Abstract
Emerging microorganism Pseudomonas putida KT2440 is utilized for the synthesis of biobased chemicals from renewable feedstocks and for bioremediation. However, the methods for analyzing, engineering, and regulating the biosynthetic enzymes and protein complexes in this organism remain underdeveloped.Such attempts can be advanced by the genetic code expansion-enabled incorporation of noncanonical amino acids (ncAAs) into proteins, which also enables further controls over the strain's biological processes. Here, we give a step-by-step account of the incorporation of two ncAAs into any protein of interest (POI) in response to a UAG stop codon by two commonly used orthogonal archaeal tRNA synthetase and tRNA pairs. Using superfolder green fluorescent protein (sfGFP) as an example, this method lays down a solid foundation for future work to study and enhance the biological functions of KT2440.
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