Activity-Based Protein Profiling of Bacterial Monooxygenases

Area of Science:

• Biochemistry
• Proteomics
• Environmental Microbiology

Background:

• Bacterial monooxygenases are crucial for biogeochemical cycles.
• Some monooxygenases, like ammonia monooxygenase (AMO), are challenging to characterize using traditional purification methods.
• Activity-based protein profiling (ABPP) provides a powerful alternative for studying enzyme activity.

Purpose of the Study:

• To present a novel 2-step ABPP method for characterizing bacterial monooxygenases.
• To focus on SDS-PAGE-based detection of fluorescently labeled monooxygenase components.
• To highlight factors influencing ABPP for monooxygenase quantification and cellular localization.

Main Methods:

• Developed and applied a 2-step activity-based protein profiling (ABPP) strategy.
• Utilized SDS-PAGE for the detection of fluorescently labeled monooxygenase proteins.
• Investigated features impacting quantification and cellular detection of target enzymes.

Main Results:

• Successfully characterized ammonia monooxygenase (AMO) and other bacterial monooxygenases using the developed ABPP method.
• Demonstrated the utility of SDS-PAGE for visualizing activity-based labeled enzyme components.
• Identified key analytical considerations for quantitative ABPP of monooxygenases.

Conclusions:

• The described 2-step ABPP method is effective for characterizing bacterial monooxygenases, including AMO.
• SDS-PAGE-based detection is a viable approach for analyzing activity-labeled enzymes.
• This ABPP approach enhances the study of enzymes vital to biogeochemical processes.