Abstract
Nonribosomal peptide synthetases, consisted of multiple catalytic domains, are involved in the biosynthesis of an important family of bioactive natural products in a coordinated manner. Among the functional domains, adenylation domains are specifically responsible for recognizing carboxylic acid building blocks and synthesizing aminoacyl adenylates. Given their critical roles in the biosynthesis of the growing peptide, A-domains are also referred to as the “gatekeeper”. In this review, very recent developments on the A-domains from NRPSs are reviewed to expand the fundamental knowledge of the A domain, including knowledge on the structures, functions, and molecular interactions. Several recent examples were also discussed to highlight the great potential of A-domain engineering. This study should provide a framework for the combinatorial biosynthesis or synthetic biology-driven microbial production of novel nonribosomal peptides.
Graphical Abstract
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