Reverse stable isotope labelling with Raman spectroscopy for microbial proteomics

Area of Science:

• Microbiology
• Biotechnology
• Spectroscopy

Background:

• Microbial proteome dynamics are crucial for bioprocesses and metabolite production.
• Current proteome monitoring methods are destructive and can be costly.
• Stable Isotope Probing (SIP) with Raman spectroscopy is a newer, but not always cost-effective, proteome analysis approach.

Purpose of the Study:

• To develop a novel, non-destructive, and cost-effective method for monitoring microbial proteome changes.
• To combine reverse SIP with Raman spectroscopy for enhanced proteome analysis.
• To assess the feasibility of using Raman spectroscopy for real-time proteome dynamics monitoring.

Main Methods:

• Developed a novel method combining reverse SIP using 13C-glucose and Deuterium.
• Utilized Raman spectroscopy to detect proteome changes.
• Applied the method to monitor proteome dynamics in microbial cultures.

Main Results:

• Demonstrated visible spectral changes (blue shifts) in proteome-related peaks.
• Successfully monitored proteome dynamics, including nascent amino acid synthesis and turnover.
• Validated the non-destructive, cost-effective, and label-free nature of the method.

Conclusions:

• The novel reverse SIP-Raman spectroscopy method enables non-destructive, cost-effective monitoring of microbial proteome dynamics.
• This approach offers a valuable tool for optimizing bioprocesses and understanding microbial responses.
• The technique facilitates real-time insights into amino acid metabolism and protein turnover.