Abstract
Nonribosomal peptide (NRP) natural products are among the most promising resources for drug discovery and development, owing to their wide range of biological activities and therapeutic applications. These peptide metabolites are biosynthesized by large multienzyme machinery known as NRP synthetases (NRPSs). The structural complexity of a number of NRPs poses an enormous challenge in their synthesis. A major issue in this field is reprogramming NRPS machineries to allow the biosynthetic production of artificial peptides. NRPS adenylation (A) domains are responsible for the incorporation of a wide variety of amino acids and can be considered as reprogramming sites; therefore, advanced methods to accelerate the functional prediction and assessment of A-domains are required. This Concept article demonstrates that activity-based protein profiling of NRPSs offers a simple, rapid, and robust analytical platform for A-domains and provides insights into enzyme-substrate candidates and active-site microenvironments. It also describes the background associated with the development and application of a method to analyze endogenous NRPS machinery in its natural environment.
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