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Metabolic Pathway Confirmation and Discovery Through 13C-labeling of Proteinogenic Amino Acids

Metabolic Pathway Confirmation and Discovery Through ¹³C-labeling of Proteinogenic Amino Acids

Published on: January 26, 2012

(13)C-based metabolic flux analysis.

Nicola Zamboni¹, Sarah-Maria Fendt, Martin Rühl

¹Institute of Molecular Systems Biology, ETH Zurich, Zurich, Switzerland.

Nature Protocols

|May 30, 2009

Summary

This summary is machine-generated.

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This study presents a robust protocol for quantifying metabolic network responses using carbon-13 (13C)-labeled glucose and mass spectrometry. This method enables accurate flux analysis in microbial systems with minimal equipment.

Area of Science:

Metabolic Engineering
Systems Biology
Biotechnology

Background:

Stable isotope labeling, particularly using carbon-13 ((13)C), is essential for experimentally determining metabolic network responses.
Quantifying metabolic fluxes provides critical insights into cellular metabolism and pathway regulation.

Purpose of the Study:

To describe a practical protocol for (13)C-based metabolic flux analysis.
To enable the estimation of metabolic pathway fluxes using accessible analytical techniques.

Main Methods:

Microbial cultivation on (13)C-labeled glucose.
Gas chromatography-mass spectrometry (GC-MS) for detecting (13)C-labeling patterns in protein-bound amino acids.
Application of publicly available software for mathematical modeling to estimate flux ratios and absolute fluxes.

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Last Updated: Jun 22, 2026

Metabolic Pathway Confirmation and Discovery Through 13C-labeling of Proteinogenic Amino Acids

Metabolic Pathway Confirmation and Discovery Through ¹³C-labeling of Proteinogenic Amino Acids

Published on: January 26, 2012

Metabolic Analysis of Drosophila melanogaster Larval and Adult Brains

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Main Results:

The protocol allows for the quantification of metabolic fluxes by analyzing (13)C incorporation into amino acids.
Two complementary mathematical approaches are presented for flux estimation.
The method is demonstrated for the central metabolism of Escherichia coli.

Conclusions:

This (13)C-labeling protocol offers a reliable and accessible method for metabolic flux analysis in microbes.
It requires minimal equipment and analytical expertise compared to other methods like dynamic flux analysis.
The protocol has been extensively validated and applied over the past decade.