Nitrogen Metabolic Labeling
Nitrogen Metabolic Labeling - Related Videos
08:28
Metabolic Labeling
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2023
Metabolic labeling is used to probe the biochemical transformations and modifications that occur in a cell. This is accomplished by using chemical analogs that mimic the structure of natural biomolecules. Cells utilize analogs in their endogenous biochemical processes, producing compounds that are labeled. The label allows for the incorporation of detection and affinity tags, which can then be used to elucidate metabolic pathways using other biochemical analytical techniques, such as SDS-PAGE...
01:20
Overview of Nitrogen Metabolism
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2023
Nitrogen is a very important element for life because it is a major constituent of proteins and nucleic acids. It is a macronutrient, and in nature, it is recycled from organic compounds and stored in the form of ammonia, ammonium ions, nitrate, nitrite, or nitrogen gas by many metabolic processes. Many of these metabolic processes are carried out only by prokaryotes. The largest pool of nitrogen available in the terrestrial ecosystem is gaseous nitrogen (N2) from the air, but this nitrogen...
06:46
Metabolic Labeling of the Nascent Transcriptome in Xenopus Early Embryogenesis
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2026
We provide detailed methods to metabolically label and purify nascent transcripts for transcriptome analysis in Xenopus early embryos using 5-ethynyl-uridine (5-EU).
10:16
Design and Operation of a Continuous 13C and 15N Labeling Chamber for Uniform or Differential, Metabolic and Structural, Plant Isotope Labeling
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Cited by 39 •
2014
This method explains how to build and operate a continuous 13C and 15N isotope labeling chamber for uniform or differential plant tissue labeling. Representative results from metabolic and structural labeling of Andropogon gerardii are discussed.
07:26
Metabolic Pathway Confirmation and Discovery Through 13C-labeling of Proteinogenic Amino Acids
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Cited by 53 •
2012
13C-isotope labeling is a useful technique for determining the cell central metabolism for various types of microorganisms. After cells have been cultured with a specific labeled substrate, GC-MS measurement can reveal functional metabolic pathways based on unique labeling patterns in proteinogenic amino acids.
FAQs
Stable-isotope enrichment gives nitrogen atoms a trackable signature within the measured molecules. When enriched nitrogen is supplied, that signature can be followed as nitrogen enters amino acids, proteins, nucleotides, and other metabolites. Comparing labeled and unlabeled molecular pools therefore shows where nitrogen is incorporated, rather than merely measuring total nitrogen.
Enrichment patterns can distinguish whether supplied nitrogen is taken up, incorporated into cellular molecules, returned to usable pools, or distributed among different metabolic destinations. Examining amino acids, proteins, nucleotides, and other metabolites helps connect those stages. The resulting picture describes how a cell, tissue, or organism manages nitrogen rather than treating metabolism as a single reaction.
Researchers can provide cells, tissues, or organisms with nitrogen-containing compounds enriched in ^15N. The compound chosen establishes the entry point for tracing nitrogen through the system, while the observed destinations show subsequent incorporation into molecular classes. This makes it possible to relate the starting nutrient input to pathway use and nitrogen allocation.
After biological material receives the enriched compound, researchers analyze molecules with mass spectrometry or nuclear magnetic resonance. These methods detect the isotope-associated signal in amino acids, proteins, nucleotides, and metabolites. Their use converts labeling into molecular evidence that nitrogen has moved through particular cellular products and pathways.
At a basic level, the workflow begins by exposing cells, tissues, or organisms to a nitrogen-containing compound enriched in ^15N. Researchers then examine the resulting biological molecules with mass spectrometry or nuclear magnetic resonance, asking where the label appears. Interpretation focuses on nitrogen uptake, assimilation, recycling, and allocation across molecular and metabolic contexts.
It is useful when the research question concerns how biological systems use nitrogen, including microbial or plant metabolism, nutrient use, protein turnover, or disease-related metabolic changes. The approach can connect molecular labeling patterns with broader physiological outcomes, helping explain not only which compounds contain nitrogen, but how nitrogen use relates to system-level biology.