High-resolution ¹³C metabolic flux analysis

Area of Science:

• Metabolic Engineering and Systems Biology
• Biotechnology and Microbiology

Background:

• Precise quantification of metabolic pathway fluxes is crucial for metabolic engineering, biotechnology, and human health.
• 13C metabolic flux analysis (13C-MFA) is the primary technique for determining intracellular fluxes.

Purpose of the Study:

• To present an optimized protocol for 13C-MFA incorporating recent advancements.
• To improve the precision and efficiency of intracellular flux quantification.

Main Methods:

• Utilizes parallel 13C-labeled glucose tracer experiments in microbial cultures.
• Employs gas chromatography-mass spectrometry (GC-MS) for isotopic labeling measurements of amino acids, glucose, and ribose.
• Integrates advanced statistical analysis and specialized software (e.g., Metran) for flux estimation.

Main Results:

• The protocol can be completed in 4 days with a standard deviation of ≤2% for quantified metabolic fluxes.
• Demonstrates a substantial improvement in precision compared to previous 13C-MFA implementations.
• Provides a case study using Escherichia coli ΔtpiA with comprehensive data and troubleshooting guidance.

Conclusions:

• The presented 13C-MFA protocol offers a highly precise and efficient method for metabolic flux quantification.
• The protocol is adaptable for both prokaryotic and eukaryotic systems.
• This optimized approach facilitates advancements in various biological and medical fields.