Summary

Biosynthesis and synthetic biology explore the enzymatic formation of biological molecules and the design, engineering, and reconstruction of biological systems. This collection covers biosynthetic pathways, enzyme-mediated reactions, metabolic engineering, genetic circuits, engineered microorganisms, cellular factories, genome editing, and the production of valuable compounds through programmable biological processes.

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Alkaloid Biosynthesis
Alkaloid biosynthesis is the genetically encoded, enzyme-mediated formation of alkaloids: nitrogen-containing natural products produced through specialized metabolic pathways. It encompasses the conversion of central-metabolic precursors into alkaloid core structures and the subsequent reactions that generate structurally distinct alkaloid products. Alkaloid-producing bacteria, fungi, and plants possess different pathway architectures and enzyme repertoires; consequently, alkaloid classes do not necessarily share a single precursor, sequence of intermediates, or biosynthetic mechanism [1]. In established plant pathways, amino acids and their derivatives commonly provide carbon and nitrogen inputs for the formation of alkaloid frameworks [2]. Biosynthesis includes scaffold-forming transformations and downstream tailoring reactions, such as oxidation, reduction, methylation, acylation, and glycosylation, which alter the molecular structure of pathway intermediates [1][3]. The term denotes endogenous biological production and its associated enzymes and genes; it excludes laboratory chemical synthesis, semisynthesis, extraction, isolation, and structural analysis of alkaloids.
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