual regulatory mechanism ensures tryptophan biosynthesis occurs only when needed, conserving cellular resources.Structure of the trp OperonThe trp operon consists of five structural genes (trpE, trpD, trpC, trpB, and trpA) that encode enzymes for tryptophan biosynthesis. These genes are transcribed as a single...
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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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Transcription Attenuation in Prokaryotes02:42

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Transcriptional attenuation occurs when RNA transcription is prematurely terminated due to the formation of a terminator mRNA hairpin structure.  Bacteria use these hairpins to regulate the transcription process and control the synthesis of several amino acids including histidine, lysine, threonine, and phenylalanine. Transcription attenuation takes place in the non-coding regions of mRNA.
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Acute Respiratory Failure-IV01:23

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Respiratory failure can manifest suddenly or gradually, characterized by a rapid decline in PaO2 and a rapid rise in PaCO2. This situation indicates a severe respiratory problem that may quickly become a life-threatening emergency. One of the early signs of hypoxemic Acute Respiratory Failure (ARF) is a change in mental status due to the brain's sensitivity to oxygen levels and changes in acid-base balance. Symptoms such as restlessness, confusion, and agitation suggest inadequate oxygen...
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Antidepressant Drugs: Tricyclics, SSRIs, and SNRIs01:28

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Tricyclic Antidepressants (TCAs), including Desipramine (Norpramin), Imipramine (Tofranil), Clomipramine (Anafranil), and Amitriptyline (Elavil), inhibit serotonin and norepinephrine reuptake and also block other receptors. They are used for depression, pain conditions, and insomnia. Common adverse effects include anticholinergic effects, sedation, orthostatic hypotension, and weight gain. They have a narrow therapeutic window and so require plasma-level monitoring. Abrupt discontinuation can...
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Acute Respiratory Failure-V01:29

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The treatment for acute respiratory failure varies based on factors like the underlying cause, overall health, and severity. A collaborative healthcare team is essential for early detection, often through arterial blood gas analysis. Identifying the cause is the primary goal, with treatment strategies adjusted for ventilation/perfusion (V/Q) mismatch, shunting, or diffusion impairment.
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Related Experiment Video

Updated: Oct 13, 2025

Radiosynthesis of 1-2-[18F]Fluoroethyl-L-Tryptophan using a One-pot, Two-step Protocol
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Tryptophan: A Unique Role in the Critically Ill.

Marcela Kanova1,2, Pavel Kohout3

  • 1Department of Anaesthesiology and Intensive Care Medicine, University Hospital Ostrava, 708 52 Ostrava, Czech Republic.

International Journal of Molecular Sciences
|November 13, 2021
PubMed
Summary

Tryptophan metabolism, via serotonin and kynurenine pathways, impacts critical illness, inflammation, and sepsis. Modulating these pathways may treat chronic inflammation and post-intensive care syndrome.

Keywords:
deliriuminflammationkynurenine pathwaypolyneuromyopathypost intensive care syndromerapamycinsepsisserotonin pathwaytryptophan metabolism

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PCR Mutagenesis, Cloning, Expression, Fast Protein Purification Protocols and Crystallization of the Wild Type and Mutant Forms of Tryptophan Synthase
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Related Experiment Videos

Last Updated: Oct 13, 2025

Radiosynthesis of 1-2-[18F]Fluoroethyl-L-Tryptophan using a One-pot, Two-step Protocol
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PCR Mutagenesis, Cloning, Expression, Fast Protein Purification Protocols and Crystallization of the Wild Type and Mutant Forms of Tryptophan Synthase
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Simultaneous Quantification of Selected Kynurenines Analyzed by Liquid Chromatography-Mass Spectrometry in Medium Collected from Cancer Cell Cultures
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Area of Science:

  • Biochemistry
  • Physiology
  • Medical Science

Background:

  • Tryptophan is essential, with rapid depletion in catabolic states.
  • Serotonin and kynurenine pathways are crucial in critically ill patients.
  • Tryptophan metabolites influence neurotransmission, circadian rhythms, and inflammation.

Purpose of the Study:

  • To review the roles of tryptophan metabolism in critical illness.
  • To highlight the significance of serotonin and kynurenine pathways.
  • To explore therapeutic potential in age-related diseases and post-intensive care syndrome.

Main Methods:

  • Literature review of tryptophan metabolism.
  • Analysis of serotonin and kynurenine pathway functions.
  • Examination of clinical implications in critical care.

Main Results:

  • Increased kynurenine levels and ratios indicate early sepsis.
  • Tryptophan metabolites affect skeletal muscle mass and polyneuromyopathy.
  • Dysregulated tryptophan metabolism contributes to cognitive, physical, and mental impairments.

Conclusions:

  • Modulating tryptophan metabolism offers a potential therapeutic strategy.
  • Interventions could target chronic inflammation and post-intensive care syndrome.
  • Understanding these pathways is key for managing critical illness complications.