Metabolic Pathway Confirmation and Discovery Through <sup>13</sup>C-labeling of Proteinogenic Amino Acids

Le You; Lawrence Page; Xueyang Feng; Bert Berla; Himadri B. Pakrasi; Yinjie J. Tang

doi:10.3791/3583

Metabolic Pathway Confirmation and Discovery Through 13C-labeling of Proteinogenic Ami...

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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

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07:26 min

January 26, 2012

DOI: 10.3791/3583-v

Le You¹, Lawrence Page², Xueyang Feng¹, Bert Berla¹, Himadri B. Pakrasi³, Yinjie J. Tang¹

¹Department of Energy, Environmental and Chemical Engineering,Washington University, ²Department of Biology,Washington University, ³Department of Energy, Environmental and Chemical Engineering and Department of Biology,Washington University

Overview

This protocol focuses on studying bacterial metabolism through carbon-13 assisted metabolism analysis. By culturing microbes with labeled carbon substrates, researchers can trace metabolic pathways based on the incorporation of these substrates into microbial proteins.

Key Study Components

Area of Science

Microbial Metabolism
Isotope Labeling Techniques
Gas Chromatography-Mass Spectrometry (GC-MS)

Background

Carbon-13 isotope labeling helps in understanding metabolic processes.
Microbes utilize specific substrates for growth and metabolism.
GC-MS is a powerful tool for analyzing metabolic pathways.
Tracing atom transitions can reveal insights into biochemical networks.

Purpose of Study

To analyze the metabolic pathways of bacteria.
To utilize carbon-13 labeled substrates for tracing metabolism.
To enhance understanding of microbial protein synthesis.

Methods Used

Culture microbes in the presence of labeled carbon substrates.
Harvest microbes and extract amino acids.
Hydrolyze and derivatize amino acids for analysis.
Apply samples to GC-MS for metabolic pathway analysis.

Main Results

Identification of unique labeling patterns in amino acids.
Reconstruction of functional metabolic pathways.
Insights into the metabolic mechanisms of the studied microbes.

Conclusions

Carbon-13 isotope labeling is effective for studying microbial metabolism.
GC-MS provides detailed insights into metabolic pathways.
This method can be applied to various types of microorganisms.

Frequently Asked Questions

What is carbon-13 isotope labeling?

Carbon-13 isotope labeling is a technique used to trace metabolic pathways by incorporating a stable isotope of carbon into substrates.

How does GC-MS work in metabolic analysis?

GC-MS separates and identifies compounds in a sample, allowing researchers to analyze metabolic products and pathways.

What types of microorganisms can be studied using this method?

This method can be applied to various types of microorganisms, including bacteria and fungi.

What are the benefits of using labeled substrates?

Labeled substrates allow for the tracking of metabolic processes and provide insights into the utilization of different carbon sources.

Can this technique be used for other biological studies?

Yes, carbon-13 labeling can be adapted for various studies in metabolic research across different organisms.

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.

The goal of this protocol is to study bacterial metabolism using carbon 13 assisted metabolism analysis. To begin, microbes are grown in the presence of labeled carbon substrates, which are incorporated into the microbial proteins. The microbes are then harvested and amino acids are extracted, hydrolyzed and derivatized.

The samples are applied to a gas chromatograph and mass spectrometer or GCMS. By tracing the atom transition paths between metabolites in the biochemical network, the functional metabolic pathways utilized by the microbe can be determined. I'm Bert Burla.

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